I am sure I missed this in the docs - thanks.
I am sure I missed this in the docs - thanks.
The input impedance for a digital input pin is close to infinity when it's configured as an input, and to zero when it's configured as an output.
The analog input pins belong to the ADC, and the prescaler setting will affect their input impedance.
EDIT 2016.03.29: New values can be found in the nRF51 Reference Manual V3.0, Chapter 31.1.3:
The inputs also have some capacitance, 3-4pf.
The impedances given above for the ADC pins are not consistent with the white paper available elsewhere on Nordic Dev Zone: http://tinyurl.com/hzeayvz --- Which of the two sources has the correct answer?
The impedances given above for the ADC pins are not consistent with the white paper available elsewhere on Nordic Dev Zone: http://tinyurl.com/hzeayvz --- Which of the two sources has the correct answer?