Author Topic: SAMD21: Unexpected port I/O failure mode [IDENTIFIED: ESD]  (Read 1967 times)

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Offline ataradov

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Re: SAMD21: Unexpected port I/O failure mode [IDENTIFIED: ESD]
« Reply #25 on: March 19, 2021, 02:54:49 am »
Path does not matter, the signal normally does not go "through" TVS. TVS is just sitting on the line and clamps it to a set voltage in case of an over-voltage. It does so by passing the current through itself.

Clamping to both supply rails is better, but it is hard to tell if it is necessary here.
Alex
 

Offline nigelwright7557

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Re: SAMD21: Unexpected port I/O failure mode [IDENTIFIED: ESD]
« Reply #26 on: May 22, 2021, 03:04:13 am »
Usual problem with micros when ports dont work is port is set to analog.
I know on PIC's you have to set ANSEL register accordingly.

 


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