Please direct me to reference for use of the VIN pin on a Micro board. I want to power the board with four, 1.5 volt alkaline batteries. It looks to me like it is the pin between 11 and ground pin, lower left in the diagram.
Thanks.
Looking for confirmation? Check the schematic 
But that third pin is indeed Vin.
Be aware that the spec states:
What is the part number of the Micro's 5 volt regulator?
Okay, I plugged it in, and the board powered without smoking!
While waiting (which wasn't long, (thanks)), I looked at other pin diagrams for the Micro, and pin 11 is not always where I said it was. It's actually not where pin 11 is on my board. I can find pin 11 in your schematic , which is where it is on my board, but not the VIN pin. I am guessing it is VBUS?
Your schematic names the first pin south, PAD, which looks like a ground, to me.
My board has 2 pins, NI (?), and SCR (?). What do those pins do? Just curious...
This datasheet says the 5V regulator is NCP1117:
https://www.arduino.cc/en/uploads/Main/arduino-micro-schematic.pdf
NCP1117 datasheet (page 3) says dropout at 500mA is 1.01V:
https://www.onsemi.com/pdf/datasheet/ncp1117-d.pdf
So 6V in will be borderline, when battery voltage sags below 6V, the Vcc voltage may sag below 5V.
Awesome. You are referring to the 5v schematic in the upper right of the layout? It has 2 VINs, unlike the 3v, below, which has only one.
What is the function of the component named PMV48XP T2 ? (I'm also working with low voltage power supplies.)
That's the "auto-power-select" MOSFET that blocks backfeeding the USBV when more than 6.6V is connected to the barrel jack or VIN pin.
One more, then I will start a new topic; can you please provide complete Micro board schematic.
I did, in reply #5, but there are variants and your Micro might be a little different.
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