The ATMEGA644A-AU from Microchip Technology is a high-performance, low-power 8-bit AVR RISC microcontroller operating at up to 20MHz. It is designed for embedded control, industrial equipment, instrumentation, user interfaces and general-purpose MCU applications requiring substantial memory and peripheral resources. Microchip currently lists the ATmega644A family as In Production.
The device integrates 64KB of ISP programmable Flash memory with read-while-write capability, 4KB of SRAM and 2KB of EEPROM. This memory configuration supports larger embedded applications while providing nonvolatile EEPROM storage for configuration and calibration data.
The ATmega644A provides 32 general-purpose I/O lines together with 32 general-purpose working registers. Its enhanced AVR RISC architecture is optimized for efficient instruction execution and flexible embedded control.
Analog resources include an 8-channel 10-bit ADC with optional differential-input operation and programmable gain, together with an integrated analog comparator. These functions support direct interfacing to sensors and other analog signals.
Communication peripherals include two programmable USARTs, an SPI serial interface and a byte-oriented Two-Wire/I²C-compatible interface. The device also provides an IEEE 1149.1-compatible JTAG interface for boundary scan, on-chip debugging and programming.
Timer resources include two 8-bit timer/counters and one 16-bit timer/counter, supporting compare, input-capture and PWM functions. Up to six PWM channels are available, together with a programmable watchdog timer and multiple interrupt sources.
The ATmega644A family operates from 1.8V to 5.5V and provides multiple software-selectable power-saving modes, allowing designers to balance processing performance and power consumption.
The exact ATMEGA644A-AU ordering option is supplied in a 44-pin TQFP package and is rated for -40°C to +85°C industrial operation. Microchip identifies the exact device as a 20MHz, TQFP, Industrial Temperature, Green part supplied in 160-piece tray packaging.
Key Specifications:
- Brand: Microchip Technology
- Part Number: ATMEGA644A-AU
- Family: ATmega / AVR
- Product Type: 8-Bit Microcontroller
- CPU Architecture: AVR Enhanced RISC
- Maximum Frequency: 20MHz
- Flash Memory: 64KB
- SRAM: 4KB
- EEPROM: 2KB
- Supply Voltage: 1.8V to 5.5V
- General-Purpose I/O: 32
- ADC: 8-Channel 10-Bit
- Differential ADC Input: Supported
- Programmable ADC Gain: Supported
- Analog Comparator: Yes
- USART: 2
- SPI: Yes
- Two-Wire / I²C: Yes
- JTAG: Yes
- 8-Bit Timers: 2
- 16-Bit Timer: 1
- PWM Channels: Up to 6
- Watchdog Timer: Yes
- Brown-Out Detection: Yes
- Power-On Reset: Yes
- In-System Programming: Yes
- Read-While-Write Flash: Yes
- Power-Saving Modes: Supported
- Operating Temperature: -40°C to +85°C
- Package: TQFP-44
- Pin Count: 44
- Mounting Type: SMD / SMT
- Packaging: Tray
- Tray Quantity: 160 pcs
- Product Status: In Production.
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