Suggested Resistor values for 3.3V resistor ladder? - Chief Delphi

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Suggested Resistor values for 3.3V resistor ladder?

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02-28-2011, 12:45 AM

mikets

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Re: Suggested Resistor values for 3.3V resistor ladder?

Assumptions:

Vcc is the total voltage, whether its 5V or 3.3V.
Imax is the maximum current you can draw.
N is the total number of stages you want.
The input impedance of the analog channel is high enough that makes the current flowing through the analog input insignificant.

Rtotal = Vcc/Imax
R = Rtotal/(N - 1)
Round R up to the next one or more standard resistor value for good margin.

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