Taking ADC readings from P0.14 and P0.15

RE: Taking ADC readings from P0.14 and P0.15

hmolesworth — Wed, 27 Feb 2019 17:47:27 GMT

I was just looking at this; the nRF52 has to be correctly controlling the FET DPDT switches (mux), which it may be but wotrth checking:

For example, P0.15 requires nRF52_P1.12 to be low (U7 switch) or set as input,and also nRF52_P0.13 must be high (U5 switch)

RE: Taking ADC readings from P0.14 and P0.15

JustWalt — Wed, 27 Feb 2019 17:20:37 GMT

Hmm, interesting. I tried the workaround, decreasing the VDD_GPIO to 1.8V using SW11. However, the board still reads values of 200 and 1500 for pins P0.14 and P0.15, no matter the input voltage.

RE: Taking ADC readings from P0.14 and P0.15

run_ar — Wed, 27 Feb 2019 12:48:24 GMT

Hi,

Can you check if you could be affected one of the erratas? https://www.nordicsemi.com/DocLib/Content/Errata/nRF9160_EngA/latest/ERR/nRF9160/EngineeringA/latest/err_160