ATTINY861A-MU

Overview

The ATTINY861A-MU is an 8-bit AVR microcontroller featuring 8KB of In-System Programmable Flash, 512 bytes of EEPROM, and 512 bytes of SRAM. It operates at up to 20 MHz with a throughput of 20 MIPS. The device supports a supply voltage range of 1.8V to 5.5V and includes 16 programmable I/O lines. Key peripherals include an 11-channel 10-bit ADC, two timers/counters, three PWM outputs, and a Universal Serial Interface (USI).

Feature Summary

• Advanced RISC architecture executing most instructions in a single clock cycle for high efficiency.
• Non-volatile memory segments with high endurance ratings for Flash and EEPROM data retention.
• Integrated analog subsystem including a 10-bit ADC with differential channels and an on-chip temperature sensor.
• Supports debugWIRE on-chip debugging and multiple software-selectable power-saving sleep modes.

Applications

• Configurable 3-phase BLDC fan control systems using sensorless algorithms.
• Battery-powered embedded devices requiring low active and power-down current consumption.
• Applications utilizing capacitive touch sensing interfaces via QTouch Library integration.

Procurement Notes

Verify the specific speed grade suffix matches the required operating frequency for the target voltage. Confirm package availability as the MLF variant requires soldering the center pad to ground for mechanical stability. Check RoHS compliance status and ensure the ordering code corresponds to the exact memory configuration needed.

Selection Notes

Select this model when 8KB Flash and 512-byte SRAM are required within a compact 32-pad MLF package. Ensure the design supports the 1.8V to 5.5V operating range if powering from varying sources. Consider the 20 MHz maximum frequency limit when designing for high-speed processing tasks versus low-power idle applications.

Part Context

This component belongs to the ATtinyx61A family, which shares core architectural features but varies in memory sizes and package options. The ATTINY861A specifically provides the largest memory capacity within the standard pin-count variants. It utilizes the enhanced AVR RISC architecture common to Microchip's 8-bit MCU portfolio.

Replacement Considerations

Compatible substitutes include ATTINY461A-MU and ATTINY261A-MU, which offer reduced memory capacities but maintain identical pinouts and peripheral sets. Verify that the replacement part number suffix indicates the same MLF package type to ensure physical compatibility.