Analog inputs, maximum voltage ?

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fredfit
Posts: 10
Joined: 17 Jun 2020 12:50

Analog inputs, maximum voltage ?

Post by fredfit »

Hi all,

I cannot find any info about the maximum voltage that the Z-Uno can accept on its Analog inputs when powered at 5V.
Can someone please advise ?
Thanks !

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PoltoS
Posts: 5956
Joined: 26 Jan 2011 19:36

Re: Analog inputs, maximum voltage ?

Post by PoltoS »

Z-Uno itself should never be connected to voltage bigger than Vcc +10%. This means 3.6 V is the maximum.

Anyway, if your reference bus GND/Vcc, everything above Vcc gives max value in ADC

petergebruers
Posts: 249
Joined: 26 Jul 2015 17:29

Re: Analog inputs, maximum voltage ?

Post by petergebruers »

BTW never inject current into a pin, I mean when you have no power to your Z-Uno then, for example, do not connect an input to a 3V battery without limiting current. The best thing that can happen is this... Your source connected to that pin powers up the Z-Uno (which might lead you to believe a Z-Uno can work without power- LOL) and worst case it destroys the Z-Uno. Use a buffer or a resistor to limit current (eg 330 ohm for general experimenting).

fredfit
Posts: 10
Joined: 17 Jun 2020 12:50

Re: Analog inputs, maximum voltage ?

Post by fredfit »

Thank you !


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