2 Replies Latest reply on Nov 26, 2014 11:12 AM by hsontag@sontagtech.com

How does P0 and keyscan affect deep sleep?

hsontag@sontagtech.com Nov 21, 2014 3:15 PM

I've seen a couple of posts that suggest that P0 can cause deep sleep to be terminated, because the keyscan causes the device to wake up.

One developer resolved his excessive current draw by pulling P0 high.

I don't plan to have any keys, I'd prefer to leave P0 with no connection or use it as an output.

For deep sleep to continue without interruption, if P0 is programmed as an output, does it still need to be pulled high?

1. Re: How does P0 and keyscan affect deep sleep?

MichaelF_56 Nov 26, 2014 11:07 AM (in response to hsontag@sontagtech.com)

I checked internally and the recommendation continues to be pull P0 high through a 10K resistor to eliminate the potential for any undesired consequences created by the Keyscan feature being available on this pin.

With this said, you could test it out and setup as a output to see if Keyscan still affects the GPIO.
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2. Re: How does P0 and keyscan affect deep sleep?

hsontag@sontagtech.com Nov 26, 2014 11:12 AM (in response to MichaelF_56)

Thanks for checking, I really appreciate being able to get answers to questions like this.

Your suggestion is a good one, I'll see what I can learn.

Hugh
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