Power Supply and Heat Dissipation¶

• Table of contents
• Power Supply and Heat Dissipation
  • Power consumption
  • Environmental Testing
    • Stress Testing
  • SOM consumption while Sleeping and Powered Down
    • Consumption while SOM is powered Down
    • Consumption while SOM is sleeping
    • Consumption when running AI models

The information provided is intended to provide guidance for carrier card PCB designers in order to determine power supply requirements as well as consider thermal power management for the MitySOM-AM62x.

All of the data supplied on this webpage had been collected on the MitySOM-AM62x development kit with a 6254-TX-DAD-RI SOM.

Power consumption¶

Power consumption reported on this page represents the measured +3.3V voltage and current using the LTC2945HUB-1 (U1) on the Development Kit, which monitors the +3.3V rail fed to the MitySOM-AM62 via the DDR4 SODIMM interface.

It should be noted that some of the power reported includes the 1.8V output supply delivered by the SOM back to the Development Kit baseboard in order to supply IO voltages for the Ethernet PHYs and reference voltages for the TFP410 PHY. The delivered power from the 1.8V rail is not measured / included with these results, though it is expected to be less than 200 mW based on the datasheets for these attached devices. Customers planning to leverage significant current from the 1.8V supply provided by the SOM should consider that the PMIC on the SOM may consume additional power (approximately 10-15% as the supply is typically 85-90% efficient).

Measurements so far indicate an overall SOM power consumption that ranges between 1W and 3W when powered on (not sleeping, etc.) under various load conditions.

Environmental Testing¶

Stress Testing¶

Each MitySOM-AM62 SOM model was independently stress tested within an environmental chamber across a temperature range of -45°C to +85°C to validate functionality and observe thermal behavior under heavy compute loads.

Below is an overview of results for each MitySOM-AM62 model:

SOM Model	Key Interfaces Tested	Max Measured Silicon Temp @ 85°C Ambient	Max Measured Power @ 85°C Ambient	Detailed Report
MitySOM-AM62x	CPU, DDR4, eMMC, SD, OSPI NOR, Dual GbE, USB 2.0, 3D Graphics	104.44°C	3.19 W	AM62x Temperature and Power Environmental Stresstesting Results
MitySOM-AM62Ax	CPU, DDR4, SD, 1 GbE, DSP, HDMI Display	98.45°C	3.19 W	AM62Ax Temperature and Power Environmental Stresstesting Results
MitySOM-AM62Px	CPU, DDR4, SD, 1 GbE	101.93°C	3.48 W	AM62Px Temperature and Power Environmental Stresstesting Results

Note: For detailed environmental chamber profiles, thermal rise curves, heatsink comparisons, and I/O benchmark figures for each SOM variant, please refer to the child pages linked above.

SOM consumption while Sleeping and Powered Down¶

Tests were performed to measure the power consumed on the MitySOM-AM62x development kit and SOM while the SOM was powered down as well as in sleep mode.

Consumption while SOM is powered Down¶

In this test, the SOM PMIC was commanded to power down all controlled supplies on the SOM via the poweroff command.
Note the SOM power consumption when off should be limited to the PMIC TPS65217 powered-down power usage which is 6uA. Our current measuring setup wasn't precise enough to measure currents that low.

Description	Voltage	Current	Power Consumed	Notes
DevKit board input	12V	0.12A	1.441 W	The local power supplies, ethernet PHYs, etc., remain powered on the DevKit while the SOM is powered down
SOM Input Supply	3.3V	1.15mA	3.75 mW	The LEDS were configured to be disabled for this test

Consumption while SOM is sleeping¶

In this test, the SOM was commanded to enter memory sleep for 10 seconds with the following command. In the sleep state, the AM62x processor state is held in memory and the local PMIC power supplies are still enabled. However, the AM62x does shut down many voltage and clock domains in order to reduce overall consumption.

Important Notes for DeepSleep For MitySOM-AM62

root@mitysom-am62x:~# rtcwake -s 10 -m mem

Description	Voltage	Current	Power Consumed	Notes
DevKit board input	12V	0.09A	1.081 W	The local power supplies, ethernet PHYs, etc., remain powered on the DevKit while the SOM is sleeping
MitySOM-AM62x Input Supply	3.3V	14mA	46 mW	The LEDS were configured to be disabled for this test
MitySOM-AM62A Input Supply	3.3V	35mA	115 mW	The LEDS were configured to be disabled for this test
MitySOM-AM62P Input Supply	3.3V	14mA	45 mW	The LEDS were configured to be disabled for this test

Consumption when running AI models¶

Description	Voltage	Current	Power Consumed	Notes
MitySOM-AM62A AI Camera w/ POE	54V	78mA	4.21 W	Entire board power; driving Micro HDMI and a MIPI camera. Defect detection demo