RE: Measuring VDD in nRF54L15DK

Kenneth — Thu, 18 Sep 2025 13:42:11 GMT

[quote user="nms"]Not able to set 2/8, look like it is not yet supported in SDK. [/quote]

Hmm... looks like you can't set in devicetree, but you can in code try by:

adc_channels[0].channel_cfg.gain = ADC_GAIN_1_4;

Kenneth

Narendra — Thu, 18 Sep 2025 10:24:17 GMT

In example firmware ADC gain set to 1 (ADC_GAIN_1) that's why it is giving 899mv (0.9V) output?

Gain needs to be changed to 2/6, 2/7 or 2/8 to measure correct value?

Setting gain to 2/6 will measure maximum 2.7V VDD input. (0.9/(2/6) = 2.7).

For 2/7, it will measure up to 3.15V.

Not able to set 2/8, look like it is not yet supported in SDK.

Is this correct?

Thanks,

Narendra