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Topic: MKRZERO maximum Vin rating (Read 1 time) previous topic - next topic

MicheleMaris

Dear All,

I would like to supply power to an MKRZero through the Vin using 4
AA cells.

The maximum theoretical voltage (with new cells) would be 6 volts.

I looked at the MKRZero web page,
https://www.arduino.cc/en/Main/ArduinoBoardMKRZero&

it rated Vin between 5 and 6 V.

So it seems there would be no problems.

However at the end of the web page it is stated "Please DO NOT POWER VIN with more than 5V."

So my question is: may I use up to 6V on Vin?

Thank you very much
Mic

CrossRoads

If you look at the schematic
https://www.arduino.cc/en/uploads/Main/ArduinoMKRZero-schematic.pdf
you'll see that Vin just goes thru a couple of MOSFETs and then is connected to 5V.
There is no regulator. Any external devices connected to the 5V pin will essentially see whatever is on Vin.
So I would limit Vin to 5V.
4 NiCads, or 4 NiMH would provide 4.8V and would be a safer option than 4 standard AAs, which could be higher than 6V total when fresh.
Designing & building electrical circuits for over 25 years.  Screw Shield for Mega/Due/Uno,  Bobuino with ATMega1284P, & other '328P & '1284P creations & offerings at  my website.

MicheleMaris

Ok thank you, I will try this way
M.

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