proMini 32MHz features the LGT8F328 which is compatible with the ATmega328 with extra features like max clock of 32MHz internal. Clock frequency can be changed from the sketch - no need to flash a new bootloader. There are other enhancements as well. An excellent Arduino boards package by David Buezas is available.

proMini 32MHz uses the SSOP-20 MCU package - some GPIO pins are multiplexed on the same physical pin..

The proMini32 will operate at 3.3 - 6 V.

a USB UART is required... board is designed to accomadate a CP2102 but a FTDI may be used by connecting it with jumpers... the CP2102 may be optionally included.