How to power Feather M4 CAN?

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davidthefuturist
 
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How to power Feather M4 CAN?

Post by davidthefuturist »

Hey guys, super dumb question. I found the pinouts for the Feather M4 CAN here: https://github.com/adafruit/Adafruit-Fe ... Pinout.pdf

Power is in dark red as I have noticed. Am I able to apply 3.3.v at the 3.3v pin and connect to GND and have the Feather power on as normal? Likewise, am I able to apply 5V at VBUS to power on the Feather?

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dastels
 
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Re: How to power Feather M4 CAN?

Post by dastels »

Two things:

1. You can not provide 3.3v on the 3.3v pin. The CAN hardware uses the higher voltage that feeds the 3.3v regulator, and that's either 5v from USB or 3.7-4.2v from the LiPo.

2. You can supply 5v using the Vbus/USB pin. However, that's directly connected to the 5v line on the USB-C connector so if you have 5v supplied to the USB pin and plug in a USB cable you have a problem and maybe damage to something. There's no way to protect against this since the USB pin and connector are connected directly with no protection diode.

The safest way to power the board is through the USB connector. You could use something like https://www.adafruit.com/product/4536 or https://www.adafruit.com/product/5180.

Dave

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