ATMEGA2561-16MU
ATMEGA2561-16MU - 8-bit AVR MCU 256KB Flash 16MHz 64-QFN | Microchip
The Microchip ATMEGA2561-16MU is a high-performance, low-power 8-bit AVR RISC-based microcontroller integrating 256 KB of in-system programmable Flash, 8 KB SRAM, and 4 KB EEPROM, operating at up to 16 MHz with 16 MIPS throughput, packaged in a 64-lead VFQFN (9x9 mm) with exposed thermal pad. The device offers 54 programmable I/O lines, 32 general-purpose working registers, and a rich peripheral set including four USARTs, one TWI (I2C) port, one SPI port, two 8-bit timer/counters and four 16-bit timer/counters with compare/PWM modes, an 8-channel 10-bit ADC, a JTAG debug interface, and a programmable watchdog timer with separate on-chip oscillator.
An AVR microcontroller (sometimes called an Advanced Virtual RISC microcontroller) is a single-chip computer built around the Atmel AVR 8-bit RISC core, executing most instructions in a single clock cycle to deliver deterministic throughput. ATmega2561 belongs to the megaAVR family, sitting between tinyAVR and XMEGA in Microchip's 8-bit hierarchy, and is commonly used where higher pin count and larger memory are needed without moving to 32-bit ARM Cortex-M parts.
Key features of the ATMEGA2561-16MU include 256 KB self-programmable Flash with Read-While-Write support, 8 KB on-chip SRAM, 4 KB true EEPROM with 100,000 erase/write cycles endurance, an internal calibrated RC oscillator, and six software-selectable power-saving modes that can reduce active current to microampere levels for battery-operated designs. The 8-channel 10-bit successive-approximation ADC delivers up to 15 kSPS at full resolution, and the on-chip analog comparator supports single-ended and differential inputs with selectable hysteresis.
Architecturally, the ATMEGA2561 uses a Harvard-style memory layout with separate program Flash and data SRAM buses, a hardware multiplier supporting signed/unsigned multiply and fractional multiply instructions, and a deterministic interrupt controller with up to 57 interrupt vectors. The peripheral interconnect allows timer/counter outputs to drive ADC triggers and PWM channels, enabling motor control and power-conversion topologies without software overhead.
Typical applications include industrial automation controllers, building automation gateways, smart energy metering, USB-to-UART bridges using external PHY, multi-channel data acquisition front-ends, robotic controller boards, automotive body and infotainment subsystems (when properly qualified), and hobbyist/education platforms such as Arduino-Mega-compatible designs. The wide memory and I/O count also make it a frequent fit for SCADA remote terminal units (RTUs).
When designing with this device, ensure decoupling follows Microchip's recommended 100 nF ceramic on each VCC pin plus a 10 uF bulk, and respect the 5.5 V absolute-maximum VCC rating even though the part is 5 V tolerant. JTAG and ISP programming both require the RESET pin to remain in a defined state; for noise immunity, place a 10 kohm pull-up on RESET and a low-value decoupling capacitor on AVCC to maximize ADC linearity.
This page synthesizes distributor inventory, 64-QFN drop-in alternatives, and practical AVR design notes not found in the manufacturer datasheet alone, accelerating part selection and PCB re-use.
USD $11.83
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