0V or Ground.
No negative voltages of any amount.

From: beagleboard@googlegroups.com [mailto:beagleboard@googlegroups.com] On 
Behalf Of claudiocplar...@gmail.com
Sent: Thursday, July 27, 2017 6:46 AM
To: BeagleBoard <beagleboard@googlegroups.com>
Subject: Re: [beagleboard] Negative voltage on GPIO


Thank you for the reply.

But what is the minimum voltage that can be applied to a GPIO without breaking 
them?
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