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TRK-MPC5634M Power supply issue - Safe Mode

Question asked by raphc63 on Oct 1, 2015
Latest reply on Oct 6, 2015 by raphc63



I have a power supply issue on my starter kit TRK-MPC5634M

Datasheet :

Schematic :


When I want to supply the board externally ( 9V-12V barrel connector ), the D4 LED turns RED ( safe mode ). When I supply the board by USB all is fine.

This LED D4 is connected to MCZ33905 ( Datasheet : )


Informations about this "safe" is :

"Output of the safe circuitry. The pin is asserted LOW in case of a safe condition is detected (e.g.: software watchdog is not triggered, VDD low, issue on reset pin etc.). Open drain structure."


I checked th device VBAT, which is correct. For other condition I don't know how to check if there is an issue on reset pin or watchdog.