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Enabling SAADC vddhdiv5 measurements on nrf5340

Hello,

I would like to measure battery voltage that is connected to the VDDH pin of an nrf5340 custom board. I understand that this is possible using the nrfx saadc driver, using vddhdiv5 as input to the ADC, but I lack the coding skills to implement this. I can also not find an example in thenrf connect sdk.

Thanks,

Jowan

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0 user14926 over 4 years ago

Hi,

There is no nrfx_saadc example in the nRF Connect SDK, but you can start out with the sample created by my colleague in this post. You will need to modify is a bit to work with nRF5340 DK, see this post. In this sample, you should be able to set the input to VDDH/5 (NRF_SAADC_INPUT_VDDHDIV5) in NRFX_SAADC_DEFAULT_CHANNEL_SE() macro.

You may also be able to modify the input in the Zephyr NRFX Battery sample to use the VDDH/5 input (SAADC_CH_PSELP_PSELP_VDDHDIV5), but I have not tested this.

Best regards,
Jørgen
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0 user14926 over 4 years ago

Hi,

There is no nrfx_saadc example in the nRF Connect SDK, but you can start out with the sample created by my colleague in this post. You will need to modify is a bit to work with nRF5340 DK, see this post. In this sample, you should be able to set the input to VDDH/5 (NRF_SAADC_INPUT_VDDHDIV5) in NRFX_SAADC_DEFAULT_CHANNEL_SE() macro.

You may also be able to modify the input in the Zephyr NRFX Battery sample to use the VDDH/5 input (SAADC_CH_PSELP_PSELP_VDDHDIV5), but I have not tested this.

Best regards,
Jørgen
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