STM6600 Not allowing project to power back up after shutdown
Hello,
we are using the STM6600CS25DM6F in our Project. We have CSRD tied to a 1uF cap, so 10 seconds long press on PB and SR (PB and SR tied together) for a forced shutdown. We use a 5 sec hold to initiate a shutdown via our controller. Once the controller identifies the button press it completes some house keeping and removes PS hold which disables the 1.8V supply, this works fine. The STM6600 is powered from our 3.7V battery rail which is always present. The issue is when we try to use the Pushbutton to power back up. This is very inconsistent. We verified that 3.7V is present and that the PB /SR at the STM6600 is toggling correctly. The STM6600 just wont enable the EN pin. If we remove the battery and crowbar the 3.7V rail, discharging residual capacitance then this works some of the time. It just seems like the STM6600 is entering a strange state when PSHOLD is removed. Thanks, John