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measured voltage on a pin connected to ground by 4M7 resistor.....kl14 ADC

Question asked by stefano manca on Nov 4, 2014
Latest reply on Nov 4, 2014 by Mark Butcher

Hi, I have an ADC pin connected to ground by a 4.7Mohm resistor. When I read the value by adc I get 32 that means 32*(2.5V/255)=310mV if the reference voltage is 2.5Volt and the resolution is 8 bit.

I wander why the value is so big, it should by almost zero.

Any idea.

How can reduce the sampled value.