Argh !
Forgot the PIC-tag...
Trying again.

Sorry...
Jan-Erik.

-- Original mail :


Scenario:
PICkit2 with low-pin-count board (16F690).

That board has a 10k pot with a 1 k resistor
connected between the wiper and the AN0 input.

Now, when running the ADC-demo program (number 4 of the
lessons, called ADC.ASM), I can see a larger then I
expected voltage drop across the 1 k resistor. Up to
0.85 V when the pot is at the 5V end. That is, there
must go aprox 0.85 mA into the RA0/AN0 pin.

Is that expected ? I've read the datasheet back and forth
but can not find any note sayig that the AN0 input should
draw that amount of current. A few uA's leakage maybe...

It doesn matter if I put a 1 sec delay between the ADC
conversions, the voltage drop across the 1k resistor
stays the same.

What is going on ?

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