IOREF Pin on Grand Central

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xanatos
 
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IOREF Pin on Grand Central

Post by xanatos »

There are two pins on the GC that are labeled as having 3.3V on them - the 3.3V pin, and IOREF. I can find no mention of the IOREF pin in the full "Introducing the Adafruit Grand Central M4 Express" PDF, and only see the 3.3V label on the pinout PDF. I'm wondering what the max current is available on that pin? Thanks

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adafruit_support_bill
 
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Re: IOREF Pin on Grand Central

Post by adafruit_support_bill »

The IOREF pin is part of the Arduino R3 header standard and simply echos the IO voltage used by the processor. For 3.3v processors like the M4, that will be 3.3v.

IOREF is for use by shields so that they can adapt their operating voltage to match that of the processor if necessary.

In general, you should not assume anything about the current available from IOREF. It is for reference only.

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xanatos
 
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Re: IOREF Pin on Grand Central

Post by xanatos »

OK, thanks, good to know.

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