Query Regarding Power LED Indication Using STPMIC1APQR RSTn Signal
Hello,
We are designing a custom board using the STM32MP157FAC1 and have used the STPMIC1APQR PMIC to power the microprocessor, similar to the STM32MP157F-DK2 evaluation board.
We need to provide a Power LED on the front panel of the card to indicate that all the power rails generated by the STPMIC1APQR are operating correctly.
Since the STPMIC1APQR does not provide a dedicated Power_Good (PGOOD) output signal, we are considering using the RSTn pin (Pin 1) to drive the Power LED along with its connection with NRST pin of STM32MP157FAC1. Our understanding is that RSTn is released (driven high) only after the power-up sequence has completed successfully and all required power rails are within specification. If any monitored power rail fails, RSTn would be asserted low.
We plan to use a transistor stage to drive the LED from the **RSTn** signal so that:
(1.) RSTn = High: Power LED ON
(2.) RSTn = Low: Power LED OFF
Could you please confirm whether this is approach is okay or not ? If not, kindly suggest the preferred method to implement a reliable power status indication when using the STPMIC1APQR.
Regards
