Specification	ATMEGA644P-20AUR

A/D Channels	8 count
A/D Resolution (bits)	10 bit
Connectivity	USART, UART, SPI, I2C
Core Processor	AVR
Core Size (Bit Width)	8 Bit
EEPROM Size (Depth)	2 K
EEPROM Size (Width)	8 bit
Mounting Type	Surface Mount
Number of I/O	32
Operating Temperature (Max)	85 °C
Operating Temperature (Min)	-40 °C
Oscillator Type	Internal
Package / Case	44-TQFP
Package Length	10 mm
Package Name	44‑TQFP
Package Width	10 mm
Peripherals	WDT, PWM, Brown-out Detect, POR, Reset
Program Memory Depth	32 K
Program Memory Size	64KB
Program Memory Size	64 KB
Program Memory Type	FLASH
Program Memory Width	16
RAM Size Depth	4 K
RAM Size Width	8 bit
Speed	20 MHz
Voltage - Supply (Vcc/Vdd) Maximum	5.5 V
Voltage - Supply (Vcc/Vdd) Minimum	2.7 V

ATmega644P Series

Newer Device Available ATMEGA644PA

Part	EEPROM Size (Depth)	EEPROM Size (Width)	Operating Temperature (Max)	Operating Temperature (Min)	Program Memory Depth	Program Memory Size	Program Memory Width	Program Memory Size	Package / Case	Core Processor	Peripherals	Voltage - Supply (Vcc/Vdd) Minimum	Voltage - Supply (Vcc/Vdd) Maximum	Number of I/O	A/D Channels	A/D Resolution (bits)	Package Width	Package Name	Package Length	Program Memory Type	Speed	Core Size (Bit Width)	Connectivity	Mounting Type	Oscillator Type	RAM Size Depth	RAM Size Width
Microchip Technology ATMEGA644P-20AUR	2 K	8 bit	85 °C	-40 °C	32 K	64KB	16	64 KB	44-TQFP	AVR	Brown-out Detect POR PWM Reset WDT	2.7 V	5.5 V	32	8 count	10 bit	10 mm	44‑TQFP	10 mm	FLASH	20 MHz	8 Bit	I2C SPI UART USART	Surface Mount	Internal	4 K	8 bit
Microchip Technology ATMEGA644PV-10MU	2 K	8 bit	85 °C	-40 °C	32 K	64KB	16	64 KB	44-VFQFN Exposed Pad	AVR	Brown-out Detect POR PWM Reset WDT	1.8 V	5.5 V	32	8 count	10 bit	7 mm	44-VQFN	7 mm	FLASH	10 MHz	8 Bit	I2C SPI UART USART	Surface Mount	Internal	4 K	8 bit
Microchip Technology ATMEGA644PV-10MUR	2 K	8 bit	85 °C	-40 °C	32 K	64KB	16	64 KB	44-VFQFN Exposed Pad	AVR	Brown-out Detect POR PWM Reset WDT	1.8 V	5.5 V	32	8 count	10 bit	7 mm	44-VQFN	7 mm	FLASH	10 MHz	8 Bit	I2C SPI UART USART	Surface Mount	Internal	4 K	8 bit