ATMEGA644P in ATmega Family
The ATMEGA644P is an 8-bit high-performance AVR RISC-based microcontroller developed by Microchip Technology (formerly Atmel). Featuring 64KB of self-programming flash memory and 4KB of SRAM, it serves as a middle-tier solution within the megaAVR family. It is specifically designed for applications requiring more I/O and memory than the ATmega328P but without the footprint of the ATmega1280. The 'P' suffix denotes picoPower technology, which provides optimized power consumption in sleep modes and active operation.
Variants in This Sub-Family
Variants within the ATMEGA644P sub-family primarily differ by their package type and operating temperature range. Common packages include the 40-pin PDIP for prototyping and the 44-pin TQFP or VQFN for surface-mount production. Some variants specify different maximum clock frequencies, such as the 20MHz '20AU' versus lower-speed versions optimized for 1.8V to 3.6V operation, though most modern silicon supports the full voltage range.
