ATMEGA2561-16AU

Product Overview

The ATMEGA2561-16AU from Microchip Technology is an 8-bit AVR ATmega microcontroller in a 64-TQFP surface-mount package. It operates at 16MHz, provides 256KB of flash program memory, 8K x 8 RAM, and 4K x 8 EEPROM, with 54 I/O pins. The device includes an internal oscillator and supports EBI/EMI, I2C, SPI, and UART/USART connectivity. It operates from 4.5V to 5.5V and is rated from -40°C to 85°C ambient temperature.

Key Features

• 8-bit AVR core operating at 16MHz
• 256KB flash program memory with 8K x 8 RAM and 4K x 8 EEPROM
• 54 I/O pins
• EBI/EMI, I2C, SPI, and UART/USART interfaces
• Eight 10-bit analog-to-digital converter channels
• PWM, watchdog timer, power-on reset, and brown-out detect/reset peripherals
• Internal oscillator
• 4.5V to 5.5V supply range
• -40°C to 85°C ambient operating range
• 64-TQFP surface-mount package

Applications

• Embedded control systems requiring multiple digital I/O and serial communication
• Sensor data acquisition using 10-bit analog-to-digital conversion
• Timing and control output generation with PWM
• Communication gateways using I2C, SPI, or UART/USART

Design & Procurement Notes

Design teams should verify that the system supply is within 4.5V to 5.5V and that the ambient environment remains within -40°C to 85°C. The 64-TQFP surface-mount package and 54 I/O pins affect board layout, connector planning, and peripheral routing. The internal oscillator and 16MHz speed are relevant to clocking requirements, while the EBI/EMI, I2C, SPI, and UART/USART interfaces provide options for bus or serial devices. The 256KB flash, 8K x 8 RAM, and 4K x 8 EEPROM should be evaluated against firmware, runtime data, and storage needs. The brown-out detect/reset, power-on reset, watchdog timer, PWM, and analog-to-digital conversion functions should be considered in system supervision and control design.