TPS65217: HIGH pulse on PWR_EN during shutdown

Hello,

We have a custom board based on the Beaglebone Black. We're noticing a 10ms pulse on the PWR_EN line around 2ms after SYS voltage starts to drop during a shutdown routine (ALARM2 shutdown). We're wondering if this is normal behavior?

Lightblue - SYS; Darkblue - PWR_EN; Pink - PGOOD

At the moment, we're getting an intermittent unintentional reboot 1sec after SYS voltage drops. We see this pulse regardless of a reboot or not.

We believe that the pulse happens just as LDO_PGOOD goes LOW therefore putting the RTC section of the AM3352 into RESET state where PWR_EN is default HIGH. Then since the SYS supply is already dropping, it loses its pull and goes down with it.

We have LDO_PGOOD, PGOOD, and PWR_EN configured just like the Beaglebone Black.

Thanks,

Jesse