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iMX6Q goes reboot instead of poweroff at high temperature?

Question asked by Sergey Antsupov on May 28, 2018
Latest reply on May 29, 2018 by Sergey Antsupov

The issue was stumbled upon during environmental tests of a new design, loosely based on iMX6 smart device board.

Reboot instead of poweroff is always initiated on all the 3 boards available with both 1.2 and 1.3 silicon revision, when the processor junction temperature goes above approximately 93C, judging by embedded sensor data in /sys/class/thermal/thermal_zone1/temp. Other than this the tests are Ok, below the threshold poweroff is Ok, too.

 

The issue persists if the poweroff command is issued by directly writing to SNVS_LPCR register with memtool utility.

During the attempted poweroff the PMIC_ON_REQ pin drops low for approximately 3.8ms then goes high and a normal boot executes. VDD_SNVS_IN voltage shows a small momentary drop, but stays above 2.9V. PMIC interface signals have no other connections.

 

Thanks for the suggestions,

Sergey

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