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11 years, 10 months ago.

sensing voltage source accurately at analogue pins

Can anyone tell me the internal impedance of the analogue input pins in the mbed? I'm trying to sense voltage but when connected I get a large volt drop!

im having the same problem, have you figured it out?

posted by Hammad Sheikh 07 Dec 2013

1 Answer

Erik -
10 years, 11 months ago.

For the LPC1768 the output impedance of the circuit driving the analog in pins should be less than 7.5kOhm, and (large) capacitances also aren't allowed.

how do you consider large capacitance? 1uF? 0.1uF? thanks for the answer

posted by Zi Jen Sam 26 Apr 2016