ATMEGA644A-MU

ATmega644A-MU is an 8‑bit AVR microcontroller from Atmel (Microchip) in a 40‑pin MU package. It uses the AVR RISC core and runs up to 16 MHz at 1.8–5.5 V.
Key features
- Memory: 64 KB flash, 4 KB SRAM, 2 KB EEPROM
- I/O and peripherals: 32 I/O lines; three timers (8‑bit Timer0, 8‑bit Timer2, 16‑bit Timer1) with PWM; 8‑channel, 10‑bit ADC
- Communications: USART, SPI, and TWI (I2C)
- Other: watchdog timer, power‑on reset/brown‑out detector, low‑power sleep modes
Development
- Supported by AVR-GCC and Microchip Studio; in‑system programming via SPI; bootloaders are common.
Typical uses
- Embedded controllers for consumer electronics, robotics, sensors, motor control, and small automation projects.
Notes
- If you need more memory or I/O, consider higher‑end ATmega variants; the MU package is suitable for compact boards.

ATmega644A-MU features (concise):
- 8-bit AVR RISC CPU, up to 16 MIPS at 16 MHz
- 64 KB Flash program memory with ISP/bootloader support
- 4 KB SRAM and 2 KB EEPROM
- 32 I/O lines across Port A–D
- Timers: Timer0 (8-bit PWM), Timer2 (8-bit PWM), Timer1 (16-bit with PWM, input capture)
- ADC: 8-channel, 10-bit analog-to-digital converter
- Communications: USART, SPI, and I2C (TWI)
- Analog comparator
- Watchdog timer and brown-out detector
- Multiple interrupt sources (external and pin-change)
- In-system/in-circuit programming support
- Sleep modes: Idle, ADC Noise Reduction, Power-down, Standby
- Clock options: Internal RC and external clock; operates 1.8–5.5V (up to 16 MHz at higher voltages)

- Pin count: 44-pin μQFP (MU) package.
- Function: ATmega644A-MU is an 8-bit AVR microcontroller with 64 KB flash, 4 KB SRAM, 2 KB EEPROM; peripherals include USART, SPI, TWI/I2C, 8-channel 10-bit ADC, and multiple timers (two 8-bit, one 16-bit) with 32 I/O lines for embedded control.

Manufacturer: Microchip Technology Inc. The ATMEGA644A-MU is part of Atmel’s AVR line, which Microchip now produces after acquiring Atmel in 2016. Microchip is a global semiconductor company that designs and manufactures microcontrollers (including AVR), analog, memory, and other embedded components for embedded systems.

ATmega644A-MU is a versatile 8-bit AVR MCU (64K Flash, 4K RAM, 2K EEPROM) with multiple I/O, ADCs, timers/PWM, and serial interfaces (USART, SPI, I2C). Common application areas:
- Embedded control for consumer electronics and home appliances (displays, remote controls, smart meters)
- Industrial automation and instrumentation (data acquisition, sensor interfacing, simple PLC-like tasks)
- Robotics and motor control (PWM for DC/stepper motors, position/sensor interfaces)
- Automotive instrumentation and dashboard components
- Data logging and portable instruments (sensor data loggers, handheld meters)
- Education, prototyping, and hobbyist projects (Arduino-like AVR applications)
- IoT/home automation controllers (sensor hubs, small gateways)

44-pin Thin Quad Flat Pack (TQFP), also called LQFP-44.