Schematic And Pin-Out - Arduino MINI PRO 3.3V User Manual

Schematic and Pin-out:

The schematic of the Pro Mini can be broken down into three blocks: the voltage regulator, the
ATmega328 and supporting circuitry, and the headers.
The Pro Mini's pins surround three of the four sides. The pins on the short side are used for
programming, they match up to the FTDI Basic Breakout. The pins on the other two sides are an
assortment of power and GPIO pins (just like the standard Arduino).
There are three different power-related pins: GND, VCC, and RAW. GND, obviously, is the
common/ground/0V reference. RAW is the input voltage that runs into the regulator. The voltage at
this input can be anywhere from 3.4 to 12V. The voltage at VCC is supplied directly to the Pro Mini, so
any voltage applied to that pin should already be regulated to 3.3V.
w w w . e k t . c o m
2
Electronics Katrangi Trading