Maximum temperature of iMX7S

Technical Support
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1

What’s the maximum operating temperature of the Colibri iMX7s? According to the datasheet it is 85°C but there is a footnote that I don’t understand. The footnote says “Depending on cooling solution.”.

Is the internal temperature that I can read from the SoC the one that should not exceed 85°C? Or is 85°C the maximum ambient temperature and the internal temperature may even be higher?

Best regards,
Michael

2

Maximum allowed die temperature is 95°C. When temperature of SOC die reach 83°C OS starts CPU throttling to prevent overheating. When die temperature reach that 95°C - OS initiates emergency shutdown. In case of low to moderate CPU load difference between die temp and SOC surface temp is around 10-15°C

3

Thanks for the detailed answer. The temperature that I read (according to High performance, low power Embedded Computing Systems | Toradex Developer Center) is the die temperature, right?
Best regards,
Michael

4

Yes, this is the CPU temperature as stated here.
Best regards, Jaski

5

Hello @alex.tx

I have a follow-up question:

I saw the following change in the BSP v2.8 release: Toradex System/Computer on Modules - Linux BSP Release

Does that mean it is save to operate the iMX7s up to 105°C. Is this the new maximum allowed die temperature? What is the reason that the thresholds were changed? Are all the imx7s Colibri modules rated the same or is there a new category of higher temperature modules?

Best regards,
Michael

6

According to NXP datasheet maximum allowed junction temperature is 105C. So after testing we adjusted critical shutdown temperature to be on par with NXP recommendation.