Hardware reset for nrf9160

RE: Hardware reset for nrf9160

ketiljo — Fri, 06 Aug 2021 07:56:45 GMT

If VDD_GPIO to the nRF9160 and VDD to the other MCU have the same voltage, you can just connect both reset lines to the PMIC. If not, you need a level shifter. The nRF9160 have an internal 13 k pull up resistor to VDD_GPIO.

RE: Hardware reset for nrf9160

Rkidechaa — Thu, 05 Aug 2021 17:41:01 GMT

Thanks you for reply ketiljo.

[quote userid="2125" url="~/f/nordic-q-a/78252/hardware-reset-for-nrf9160/323482#323482"]It's fairly unusual to have a active high reset pin, so check the other MCU again. It's possible that you can just connect them together.[/quote]

I guess I forgot to mentioned that PMIC gives active-low reset output (PFN2). when we press switch SW1(connect to ground) connected to pin PFN1.

currently we connected PFN2 pin directly to RESET pin of Max32630 MCU. so when we press SW1 it give active output to RESET rest of the time it gives 1.8V due to pull up resistor.

I feel we can connect PFN2 pin to reset pin of nrf9160. But need to confirm that is it necessary to use MOSFET circuit or connect it directly?

Just refer above circuit for your reference.

Thank you.

RE: Hardware reset for nrf9160

ketiljo — Thu, 05 Aug 2021 09:58:07 GMT

The reset pin is an input only., active low. It will not be pulled low from the nRF9160 side if you do a system reset command.

You don't need to connect the programmer to the reset line, only SWDIO and SWCLK are needed.

It's fairly unusual to have a active high reset pin, so check the other MCU again. It's possible that you can just connect them together.