GPIO pin V_IH (max) lack of rating in datasheet for ATSAMR21G21

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Dear all,

 

I'm using ATSAMR21G21 for a product, however one of our engineers has interfaced the GPIOs of our ATMega8, which works on 5V to ATSAMR21, using a simple voltage divider. I understand that this isn't the best strategy and so am trying to find workaround, since PCB has already been printed. At first I thought of just directly connecting the GPIO pins using a 300OHM resistor in between for current limiting. However, ATSAMR21 datasheet doesn't say whether GPIO pins are 5V tolerant, or if it does, I haven't found it. Can someone please clarify? Thank you very much

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Last Edited: Thu. Sep 14, 2017 - 12:48 PM
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From reading the datasheet, the pins are not 5V tolerant. Read absolute max specs.

Last Edited: Fri. Sep 8, 2017 - 01:33 PM
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Hey thanks a lot, I totally glossed over the V_PIN rating, expecting some other name for it.

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lemonickous wrote:
ATMega8, which works on 5V

So why not use ATMega8L - which works on 2.7 - 5.5 V ?

 

http://www.atmel.com/Images/Atme...