RE: nrf9160-dk reset with external supply at 3V

Anthony Ambuehl — Fri, 11 Jun 2021 18:45:31 GMT

The problem seems to come from the nrf9160 DK "power supply circuitry" If I inject 3.3V at both the external supply header and the high side of the nRF9160 current measurement header, the system operates without reset.

RE: nrf9160-dk reset with external supply at 3V

Albrecht Markus Schellenberger — Fri, 11 Jun 2021 12:50:01 GMT

Hello Anthony,

Modem operations at 3.3V could be on the limit to what is possible. The current shown in this table are measured with a power supply of 3.7V. I guess you get a noticeable voltage drop before the DK is resetting? You might wanna remove the current limit and see if the behaviour changes.

Otherwise I wonder if there could be any series resistance in your measurement set-up that is enough for a voltage drop resetting the DK?

There is an AT command for Power off warnings from the modem which starts at 3300mV and thus considered as low power.

Regards,

Markus