0

M0 Feather - Voltage threshold GPIO high or low?
Moderators: adafruit_support_bill, adafruit

Please be positive and constructive with your questions and comments.

M0 Feather - Voltage threshold GPIO high or low?

by IoTAll on Tue Sep 28, 2021 3:47 pm

Hi!

I try to find this info but couldn't concerning the Feather M0.

What it the mininum voltage at a GPIO digital pin to be read as HIGH, and what is the maximum voltage so that it is read as LOW?
Or does the voltage at those pin very close or at 0V for LOW and very close or at 3.3V to be read as HIGH?

Is it the same for all GPIO digital pins?

Thank you!

IoTAll
 
Posts: 217
Joined: Wed May 31, 2017 6:34 pm

Re: M0 Feather - Voltage threshold GPIO high or low?

by dastels on Tue Sep 28, 2021 5:16 pm

According to section 37.9.1 on page 991 of the ATSAMD21 datasheet, assuming Vdd is 3.3 volts (which it should be on the Feather):
- low is a max of 0.99v
- high is a min of 1.8v

Dave

dastels
 
Posts: 7578
Joined: Tue Oct 20, 2015 3:22 pm

Please be positive and constructive with your questions and comments.