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Cerb Analog Inputs


#1

Hello All,

The Cerb chip as multiplexed analog inputs. When the chip is sampling an input are the others electronically disconnected from the chip (i.e. floating)?

E.g. I have 2 variable resistors R1 and R2 connected to A0 and A1. Both resistors are connected to VCC. If I vary R1 it will affect R2’s reading; and I don’t think R2(D2) would like that :slight_smile:


#2

The Cerb40? It has multiplexed interrupts, but I couldn’t find anything about multiplexed analog, specifically.

You are putting the pot between VCC and GND and applying the center tap to the Cerb40?


#3

The Cerb chip (STM32F405RG) has 16 analog channels shared by the 3 ADCs. As for the pot: yes.


#4

That’s what he means by “multiplexed”. There isn’t a one-to-one correlation between ADCs and channels.