Development & Certification

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DIMO Open Hardware Specification

The DIMO Open Hardware Spec is designed to guide manufacturers and device integrators in ensuring that their hardware is compatible with the DIMO platform.

DIMO OPEN HARDWARE SPECIFICATION REV N/C December 19 2022

Overview

The DIMO Open Hardware Specification is a critical component of the Open Hardware Ecosystem. Prospective manufacturers of DIMO-compatible devices are expected to adhere to the below specifications for all aspects of the device’s design. Auditing a device and confirming if the materials, components and design adhere to the below spec is a major aspect approval process for a DIMO-compatible device.

Engineers and designers are encouraged to contact DIMO or the DIMO Foundation if any questions arise regarding the below specifications.

Hardware Requirements

WiFi

WiFi Requirements

To be DIMO-compatible, devices must meet the following specifications:

• 802.11 b/g/n/ac/ax compatibility: This ensures that the device can connect to modern WiFi networks and communicate with other devices using the latest WiFi standards.

• 2.4 GHz and 5 GHz frequency support: This allows the device to operate on both the 2.4 GHz and 5 GHz frequency bands, which are commonly used by IoT devices.

• WPA2/WPA3 security protocol support: This ensures that the device can securely connect to and communicate over WiFi networks, using the latest security protocols.

• Minimum 100 Mbps transfer speed: This ensures that the device can transmit and receive data quickly and efficiently over the network.

• Small form factor antenna: This allows the device to be compact and portable, while still maintaining a strong and reliable wireless connection. The antenna can be internal or external.

• Strong signal strength: In addition to having a small form factor antenna, the device should be able to maintain a strong and reliable signal over a reasonable distance. At a distance of 20 feet, the device should have a minimum SNR of 20 dB and a minimum SSI of -70 dBm. This will ensure that the device can effectively communicate with other devices on the network.

WiFi Spec Table

WiFi	802.11 b/g/n/ac/ax compatibility
Frequency	2.4 GHz, 5 GHz
Security	WPA2/WPA3 support
Transfer speed	Minimum 50 Mbps
Antenna	Small form factor, internal or external
Signal strength	Minimum SNR of 20 dB and SSI of -70 dBm at a distance of 20 feet
Tx power	The specific TX power required will depend on the regulatory requirements of the region where the device will be used. In the US, for example, the maximum allowable TX power for 2.4 GHz WiFi devices is 18 dBm.

CAN

CAN Requirements

DIMO-compatible devices with CAN capability must adhere to the following:

• Error detection and correction: A robust CAN bus interface must be able to detect and correct errors in the data transmission, in order to maintain the integrity of the data. For example, the interface may have an error detection rate of at least 95%, and an error correction rate of at least 90%.

• High data rate: A robust CAN bus interface must be able to support high data rates, in order to transfer large amounts of data quickly and efficiently. For example, the interface may have a data rate of at least 1 Mbps. The maximum length of a CAN message is 8 bytes for standard messages and 64 bytes for extended messages.

• Fault tolerance: A robust CAN bus interface must be able to tolerate faults, such as short circuits or open circuits, without affecting the operation of the bus.

• High noise immunity: The CAN bus interface must be able to operate reliably in the presence of electromagnetic interference, in order to maintain the integrity of the data transmission. The Interface may have a noise immunity of at least 30 V/m.

• The physical layer for the CAN devices must use differential signaling with a signaling voltage of 2.5V. The maximum bus length must not exceed 5 meters, and the maximum number of nodes on the bus is 128.

• Compliance with relevant standards: The CAN bus interface must comply with relevant standards, such as ISO 11898 and SAE J1939, which specify requirements for the design and performance of CAN bus interfaces in automotive applications. For example, the interface may be designed to meet the requirements of ISO 11898 and SAE J1939.

• Automotive grade CAN devices for CAN controllers and a CAN transceivers. They must also have additional features, such as support for fault-tolerant systems and fail-safe mechanisms.

CAN Spec Table

Error detection and correction	Error detection rate of at least 95%, error correction rate of at least 90%
Data rate	Data rate of at least 1 Mbps, maximum message length of 8 bytes (standard) or 64 bytes (extended)
Fault tolerance	Tolerance to faults such as short circuits or open circuits without affecting bus operation
High noise immunity	Noise immunity of at least 30 V/m
Physical layer	Differential signaling with 2.5V signaling voltage
Bus length	Maximum length of 5 meters
Number of nodes	Maximum of 128 nodes
Compliance with standards	ISO 11898 and SAE J1939 compliance
Additional features	Support for fault-tolerant systems and fail-safe mechanisms

Bluetooth

Bluetooth Requirements

To be DIMO-compatible with Bluetooth enabled, devices must meet the following specifications:

• Bluetooth 5.0 or later compatibility: Ensures that the device can connect to and communicate with other Bluetooth devices using the latest Bluetooth standard. Previous Bluetooth standards are not supported.

• Low Energy (BLE) support: Allows the device to use Bluetooth LE for low-power communication with other devices.

• At least 1 Mbps transfer speed: Ensures that the device can transmit and receive data quickly and efficiently over Bluetooth.

• Secure Simple Pairing (SSP) support for below Bluetooth 5.2. : Ensures that the device can securely connect to and communicate with other Bluetooth devices using SSP.

• Small form factor antenna, internal or external: Allows the device to be compact and portable, while still maintaining a strong and reliable Bluetooth connection.

• Low power consumption for battery-powered devices: Ensures that the device can operate efficiently and for an extended period of time on battery power.

• Strong signal strength for reliable communication over a 10-foot range: Ensures that the device can maintain a strong and reliable Bluetooth signal over a distance of 10 feet. Refer to SIG standards https://www.bluetooth.com/specifications/specs/

• TX power of 18 dBm or lower for compliance with regulatory requirements: Ensures that the device complies with regulatory requirements for Bluetooth transmission power. Refer to SIG standards https://www.bluetooth.com/specifications/specs/

• Support for Bluetooth profiles such as HFP, HSP, A2DP, and AVRCP: Ensures that the device can connect to and communicate with a range of devices and applications using common Bluetooth profiles. Refer to SIG standards https://www.bluetooth.com/specifications/specs/

Bluetooth Spec Table

Bluetooth	5.2 or later compatibility
Energy	Low Energy (LE) support
Data rate	Enhanced Data Rate (EDR) support
Transfer speed	At least 1 Mbps
Security	Secure Simple Pairing (SSP) support
Antenna	Small form factor, internal or external
Power consumption	Low power for battery-powered devices
Signal strength	Minimum SNR of 20 dB and SSI of -70 dBm at a distance of 10 feet
TX power	18 dBm or lower
Bluetooth profiles	HFP, HSP, A2DP, and AVRCP support

NFC

NFC Requirements

NFC designed in a DIMO-compatible device must comply with the following:

• The NFC device operates at the 13.56 MHz frequency and is compatible with the ISO/IEC 14443 and ISO/IEC 15693 standards, which are commonly used in NFC systems.

• The NFC device supports the NFC Forum Type 2 and Type 4 tags, which are standardized NFC tag types used for a variety of applications.

• The NFC device has a transfer speed of at least 212 kbps, which is the minimum speed required for fast and efficient data transfer over NFC.

• The NFC device supports the FeliCa and MIFARE protocols, which are widely used in NFC systems for various applications such as access control and payment.

• The NFC device has a small form factor internal NFC antenna, which allows it to be easily integrated into a variety of devices with limited space.

• The NFC device has low power consumption, making it suitable for use in battery-powered devices.

• The NFC device has strong signal strength*️, ensuring reliable communication over a reasonable distance.

• The NFC device supports NFC-based security protocols such as WPA2-Enterprise and FIDO U2F, which provide additional security measures to protect against unauthorized access.

Developer Notes

*️ The signal strength values for SNR (Signal-to-Noise Ratio) and SSI (Signal Strength Indicator) in NFC are measured in decibels (dB). The specific values can vary depending on the specific NFC standard, the type of NFC tags being used, and the distance between the NFC reader and the NFC tags.

For NFC devices operating at the 13.56 MHz frequency and compliant with the ISO/IEC 14443 and ISO/IEC 15693 standards, the following signal strength values may be used as a general reference:

• SNR: -20 dB to -30 dB

• SSI: -70 dBm to -80 dBm

Keep in mind that these are just general reference values and the actual signal strength values may vary depending on the specific NFC system and configuration. It is also important to note that the signal strength values for SNR and SSI are not directly comparable, as they measure different aspects of the NFC signal.

SNR measures the ratio of the NFC signal to the noise level in the system, while SSI measures the power of the NFC signal. A higher SNR value indicates a stronger signal with less noise, while a higher SSI value indicates a stronger signal. In general, higher SNR and SSI values are desirable for reliable NFC communication.

NFC Spec Table

Operating frequency	13.56 MHz
Compatible standards	ISO/IEC 14443, ISO/IEC 15693
Supported tag types	NFC Forum Type 2, Type 4
Data transfer rate	212 kbps or higher
Supported protocols	FeliCa, MIFARE
Antenna	Small form factor internal NFC antenna
Power consumption	Low power consumption
Signal strength	Strong signal strength (SNR: -20 dB to -30 dB, SSI: -70 dBm to -80 dBm)
Security protocols	WPA2-Enterprise, FIDO U2F

USB

USB Requirements

DIMO-compatible IoT Hardware Device specification using USB:

• All USB connectors must be USB-C type and protected against ESD (electrostatic discharge).

• Durability: The device must be able to withstand rough handling and extreme environmental conditions (such as temperature, humidity, and vibration).

• Charging capacity: The device must be able to charge efficiently and quickly, with a maximum charging speed of 3.0A. Any additional USB charging specifications are not a requirement.

• Data speeds: The device must support data transfer speeds of at least USB 2.0 standard (480Mbps).

• Compatibility: The device must be compatible with a wide range of operating systems, including but not limited to Windows, MacOS, Linux, and Android.

• Security: The device must implement secure data transfer and storage, including encryption and authentication measures.

• Ease of use: The device must be user-friendly, with a clear and intuitive interface.

• Voltage: The voltage of any USB ports must be 5.0V +/- 5% according to USB specifications.

• Certifications: The device must meet all relevant industry certifications and standards, including FCC and CE.

• USB cables: All included USB cables must be shielded, of high quality, and be USB 3.2 compatible (even if only for charging, the cable must be capable of data transmission to a USB 3.2 standard).

LoRaWAN

LoRaWAN Requirements

This specification outlines the requirements for DIMO compatible LoRaWAN devices that operate on the Helium network and other networks.

• Region-based frequency support: DIMO compatible LoRaWAN devices should support specific frequencies based on the region they are deployed in (see spec table).

• Data Transfer Rate: DIMO-compatible LoRaWAN devices should support a minimum data transfer rate as listed (see spec table). Higher rates may be supported depending on the specific device and the network it is connected to.

• Protocol support: DIMO-compatible LoRaWAN devices should support the LoRaWAN protocol, as well as any additional requirements by the intended network.

• Antenna requirements: Antenna requirements for DIMO compatible LoRaWAN devices may vary depending on the specific device and its intended use, but generally an internal antenna is preferred for compact devices and an external antenna is preferred for devices with larger coverage requirements.

• Low power consumption: Power consumption for DIMO compatible LoRaWAN devices should be as low as possible.

• Signal strength: Compatible LoRaWAN devices should have a minimum signal-to-noise ratio (SNR) of around -6 dB and a minimum signal strength indicator (SSI) of around -105 dBm in order to ensure reliable communication.

LoRaWAN Spec Table

Frequency	North America: 902-928 MHz Europe: 862-870 MHz China: 470-510 MHz Australia: 915-928 MHz
Data Transfer Rate	Minimum of 0.3 kbps
Protocols	LoRaWAN, additional protocols may be required by the network
Antenna Requirements	Internal antenna preferred for compact devices, external antenna preferred for larger coverage requirements
Power Consumption	Maximum of 1.5 mW in sleep mode 100 mW in active mode
Signal Strength	Minimum SNR of -6 dB, minimum SSI of -105 dBm

OBD-II

OBD-II Protocol Requirements

All DIMO-compatible OBD-II devices must comply with the ISO 15765 standard for communication over the Controller Area Network (CAN) bus. This includes complying with the following standards:

Standard	Definition
J1962	Defines the physical connector used for the OBD-II interface.
J1850	Defines a serial data protocol.
J1978	Defines minimal operating standards for OBD-II scan tools.
J1979	Defines standards for diagnostic test modes.
J2012	Defines standards trouble codes and definitions.
J2178-1	Network message header formats and physical address assignments.
J2178-2	Gives data parameter definitions.
J2178-3	Defines standards for network message frame IDs for single byte headers.
J2178-4	Defines standards for network messages with three byte headers.
J2284-3	Defines 500K CAN physical and data link layer.
J2411	Describes the GMLAN (Single-Wire CAN) protocol, used in newer GM vehicles.

In addition to ISO 15765, it is strongly encouraged that DIMO-compatible devices also support the following protocols:

• ISO 14230-4 (KWP2000): The Keyword Protocol 2000 is commonly used in 2003+ cars in Asia and other regions.

• ISO 9141-2: This protocol is used in EU, Chrysler, and Asian cars from 2000-2004.

• SAE J1850 (VPW): This protocol is primarily used in older GM vehicles.

• SAE J1850 (PWM): This protocol is primarily used in older Ford vehicles.

OBD-II Pinout

Here is a list of the OBD-II pinout and a brief description of each pin:

Pinout	Description
1	Manufacturer discretion
2	Bus positive line of SAE J1850 PWM and VPW
3	Manufacturer discretion
4	Chassis ground
5	Signal ground
6	CAN high (ISO 15765-4 and SAE J2284)
7	K-line of ISO 9141-2 and ISO 14230-4
8	Manufacturer discretion
9	Manufacturer discretion
10	Bus negative line of SAE J1850 PWM only (not SAE 1850 VPW)
11	Manufacturer discretion
12	Not connected
13	Manufacturer discretion
14	CAN low (ISO 15765-4 and SAE J2284)
15	L-line of ISO 9141-2 and ISO 14230-4
16	Battery power (supplied when ignition is off)

Developer Notes

It's important to note that not all OBD-II connectors will have all of these pins, as the pinout can vary depending on the specific communication protocol being used. Additionally, some manufacturers may have their own proprietary protocols that use different pins.

5G/LTE

For DIMO compatible devices, LTE/5G communication must comply with all relevant regional laws and certification standards. This includes, but is not limited to, standards such as 3GPP Release 8, 9, 10, 11, 12, 13, 14, 15, 16, and any additional standards required by the specific region in which the device will be used.

In addition to complying with regional laws and certification standards, DIMO compatible devices should also support multi-carrier IoT network providers and SIMs. This allows for greater flexibility and increased reliability, as a vehicle may need to connect to multiple carriers and networks if necessary on a single trip.

Support for multi-carrier IoT network providers and SIMs also allows for easier deployment and management of the device, as it can be used with multiple carriers and networks without the need for additional hardware or software modifications. This can save time and cost in the deployment and management of the device, and can increase its overall reliability and uptime.

Overall, the support for multi-carrier IoT network providers and SIMs is an important specification for DIMO compatible devices, as it ensures that the device can be used effectively in a variety of different regions and environments.

LTE/5G INTERNAL ANTENNA

The LTE/5G internal antenna requirements for the US and Europe may include the following:

• Frequency range: The antenna should be designed to operate over the relevant frequency bands for LTE/5G in the region that the device will be deployed.

• Gain and efficiency: The antenna should provide a sufficient gain and efficiency to ensure reliable communication and support the required data rates for LTE/5G. This may vary depending on the specific frequency bands and operating conditions. \

• Size and form factor: The antenna should be compact and have a suitable form factor for integration into the device. This may require careful consideration of the antenna geometry, materials, and placement within the device if the antenna is custom for the device.

• Compatibility with other wireless technologies: The antenna should be compatible with other wireless technologies, such as WiFi and Bluetooth, to avoid interference and ensure coexistence with other wireless devices.

• Compliance with regulatory standards: The antenna should meet the relevant regulatory standards, such as FCC Part 15 and ETSI EN 301 489, to ensure compliance with the legal requirements for wireless devices in the US and Europe.

Overall, the LTE/5G internal antenna requirements should balance performance, size, compatibility, and compliance to support reliable and efficient communication in these regions. For other regions, please consult the DIMO Foundation.

GNSS

The DIMO GPS receiver specification is intended to guide manufacturers in designing IoT devices with GPS capabilities. It is important for manufacturers to ensure that their devices comply with regional requirements in order to ensure that they can be used in different parts of the world.

For the US, the following requirements must be met:

• A GPS receiver must be able to receive signals from at least four GPS satellites simultaneously. This is necessary in order to provide accurate positioning information.

• The receiver must be able to receive signals from the L1 and L2 frequency bands. These are the frequencies used by GPS satellites, and a receiver must be able to receive signals from both in order to provide accurate positioning information.

• The receiver must be able to receive signals at a minimum strength of -130 dBm. This is necessary in order to ensure that the receiver can function properly in a variety of environments.

• Relevant standards for GPS devices in the US include ISO 17123-1, ANSI C63.4, and FCC Part 15. Manufacturers must ensure that their devices comply with these standards in order to be used in the US.

If a manufacturer is designing a device for a region outside of the US, it is recommended that they consult the DIMO foundation for further guidance on regional requirements.

Display

This is a specification for DIMO-compatible hardware devices that utilize displays that are capable of outdoor use and are specifically designed for automotive purposes. Only OLED and paperwhite display types are permitted on DIMO-compatible devices.

OLED displays

• Resolution: 1080p (Full HD) or higher

• Aspect ratio: 16:9 or higher

• Refresh rate: 60 Hz or higher

• Brightness: 500 nits or higher

• Contrast ratio: 1000:1 or higher

• Durability: Resistant to sunlight, extreme temperatures, and moisture

• Touch: Capacitive touch only

• Drop testing: meets or exceeds automotive industry standards (e.g. SAE J1211)

• Automotive specifications: meets or exceeds relevant automotive industry standards (e.g. SAE J1455, SAE J1292)

Paperwhite/E-Ink displays

• Resolution: 300 dpi or higher

• Aspect ratio: 4:3 or higher

• Refresh rate: N/A (static display)

• Brightness: 300 nits or higher

• Contrast ratio: N/A (static display)

• Durability: resistant to sunlight, extreme temperatures, and moisture

• Touch: capacitive touch only

• Drop testing: meets or exceeds automotive industry standards (e.g. SAE J1211)

• Automotive specifications: meets or exceeds relevant automotive industry standards (e.g. SAE J1455, SAE J1292)

Developer Notes

The specifications listed above for displays are general guidelines and may vary depending on the specific application and use case. It is important to carefully consider the needs and requirements of the device and the environment in which it will be used when selecting the appropriate display.

Camera

In-cabin Cameras

DIMO-compatible devices that utilize cameras for in-cabin use for dashcam, driver monitoring, rearview, or sentry mode must comply with the following requirements:

• Resolution: The camera should have a minimum resolution of 1080p (1920 x 1080 pixels) in order to capture clear and detailed images.

• Optical zoom: The camera should have a minimum optical zoom of 2x in order to allow for some flexibility in adjusting the focus and framing of the image.

• Autofocus: The camera should have a fast and reliable autofocus system in order to quickly and accurately adjust the focus of the image.

• Temperature: The camera should be able to operate within a temperature range of -40°C to 80°C (-40°F to 176°F) in order to function properly in a range of environmental conditions.

• Frame rate: The camera should have a minimum frame rate of 30 frames per second (fps) in order to capture smooth and fluid motion.

• Field of view: The camera should have a minimum field of view of 120 degrees in order to capture a wide area within the passenger compartment.

• Lens distortion: The camera should have minimal lens distortion in order to produce accurate and undistorted images.

• Image sensor: The camera should use a CMOS image sensor with a minimum pixel size of 2.8 micrometers in order to capture high-quality images.

• Infrared/night vision: The camera should have the capability to capture images in low light conditions and at night using infrared illumination.

• Shutter speed: The camera should have a minimum shutter speed of 1/30th of a second in order to freeze motion and reduce blur in images.

• Shutter type: The camera should use a rolling shutter in order to minimize motion blur and reduce power consumption.

In terms of automotive specifications, the camera should be able to withstand the vibrations and stresses of driving, and should be resistant to water, dust, and other environmental factors. It should also be able to operate at a wide range of voltages and have a low power consumption in order to be suitable for use in a vehicle. Some specific automotive specifications that may apply to in-cabin camera use include:

• SAE J1211: Covers the performance and testing of driver monitoring systems

• ISO 26262: Covers functional safety for road vehicles.

Overall, the camera should be able to capture high-quality images and video, with minimal distortion and noise, and be able to operate in a range of environmental conditions. It should also have a fast and reliable autofocus system, and be resistant to the stresses of driving and environmental factors, in order to be suitable for use in IoT devices in an automotive setting.

Processor

Microcontroller Requirements

DIMO requires automotive grade microcontrollers for DIMO-approved devices, and have the following technical requirements:

• AEC-Q100 qualification: The microcontroller should be qualified according to the Automotive Electronics Council (AEC) Q100 standard, which defines the quality and reliability requirements for automotive electronics. This standard covers a wide range of automotive applications, including engine control, powertrain control, and safety-critical systems.

• Temperature range: The microcontroller should be able to operate over a wide temperature range, typically from -40°C to +125°C, to ensure reliable performance in extreme environments.

• High-speed communication interfaces: The microcontroller should support high-speed communication interfaces, to enable efficient data transfer within the vehicle.

• Hardware security features: The microcontroller should include hardware security features, such as secure boot, to protect against unauthorized access and tampering.

• Robust packaging: The microcontroller should be packaged in a robust and durable package, such as a quad flat no-leads (QFN) or ball grid array (BGA), to withstand the mechanical and thermal stresses of the automotive environment.

Overall, automotive grade microcontrollers should meet the relevant industrial specifications and standards, such as AEC-Q100 and ISO 26262, to ensure reliability, safety, and performance in automotive applications.

Manufacturer of Processors or Microcontrollers

Manufacturer requirements for processors and micro-controllers used in DIMO-compatible devices:

• All processors and micro-controllers used in DIMO compatible devices must be authentic and from a reputable manufacturer. Proof of authenticity, such as a certificate or invoice, must be provided.

• Any processors or micro-controllers used must be automotive grade.

• Any processors or micro-controllers used must not be manufactured in China.

• All microcontrollers and processors used will be examined using a cat scan or electron microscope to ensure authenticity.

• In order for a DIMO-compatible device to be approved, sufficient quantity of parts must be available from the manufacturer.

• Any processors or micro-controllers that do not meet these specifications will not be approved for use in DIMO-compatible devices.

The following manufacturers are approved for use in DIMO compatible devices:

• Intel

• AMD

• ARM

• Microchip

• Atmel

• NXP

• Texas Instruments

• Renesas

• Nordic Semiconductors

• NVIDIA

• STM

• Infineon

• Onsemi

Audio

Developer Notes

🎵 In terms of automotive standards, the audio devices should comply with:

• ISO 10487, which specifies the general requirements for connectors for in-vehicle audio systems.

• ISO 7736, which specifies the general requirements for in-vehicle audio head units.

• SAE J553, which specifies the general requirements for in-vehicle audio amplifiers

• SAE J1850, which specifies the requirements for in-vehicle audio data buses.

Speakers and Buzzers

• Compact size: The speakers should be small enough to fit in the allotted space within the vehicle without causing any interference with other components.

• Noise level: The noise level of the speakers should be low enough to be inaudible to the occupants of the vehicle, with a noise level for buzzers even lower.

• Frequency range: The speakers should be able to reproduce frequencies from 20 Hz to 20,000 Hz (20 kHz) to provide a full and balanced sound.

Microphone

• Sensitivity: The microphone should have a sensitivity of at least -45 dBV/Pa.

• Size: The microphone should be small enough to fit in the allotted space within the vehicle without causing any interference with other components.

• Frequency range: The microphone should be able to accurately pick up frequencies from 50 Hz to 16,000 Hz (16 kHz) in order to capture the full range of speech and other sounds.

• Noise (electronic): The microphone should have an electronic noise level of less than 60 dBV.

• Sound pressure level wake-up (SPL): The microphone should be able to detect a sound

• Pressure level: At least 70 dB SPL in order to activate voice recognition or other features.

• I2S: The microphone should support the Inter-IC Sound (I2S) protocol for digital audio transmission.

Headphone Jack

• Durability: The headphone jack should be able to withstand at least 10,000 insertion and removal cycles.

• ESD protected: The headphone jack should be able to withstand an electrostatic discharge of at least 5 kV.

• Secure contact: The contact points within the headphone jack should have a retention force of at least 50 N.

• Connector type: The 3.5mm headphone jack should be the only accepted method for wired audio connection to ensure compatibility with a wide range of devices.

Sensors

Accelerometer

DIMO Check-in

🇺🇸 If you are located in a region outside of the United States, please consult the DIMO Foundation.

Accelerometer Requirements

DIMO-compatible devices with accelerometers must adhere to the following specifications:

• Measurement Range: This refers to the range of acceleration that the accelerometer is able to measure, typically specified in g's (units of gravitational acceleration). The measurement range of the accelerometer must be at least +/- 16g.

• Operating Temperature: This refers to the temperature range over which the accelerometer can operate correctly. It is typically specified in degrees Celsius. The operating temperature range of the accelerometer must be at least -40 to +125°C.

• Accelerometer Sensitivity: This refers to the output of the accelerometer per unit of acceleration. It is typically specified in mV/g or pC/g. A higher sensitivity value means that the accelerometer will produce a larger output signal for a given acceleration. The nonlinearity of the accelerometer must be no more than 1% of the full-scale range.

• Nonlinearity: This refers to the deviation of the accelerometer's output from a linear relationship with acceleration. It is typically specified as a percentage of the full-scale range. A lower nonlinearity value indicates better performance.

• Package Alignment Error: This refers to the error introduced by misalignment between the accelerometer package and the sensitive axis. It is typically specified in degrees and should be as low as possible. The package alignment error of the accelerometer must be no more than 0.5°.

• Orthogonal Alignment Error: This refers to the error introduced by misalignment between the sensitive axis of the accelerometer and the direction of acceleration. It is typically specified in degrees and should be as low as possible. The alignment error of the accelerometer must be no more than 0.5°.

• Cross-Axis Sensitivity: This refers to the sensitivity of the accelerometer to acceleration in a direction other than the sensitive axis. It is typically specified as a percentage of the sensitivity in the sensitive axis direction. A lower cross-axis sensitivity value indicates better performance. The cross-axis sensitivity of the accelerometer must be no more than 5% of the sensitivity in the sensitive axis direction.

• Zero-g Bias Level: This refers to the output of the accelerometer when it is not subjected to any acceleration. It is typically specified in mV or pC and should be as low as possible. The zero-g bias level of the accelerometer must be no more than 50 µV.

• Accelerometer Noise Density: This refers to the root mean square (RMS) value of the noise present in the accelerometer output, typically specified in µg/√Hz. A lower noise density value indicates better performance. The accelerometer noise density must be no more than 50 µg/√Hz.

• Total Noise: This refers to the RMS value of the total noise present in the accelerometer output, including both noise density and random noise. It is typically specified in µg and should be as low as possible. The total noise of the accelerometer must be no more than 250 µg.

• Compliance with relevant standards: An automotive-grade IMU must comply with relevant standards, such as ISO 26262 and SAE J3061, which specify requirements for the safety and performance of automotive electronics. For example, the IMU may be designed to meet the functional safety requirements of ISO 26262, with a failure rate of less than 1 FIT (failures in time).

Accelerometer Spec Table

Measurement Range	+/- 16g
Operating Temperature	-40 to +125°C
Accelerometer Sensitivity	1% of the full-scale range
Nonlinearity	< 1% of the full-scale range
Package Alignment Error	< 0.5°
Orthogonal Alignment Error	< 0.5°
Cross-Axis Sensitivity	< 5% of the sensitivity in the sensitive axis direction
Zero-g Bias Level	< 50 µV
Accelerometer Noise Density	< 50 µg/√Hz
Total Noise	< 250 µg
Compliance with Relevant Standards	ISO 26262, SAE J3061, with a failure rate of less than 1 FIT

Gyroscope

DIMO Check-in

🏎️ All gyroscopes used (either separate or integrated in an IMU) must be automotive grade.

Gyroscope Requirements

Here is a possible specification for a small electronic gyroscope integrated circuit for use in DIMO-compatible IoT devices with the appropriate values for an automotive grade gyroscope:

• Angular / Rotary Axes: 3-axis (X, Y, Z) - This specification refers to the number of rotational axes that the gyroscope can measure. In this case, the gyroscope is a 3-axis gyroscope, meaning it can measure rotational motion in 3 dimensions: the X axis, the Y axis, and the Z axis.

• Angular Rate Range: ±1000°/s - This specification refers to the range of angular rates that the gyroscope can measure. The angular rate is a measure of the speed at which an object is rotating around an axis, expressed in degrees per second (°/s). In this case, the gyroscope has an angular rate range of ±1000°/s, meaning it can measure angular rates from -1000°/s to +1000°/s.

• Linearity: ±1% - This specification refers to the accuracy with which the gyroscope can measure angular rate. Linearity is a measure of how closely the output of the gyroscope matches the input over a range of angular rates. In this case, the gyroscope has a linearity of ±1%, meaning that its output should be within 1% of the actual input over a range of angular rates.

• Angular Transverse Sensitivity: <0.01% - This specification refers to the sensitivity of the gyroscope to angular motion in a direction perpendicular to the axis of rotation. Angular transverse sensitivity is a measure of how much the output of the gyroscope is affected by angular motion in a direction other than the axis of rotation. In this case, the gyroscope has an angular transverse sensitivity of less than 0.01%, meaning that it is highly resistant to angular motion in directions other than the axis of rotation.

• Bias Stability: <0.005°/s - This specification refers to the stability of the gyroscope's zero-rate output, or "bias." The bias is the output of the gyroscope when it is not experiencing any angular motion. Bias stability is a measure of how stable the bias is over time. In this case, the gyroscope has a bias stability of less than 0.005°/s, meaning that the bias should remain stable and within a small range of values over time.

• Random Walk: <0.005°/s/√hr - This specification refers to the accuracy of the gyroscope over long periods of time. Random walk is a measure of how much the output of the gyroscope drifts over time due to random errors. In this case, the gyroscope has a random walk of less than 0.005°/s/√hr, meaning that the output should remain accurate over long periods of time despite the presence of random errors.

• Operating temperature range: The gyroscope should be able to operate within a temperature range that is suitable for the automotive environment, such as -40°C to +125°C.

• Shock and vibration resistance: The gyroscope should be able to withstand the shock and vibration typically encountered in an automotive environment.

• Rate-integrating Gyro: This specification refers to the type of gyroscope being used. A rate-integrating gyro is a type of gyroscope that integrates the angular rate over time to provide a measure of the angular displacement, or change in angle, of an object. In this case, the gyroscope is a rate-integrating gyro, meaning it can measure both angular rate and angular.

Gyroscope Spec Table

Anular/Rotary Axes	3-axis (X, Y, Z)
Angular Rate Range	±1000°/s
Linearity	±1%
Angular Transverse Sensitivity	<0.01%
Bias Stability	<0.005°/s
Random Walk	<0.005°/s/√hr
Operating Temperature Range	-40°C to +125°C
Shock and Vibration Resistance	N/A
Rate-Integrating Gyro	Yes

Compass/Magnetometer

Compass/Magnetometer Requirements

Magnetometer integrated circuits for use in DIMO compatible devices must adhere to the following:

• Operating Temperature: The magnetometer has an operating temperature range of -40°C to +125°C, which is suitable for the automotive environment.

• Full-scale range: This specification refers to the range of magnetic fields that the magnetometer can measure. The full-scale range is the maximum magnetic field that the magnetometer can detect, and is typically expressed in units of Gauss. DIMO compatible devices must have a full scale range of 2 Gauss.

• Sensitivity: Refers to the sensitivity of the magnetometer to magnetic fields. Sensitivity is a measure of how small of a magnetic field the magnetometer can detect, and is typically expressed in units of microtesla per digit. The magnetometer must have a sensitivity of 0.1 microtesla per digit.

• Noise: This specification refers to the noise level of the magnetometer. Noise is a measure of the random errors in the output of the magnetometer, and is typically expressed in units of microtesla. The magnetometer must have a 0.01 microtesla.

• Output Data Rate: This specification refers to the rate at which the magnetometer produces output data. The output data rate is a measure of how frequently the magnetometer produces new readings, and is typically expressed in units of samples per second. In this case, the magnetometer has an output data rate of 100 samples per second.

• Magnetic field range: Refers to the range of magnetic fields that the magnetometer can measure. The magnetic field range is the range of values over which the magnetometer can provide accurate readings, and is typically expressed in units of Gauss. In this case, the magnetometer can measure magnetic fields within a range of ±2 Gauss.

• Compass heading accuracy: This specification refers to the accuracy of the magnetometer when used as a compass. Compass heading accuracy is a measure of how accurately the magnetometer can determine the direction of the earth's magnetic field, and is typically expressed in units of degrees. In this case, the magnetometer has a compass heading accuracy of 1 degree.

• Hard Iron/Soft Iron sensitivity: This specification refers to the magnetometer's sensitivity to hard iron and soft iron interference. Hard iron interference is caused by permanent magnets or ferromagnetic materials, while soft iron interference is caused by materials that become magnetized in the presence of a magnetic field. The hard iron/soft iron sensitivity is a measure of how much these sources of interference affect the output of the magnetometer, and is typically expressed in units of Gauss. In this case, the magnetometer has a hard iron/soft iron sensitivity of 0.5 Gauss.

Compass/Magnetometer Spec Table

Operating Temperature	-40°C to +125°C
Full-scale range	2 Gauss
Sensitivity	0.1 microtesla per digit
Noise	0.01 microtesla
Output Data Rate	100 samples per second
Magnetic field range	±2 Gauss
Compass heading accuracy	1 degree
Hard Iron/Soft Iron sensitivity	0.5 Ga

Battery & Power Supply

Power Supply

• Wide range of input voltage: The power supply should be able to accept a wide range of Vehicle DC voltages.

• High efficiency: The power supply should be designed for high efficiency to reduce power loss and minimize heat generation. This can be achieved through the use of high-quality components and advanced power management techniques.

• Overvoltage and overcurrent protection: The power supply should be equipped with protective measures to prevent damage from overvoltage and overcurrent events. This can include features such as overvoltage protection, overcurrent protection, and short circuit protection.

• EMC compliance: The power supply should meet the relevant electromagnetic compatibility (EMC) standards to ensure that it does not generate excessive electromagnetic interference that can affect other electronic devices.

• Durability and reliability: The power supply should be designed to withstand the rigors of everyday use and be reliable over time. This can include features such as high-quality components, robust construction, and extensive testing.

Overall, consumer electronics power supply requirements should balance performance, safety, and compliance to provide a robust and reliable power source for the device.

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For a device that draws 12V power from an OBDII port should include the following:

• The input voltage range: The OBDII port is typically designed to provide power at a voltage of 12V, with a tolerance range of +/- 8%. Therefore, the input voltage range for the device should be at minimum 12.96V.

• The input current requirement: The maximum current that can be drawn from an OBDII port is typically limited to 6A. Therefore, the device should be designed to draw no more than 5A of current from the OBDII port.

• The output voltage: The device should be designed to provide a regulated output voltage of <11V to power its internal components.

• The output current capability: The device should have sufficient output current capability to power all of its internal components. The exact amount of current required will depend on the specific components used in the device.

• Protection features: The power supply should include protection features such as overvoltage, overcurrent, and short-circuit protection to prevent damage to the device and the OBDII port in case of fault conditions.

• Switch off: Ability to switch off the power supply at its source during vehicle shutdown.

• EMI/EMC compliance: The power supply should be designed to comply with relevant EMI/EMC standards to ensure that it does not interfere with the operation of the vehicle's electronic systems.

Battery Capacity

DIMO-compatible devices with batteries must have sufficient capacity to ensure prolonged and reliable operation:

• The battery must be able to power the device in sleep mode for a period of greater than 1 year.

• The battery must be able to maintain at least 95% of its capacity after 500 full charge and discharge cycles.

• The battery must be able to operate within a temperature range of -40 to 85 degrees Celsius.

• The battery must meet all relevant safety and performance standards, including but not limited to UL 1642, IEC 62133, and UN 38.3. \

• The battery must be compatible with the device's charging system and meet all relevant electrical and mechanical requirements.

Please note that actual requirements for the battery capacity may vary depending on the specific needs of the device and application. It is important to carefully consider the battery's performance and safety requirements in order to ensure reliable and safe operation of the DIMO device.

Battery Type

Here is a sample specification for battery types for DIMO-compatible IoT devices:

• The chemistry and configuration of the battery is not as important as long as the charging circuitry accommodates the chemistry and configuration.

• All batteries must be replaceable with easy to use connectors.

• The part number for the battery must be visible somewhere on the battery or the product.

• The battery must be able to operate within a temperature range of -40 to 85 degrees Celsius.

• Any RTC (real-time clock) backup batteries must be automotive grade and allow for an RTC to be powered for a minimum of 5 years.

• The battery must meet all relevant safety and performance standards, including but not limited to UL 1642, IEC 62133, and UN 38.3.

• The battery must be compatible with the device's charging system and meet all relevant electrical and mechanical requirements.

• Any lithium-based batteries must adhere to all relevant regulations for shipping, including but not limited to the regulations of the state in which they will be shipped.

Backup Battery

DIMO-compatible devices must comply with the following:

• High discharge rate if required: Backup batteries in electronic devices must be able to discharge a large amount of current quickly if the application requires it, in order to support the high power demands of the device.

• High capacity and long life: Backup batteries in DIMO devices must be able to sustain the device in sleep mode for a period of 1 year.

• Low self-discharge: Backup batteries in electronic devices must have a low self-discharge rate, in order to maintain their charge over time. For example, the battery may have a self-discharge rate of less than 5% per year.

• High temperature tolerance: Backup batteries in electronic devices must be able to withstand high temperatures, in order to operate reliably in the harsh environment of a vehicle. DIMO devices with backup batteries must be able to operate at temperatures ranging from -40 to 85 degrees Celsius.

Physical Requirements

Developer Notes

It is important to ensure that the chosen material is capable of withstanding the operating environment of the IoT device and has the necessary properties for anti-ESD (Electrostatic Discharge) applications. It may also be helpful to consider the inclusion of additional features such as UV resistance, chemical resistance, and impact resistance, depending on the specific requirements of the device.

Dimensions

The device’s dimensions should not be excessive, but include enough space for any electronics and cooling.

Weight

Not to exceed 500g if plugged directly into an OBDII port. If a device is greater than 1KG, mounting brackets must be provided.

Material

DIMO compatible devices must be injection molded where possible. Acceptable materials for injection molding include:

• ABS (Acrylonitrile Butadiene Styrene)

• PC (Polycarbonate)

• PA (Polyamide/Nylon)

For devices that are CNC machined, the above plastics are still preferred. Aluminum 7075-T6 is to be used for any enclosures that require metal. \

Colors

There are no restrictions or requirements on color.

Environmental Requirements

Temperature Classification

The temperature spec of a device refers to the range of temperatures at which it can operate safely and effectively. The International Organization for Standardization (ISO) has established the standard ISO 16750-4 for electronic temperature ratings, which defines the methods for determining and indicating the temperature range at which an electronic device can operate.

DIMO-compatible devices must adhere to this standard, ensuring that they can operate within a specified temperature range without experiencing degradation or failure.

Requirements Table

To body	I, K
To frame	G
On the flexible plenum chamber, not rigidly attached	I, K
In the flexible plenum chamber, not rigidly attached	I, K
On the engine	K, M
In the engine	K, M
On the transmission/retarder	M
In the transmission/retarder	M
Passenger compartment
without special requirements	D
exposed to direct solar radiation	G
exposed to radiated heat	H

Developer Notes

For details on the actual requirements, use the Code Table to find the operating temperature range.

Code Table

Code	Minimum Operating Temperature (°C)	Maximum Operating Temperature (°C)
A	-20	65
B	-30	65
C	-40	65
D	-40	70
E	-40	75
F	-40	80
G	-40	85
H	-40	90
I	-40	95
J	-40	100
K	-40	105
L	-40	110
M	-40	115
N	-40	120
O	-40	125
P	-40	130
Q	-40	140
R	-40	150
S	-40	155
T	-40	160
Z	-40	as agreed upon

Vibrations Classification

DIMO-compatible devices must adhere to and demonstrate compliance to one of the below Automotive vibrations classifications:

• GM3172: This standard specifies requirements for vibration testing of automotive products, including the test frequency range, test duration, and acceptance criteria.

• JIS D 1601: This standard specifies requirements for vibration testing of electrical and electronic products, including the test frequency range, test duration, and acceptance criteria.

• SAE J1211: This standard specifies requirements for vibration testing of electrical and electronic products, including the test frequency range, test duration, and acceptance criteria.

• ISO 10326-1:2016: This standard provides guidance for vibration testing of electrical and electronic products, including the test frequency range, test duration, and acceptance criteria. It also provides guidance on the design and execution of vibration tests, as well as the interpretation of test results.

Dust & Water Intrusion

All DIMO-compatible devices must adhere to IP65 standards for dust and water intrusion.

IP65 is a standard that specifies the requirements for an electrical enclosure to provide protection against the intrusion of dust and water. A device that meets this standard must be designed and constructed in such a way that it is completely protected against the intrusion of dust, and can withstand low-pressure jets of water from any direction without any harmful effects. To meet this standard, the device must be designed and constructed with the following requirements in mind:

• The enclosure must be designed to prevent the ingress of dust, and any openings or gaps must be sealed to prevent the entry of dust.

• The enclosure must be able to withstand low-pressure jets of water from any direction without any harmful effects. This may require the use of special seals and gaskets, as well as water-resistant materials and coatings.

• The enclosure must be sturdy and durable, and able to withstand the mechanical stresses and vibrations that may be encountered during normal use.

• The enclosure must be easy to clean and maintain, and any removable parts or panels must be designed to be securely attached and easy to remove and replace.

• The enclosure must be designed and constructed to meet any other relevant safety and performance standards, such as those related to electrical safety, electromagnetic compatibility, and environmental conditions.

ESD Compatibility

Electrostatic discharge (ESD) immunity refers to a device's ability to operate properly when exposed to electrostatic discharges, such as those that can occur when a person touches the device or when the device is exposed to charged objects or surfaces. ESD can cause damage to electronic devices, so it is important for devices to be immune to ESD in order to ensure their proper functioning.

The tolerances for ESD immunity in automotive grade electronic devices will depend on the specific requirements of the relevant EMC standards and regulations. In general, automotive grade electronic devices are expected to be able to withstand ESD discharges of up to several kilovolts, depending on the specific application and the potential sources of ESD in the operating environment. For example, an automotive grade electronic device that is intended for use in the passenger compartment of a vehicle may be required to have a higher level of ESD immunity than a device that is intended for use in the engine compartment.

In addition to the specific requirements for ESD immunity, automotive grade electronic devices are also typically required to meet other EMC standards and requirements, such as those related to electromagnetic emissions and immunity to other forms of EMI. These requirements are typically detailed in the relevant EMC standards and regulations, and they may vary depending on the intended use and operating environment of the device. When designing a robust electrostatic discharge (ESD) for DIMO compatible devices, there are several key steps to consider:

1. Conduct a thorough analysis of the device's intended environment and use case to identify potential sources of ESD and the potential effects on the device.

2. Design the device's hardware and software with ESD resilience in mind, using appropriate shielding, filtering, and other techniques to minimize the susceptibility of the device to ESD.

3. Conduct testing to verify that the device meets the relevant ESD standards and requirements. This typically involves performing ESD immunity tests to ensure that the device is able to withstand the levels of ESD that may be encountered in its intended environment.

4. Obtain certification from an accredited laboratory or certification body to demonstrate that the device meets the relevant ESD standards and requirements.

5. Implement appropriate measures to maintain the device's ESD resilience over its lifespan, including regular testing and updates to the hardware and software as needed.

In general, the goal of designing a robust ESD resilient electronic device is to ensure that the device can function properly in its intended environment without being damaged by ESD. This requires a thorough understanding of the potential sources of ESD and the appropriate design and testing techniques to minimize and mitigate these effects.

Electromagnetic Compatibility (EMC)

DIMO devices must be EMC-compatible, there are several key steps to consider for a device to be approved on the DIMO Network:

• Conduct a thorough analysis of the device's intended environment and use case to identify potential sources of electromagnetic interference (EMI) and the potential effects on the device.

• Design the device's hardware and software with EMC in mind, using appropriate shielding, filtering, and other techniques to minimize the generation of EMI and to ensure that the device is immune to external EMI.

• Conduct testing to verify that the device meets the relevant EMC standards and requirements. This typically involves performing both emission and immunity tests to ensure that the device does not interfere with other devices and is not affected by external EMI.

• Obtain certification from an accredited laboratory or certification body to demonstrate that the device meets the relevant EMC standards and requirements.

• Implement appropriate measures to maintain the device's EMC compliance over its lifespan, including regular testing and updates to the hardware and software as needed.

• In general, the goal of designing and certifying an EMC compatible device is to ensure that the device can function properly in its intended environment without interfering with other devices or being affected by external EMI. This requires a thorough understanding of the potential sources of EMI and the appropriate design and testing techniques to minimize and mitigate these effects.

The main tests that are used to certify a device as being electromagnetic compatibility (EMC) compliant are emission tests and immunity tests.

Emission tests are used to measure the amount of electromagnetic interference (EMI) that is generated by the device under test (DUT). These tests typically involve exposing the DUT to various electromagnetic fields and measuring the levels of EMI that are emitted by the DUT. The results of the emission tests are compared to the relevant EMC standards to determine if the DUT meets the required limits for EMI emissions.

Immunity tests are used to measure the device's ability to operate properly in the presence of external EMI. These tests typically involve exposing the DUT to various electromagnetic fields and measuring its performance and functionality under these conditions. The results of the immunity tests are compared to the relevant EMC standards to determine if the DUT is immune to external EMI.

In general, emission and immunity tests are used together to ensure that a device is both a good electromagnetic citizen (i.e. it does not generate excessive EMI) and is able to operate properly in the presence of external EMI. Depending on the specific application and intended environment for the DUT, other tests may also be performed, such as surge tests, conducted immunity tests, and radiated immunity tests.

The standards that specify the requirements for emission and immunity tests are called electromagnetic compatibility (EMC) standards. These standards are developed by various organizations, such as the International Electrotechnical Commission (IEC), the European Committee for Electrotechnical Standardization (CENELEC), and the Federal Communications Commission (FCC) in the United States.

The specific standards that apply to a given device will depend on the device's intended use and environment, as well as the applicable regulations in the region where the device will be used. For example, there are different EMC standards for medical devices, industrial equipment, and consumer electronics, and these standards may vary between different countries or regions.

In general, EMC standards specify the limits for EMI emissions and the levels of external EMI that a device must be able to withstand in order to be considered compliant. These standards may also specify the testing methods and procedures that must be used to perform emission and immunity tests, as well as the requirements for certification and labeling of compliant devices.

Electrical Testing & ICT

There are several key electrical design aspects that must be adhered to for DIMO-compatible devices. All devices manufactured on the DIMO network must be ICT tested.

ICT Test Requirements

• Test points: The device should include test points that allow for easy access to the device's circuit board for testing purposes. These test points should be clearly labeled and easy to access.

• Grounding: The device's circuit board should be properly grounded to ensure that electrical signals are accurately measured during ICT testing.

• Power supply: The device should have a stable and reliable power supply that can support the electrical demands of ICT testing.

• Signal integrity: The device's circuit board should be designed to maintain signal integrity during ICT testing to ensure accurate test results. This can include the use of high-quality components, careful routing of signals, and other design techniques.

• Compatibility with test equipment: The device should be compatible with the ICT test equipment that will be used during testing, including any necessary connectors and interfaces.

• Ease of access: The device's circuit board and components should be easy to access for testing purposes, without requiring the disassembly of the entire device. This can include the use of removable panels or other access points.

A test plan must be established and approved for each DIMO-compatible device, and the results from each individual device ICT test should be made available to the DIMO Network.

Functional Requirements

Sleep Mode

The sleep mode requirements for a low power DIMO compatible device can vary depending on the class of device and its intended use. However, in general, the hardware specifications for a low power DIMO compatible device with sleep mode should include the following:

• The device should have a low power standby mode that allows it to consume a minimal amount of power while maintaining connectivity and the ability to wake up quickly in response to external stimuli or internal events.

• The device should support multiple sleep modes with different power consumption levels, so that it can adapt to different scenarios and balance the trade-off between power consumption and responsiveness.

• The device should have hardware support for real-time clocks and timers, so that it can wake up at specific times or intervals to perform scheduled tasks or check for incoming data.

• The device should have hardware support for various low-power communication protocols, such as Bluetooth Low Energy, LoRa or WiFi so that it can communicate with other devices or access points while in sleep mode.

• The device should have hardware-level power management features, such as voltage regulators, power gating, and clock gating, to enable efficient control of the power consumption of individual components.

• The device should have hardware-level support for data encryption and authentication, to secure the communication and protect the device from unauthorized access while in sleep mode.

• The device should have hardware-level support for external wake-up sources, such as physical buttons, sensors, or interrupt signals, so that it can be awakened by external events.

In addition to the above hardware specifications, the device's firmware and software should also be optimized for low power consumption in sleep mode, by implementing power-efficient algorithms and data structures, and by minimizing the amount of processing and memory access while the device is in sleep mode.

Activation & Security

REQUEST FOR IMEI AND SIM NUMBER The International Mobile Equipment Identity (IMEI) and SIM number are unique identifiers that are used to identify a mobile device and its associated SIM card. In order to ensure the security of requests for IMEI and SIM numbers, DIMO requires that certain requirements must are met. Some of these requirements include:

• Encryption: Requests for IMEI and SIM numbers must be encrypted, in order to protect the data transmitted over the network.

• Authentication: Requests for IMEI and SIM numbers must be authenticated, in order to verify the identity of the requesting party.

• Access control: Access to IMEI and SIM numbers must be restricted to authorized parties, in order to prevent unauthorized access to the data.

• Auditing: Requests for IMEI and SIM numbers must be audited, in order to track and monitor access to the data.

• Compliance with relevant standards: Requests for IMEI and SIM numbers must comply with relevant standards, such as 3GPP TS 23.003 and ETSI TS 102 223, which specify requirements for the security of IMEI and SIM numbers.

The specific requirements for each of these points may vary depending on the specific application and the requirements of the network operator or service provider. For example, the level of encryption and authentication may be different for different applications, and the access control measures may need to be more strict for certain applications than for others.

OTA Requirements

The following are the requirements for DIMO-compatible FOTA/SOTA systems for DIMO-compatible devices:

• The system should be able to wirelessly receive and install updates to the device's firmware/software.

• The updates should be delivered securely, using encryption to protect against tampering or unauthorized access.

• The system should be able to verify the authenticity and integrity of the updates, to ensure that they have not been altered or corrupted in transit.

• The system should be able to roll back to a previous version of the firmware/software if the update fails or causes problems.

• The system should be able to handle large firmware/software updates without running out of storage space or causing the device to become unstable.

• The system should be able to install updates in the background, without disrupting the device's normal operation or requiring user intervention.

• The system should be able to automatically schedule and initiate updates at times when they will have the least impact on the device's performance or battery life.

Some popular tools and procedures that could be used to implement these requirements include:

• OTA (Over-the-Air) update frameworks, such as OMA LWM2M or AWS IoT Device Management, which provide a standard way for devices to receive and install updates over the air.

• Digital signature algorithms, such as RSA or ECDSA, which can be used to verify the authenticity and integrity of the updates.

• Secure boot mechanisms, which can be used to prevent unauthorized or malicious software from running on the device.

• Delta updates, which can be used to send only the changes between firmware/software versions, rather than the entire firmware image, in order to reduce the size of the update and the time required to install it.

• Over-the-air programming (OTAP) tools, such as JTAG or SWD, which can be used to debug and troubleshoot the firmware update process.

Developer Notes

FOTA (Firmware Over-the-Air) and SOTA (Software Over-the-Air) are both methods of updating a device's software wirelessly, without the need for a physical connection to a computer. In short, the main difference between FOTA and SOTA is that FOTA updates are limited to firmware, while SOTA updates can be applied to higher-level software. However, there are some key differences between the two:

FOTA Updates

Refer to updates to a device's firmware, which is low-level software that is stored on a device's hardware and controls its basic functions. Because firmware is closely tied to the hardware, FOTA updates are typically limited to minor fixes and improvements, and cannot be used to add new features or change the device's overall functionality.

SOTA Updates

Refer to updates to the device's higher-level software, such as the operating system or application software. Because this type of software is not tied to the device's hardware, SOTA updates can be used to add new features and improve the overall functionality of the device.

Security

Secure Element Devices

All DIMO-compatible devices must contain a secure element with the following:

• Physical and logical security: The secure element should be designed to prevent unauthorized access to its contents, both physically and through software and network attacks.

• Tamper-resistant hardware: The secure element should be designed to detect and respond to attempts to physically tamper with it, such as by removing or bypassing its protective measures.

• Cryptographic capabilities: The secure element should be able to perform cryptographic operations, such as hashing, signing, and encryption, to protect data and ensure the integrity and authenticity of communications.

• Secure storage: The secure element should provide secure storage for sensitive data, such as keys, certificates, and other sensitive information.

• Flexible authentication: The secure element should support a range of authentication methods, such as passwords, biometric data, and hardware-backed keys, to allow for flexible and secure access control.

• Ease of use: The secure element should be easy to use and integrate into IoT devices, allowing developers to quickly and easily add security features to their devices.

• Compliance with industry standards: The secure element should comply with relevant industry standards and regulations, such as those governing data privacy and security, to ensure that it is fit for use in IoT applications.

Physical Tamper Proofing

DIMO-compatible devices must be designed such that the hardware to be difficult to physically open or access without proper tools and expertise. This can be achieved through the use of tamper-evident seals, strong and durable materials, and secure fastening mechanisms.

Device Diagnostics

Self-Diagnostic Program

A robust self-diagnostic program for DIMO-compatible devices must include several key elements. These include:

• Regular diagnostics: The program should perform regular diagnostics to check the health and performance of the device and its components. This can include checks for errors, malfunctions, and other issues.

• Alerts and notifications: The program should be able to send alerts and notifications to the DIMO Network if any issues are detected during diagnostics.

• Fault tolerance: The program should be designed to be fault tolerant, with built-in mechanisms for handling errors and failures. This can include the ability to automatically switch to backup systems or components if necessary.

• Reporting and data analysis: The software/firmware should be able to generate reports and perform data analysis to help diagnose and troubleshoot any issues that are detected. This can include the ability to push the data to the DIMO Network.

Regional Device Certifications

United States

FCC

The Federal Communications Commission (FCC) is a U.S. government agency that regulates the use of the radio frequency spectrum and ensures that electronic devices do not cause harmful interference to other devices or to radio communications. In order to certify a non-medical electronic device for sale in the United States, the manufacturer must ensure that the device complies with the following FCC standards:

• FCC 47 CFR Part 15, Class A:10–1–17: Code of Federal Regulations; Title 47 Telecommunication; Part 15 Radio Frequency Devices; Class A digital device standards.

In addition to these standards, manufacturers of electronic devices must also obtain FCC certification for their products and must include the FCC identification number on the device itself. This allows the FCC to track the device and ensure that it continues to comply with the relevant standards.

ISO

ISO 7637-2:2011: Road vehicles - Electrical disturbances from conduction and coupling - Part 2: Electrical transient conduction along supply lines only.

UL

The UL is a safety consulting and certification company that tests and certifies products for compliance with safety standards. In order to certify a non-medical IoT device for sale in the United States, the manufacturer must ensure that the device complies with the following UL standards:

• UL 62368-1: This standard applies to audio/video, information and communication technology equipment and is intended to provide a means of evaluating the safety of such equipment.

• UL 60730-1: This standard applies to automatic electrical controls for household and similar use and is intended to provide a means of evaluating the safety of such controls.

• UL 60730-2-14: This standard applies to automatic electrical controls for household and similar use and is intended to provide a means of evaluating the safety of appliance controls that incorporate a microprocessor.

In addition to these standards, manufacturers of DIMO compatible devices must also obtain UL certification for their products and must include the UL mark on the device itself. This allows consumers to easily identify products that have been certified by UL and ensures that they meet the necessary safety standards.

CSA

The CSA Group is a safety certification organization that tests and certifies products for compliance with safety standards. In order to certify a non-medical IoT device for sale in the United States, the manufacturer must ensure that the device complies with the following CSA standards:

• CSA C22.2 No. 62368-1: This standard applies to audio/video, information and communication technology equipment and is intended to provide a means of evaluating the safety of such equipment.

• CSA C22.2 No. 60730-2-14: This standard applies to automatic electrical controls for household and similar use and is intended to provide a means of evaluating the safety of appliance controls that incorporate a microprocessor.

In addition to these standards, manufacturers of IoT devices must also obtain CSA certification for their products and must include the CSA mark on the device itself. This allows consumers to easily identify products that have been certified by CSA and ensures that they meet the necessary safety standards.

Europe

EN Standards

In order to certify a DIMO-compatible device for sale in Europe, the manufacturer must ensure that the device complies with the following European standards:

• EN 62368-1: This standard applies to audio/video, information and communication technology equipment and is intended to provide a means of evaluating the safety of such equipment.

• EN 60730-1: This standard applies to automatic electrical controls for household and similar use and is intended to provide a means of evaluating the safety of such controls.

• EN 60730-2-14: This standard applies to automatic electrical controls for household and similar use and is intended to provide a means of evaluating the safety of appliance controls that incorporate a microprocessor.

• EN 301 489-3 V2.1.1: Electromagnetic compatibility and Radio spectrum Matters (ERM); Electromagnetic compatibility standard for radio equipment and services; Part 3: Specific conditions for Short Range Devices (SRD) operating on frequencies between 9 kHz and 40 GHz.

• EN 50498: Electromagnetic compatibility and Radio spectrum Matters (ERM); Harmonized Standard for short-range devices (SRD) operating in the 2.4 GHz ISM band; Generic standards for SRD.

• EN55025:2008: ElectroMagnetic Compatibility (EMC); Immunity for residential, commercial and light-industrial environments.

In addition to these standards, manufacturers of IoT devices must also obtain CE certification for their products, which indicates that the products meet the requirements of the European Union's New Approach Directives. This allows the products to be sold freely within the European market.

ISO

ISO 7637-2:2011: Road vehicles - Electrical disturbances from conduction and coupling - Part 2: Electrical transient conduction along supply lines only.

Canada

ISED

ISED is the abbreviation for Innovation, Science and Economic Development Canada, a government department that is responsible for regulating the sale and use of electronic devices in Canada. The standards that must be adhered to when certifying a IoT (Internet of Things) device for sale in Canada are as follows:

• Radio Frequency (RF) Exposure Compliance: This standard ensures that the device does not emit RF radiation in excess of the limits specified by the Safety Code 6, which is the Canadian standard for human exposure to RF radiation.

• Technical Standards for Information Technology Equipment: This standard specifies the technical requirements that a device must meet in order to be certified for sale in Canada, including requirements related to electromagnetic compatibility, electrical safety, and energy efficiency.

• Labeling and Instruction Manual Requirements: This standard specifies the labeling and instructions that must be included with a device in order to inform users about its proper use and potential hazards.

• Restricted Substances and Materials: This standard ensures that the device does not contain any restricted substances or materials, such as lead or mercury, which can be harmful to human health or the environment.

• Telecommunications Act and Regulations: This standard ensures that the device complies with the requirements of the Telecommunications Act and its related regulations, which govern the use of radio frequency spectrum in Canada.

In summary, the ISED standards that must be adhered to when certifying a IoT device for sale in Canada relate to the device's RF exposure, technical specifications, labeling and instructions, restricted substances, and compliance with telecommunications regulations. These standards are designed to protect the health and safety of users and the environment, and to ensure the proper functioning of electronic devices in Canada.

ISO

ISO 7637-2:2011: Road vehicles - Electrical disturbances from conduction and coupling - Part 2: Electrical transient conduction along supply lines only.