About nRF52832 ADC reference voltage question.

[vsion]

Hello, ererybody!

    I use nRF52832,have a development board.

   I was testing the adc module,using the ANI2 channel,I measured the ANI2 channel voltage to the ground,find it voltage was about 3.3v, but isn't the reference voltage 0.6v?Not only is there no distortion but is works,why?Shouldn't the measured voltage be less than 0.6V of the reference voltage?Why is that?

  TKS.

[Jørgen Holmefjord]

Hi,

How did you measure the AIN2 voltage? Did you connect the pin to some source? How is the analog input configured?

You can sample voltages up to VDD, by using different GAIN settings, even if the reference is 0.6V. Please have a look at the documentation on how digital output is computed.

Best regards,
Jørgen