ITSY M4 AREF always active

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AlainB
 
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Joined: Sat Jul 07, 2018 7:28 am

ITSY M4 AREF always active

Post by AlainB »

Hi,

According to my tests, the silicon bug documented on https://learn.adafruit.com/adafruit-fea ... 51/pinouts is applicable to ItsyBitsy M4 as well, despite the fact that it is not mentioned on https://learn.adafruit.com/introducing- ... m4/pinouts (not surprising, if the bug is on the SAMD51 chip, but it might be a good idea to mention it there too).

For the Feather M4, there is a possibility to cut a jumper to use a reference which is lower than 3.3V. Is there an equivalent possibility on ItsyBitsy? If so, what would be the impact on the DAC ? Would PWM pins be impacted?

Thanks in advance,
A. Baudhuin

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adafruit_support_mike
 
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Re: ITSY M4 AREF always active

Post by adafruit_support_mike »

The ItsyBitsy M4 also has a solder jumper that can disconnect Aref from 3.3V. It’s on the back.

The effects of cutting the jumper will be pretty much the same as the ones listed for the Feather M4.

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