nrf9160dk voltage

RE: nrf9160dk voltage

Kenneth — Mon, 05 Jun 2023 20:25:29 GMT

I would really prefer to see measurement that show the discrepancy you mention, it's easier for me to make a good case internally then. Until there is a measurement it could just be that VBAT is measured at the same time as there is a drop in VDD also. I would expect a few % error, but not 330 to 500mV no.

Kenneth

RE: nrf9160dk voltage

akuadev — Thu, 01 Jun 2023 12:37:16 GMT

Hello, That is correct the graph is a typical difference of measurement which is small. Another board has differences that are much greater (300mv). I am also seeing larger than typical differences in %xvbat sequential measurements. Is there a %error or accuracy you can provide for %xvbat?

RE: nrf9160dk voltage

Kenneth — Thu, 01 Jun 2023 07:25:57 GMT

I don't see a problem here in VBAT reading?

Kenneth

RE: nrf9160dk voltage

akuadev — Wed, 31 May 2023 20:38:43 GMT

Thanks for your help. I used a voltage logger on VDD while the board was running our application.

RE: nrf9160dk voltage

Kenneth — Wed, 31 May 2023 12:46:03 GMT

Hello,

[quote user=""]Can you please provide some guidance on how to resolve and or best practices for voltage measurement.[/quote]

I recommend to start the debugging by measuring VDD over time using an oscilloscope and/or possible a logic analyzer with analog inputs. We need understand the ripple on VDD before we can comment on the measurement values using AT%XVBAT. For test you can also try to use a steady power supply for comparison.

Kenneth