This design is a minimum system based on ATMEGA32U4 single chip microcomputer.

The minimum system of this design includes the reset circuit,

crystal oscillator circuit,

power supply pin and other peripheral circuits necessary for the operation of the single-chip microcomputer,

and all the commonly used pins are led out to facilitate the R & D personnel to embed this solution into the development.

This minimum system is compatible with the single-chip microcomputer packaged with ATMEGA16U2  LQFP-44 .

The structure is compact, and 30 * 30 M3 * 4 mounting holes are reserved for easy installation.

Two 8-bit timers / counters with independent prescaler and comparator functions

A 16-bit timer / counter with prescaler,

compare function and capture function

Real-time counter with independent oscillator RTC four-channel PWM 8-channel 10-bit ADC 8 single-ended channels 7 differential channels in TQFP package 2 differential channels with programmable gain (1x, 10x, or 200x) byte-oriented two Line interface Two programmable serial USARTs SPI serial interface that can work in master / slave mode Programmable watchdog timer with independent on-chip oscillator On-chip analog comparator Special microcontroller features Power on Reset and programmable power-down detection On-chip RC oscillator on-chip / off-chip interrupt souce 6 kinds of sleep modes: idle mode,

ADC noise suppression mode,

power-saving mode,

power-down mode and standby mode,

and extended standby mode I / O and package 32 programmable I / O ports 40-pin PDIP pakage ,

44-pin TQFP package, and 44-pin MLF package Operating voltage: ATmega32-16AU: 4.5-5.5V