ATTINY861A-MUR

Overview

The ATTINY861A-MUR 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 a maximum frequency of 20 MHz with throughput up to 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 a 10-bit ADC with 11 single-ended channels, two timers/counters, three PWM outputs, and a Universal Serial Interface.

Feature Summary

• Advanced RISC architecture executing most instructions in a single clock cycle for high efficiency.
• High endurance non-volatile memory segments with significant write/erase cycle ratings.
• Integrated analog subsystem including a 10-bit ADC with differential inputs and programmable gain.
• Comprehensive power management with multiple software-selectable sleep modes.

Applications

• Configurable 3-phase BLDC fan control implementing sensorless operation
• Low-power embedded systems requiring in-system programming via SPI
• Applications utilizing touch sensing interfaces via QTouch Library integration

Procurement Notes

Verify the specific speed grade required for your operating voltage, as performance varies between 4 MHz, 10 MHz, and 20 MHz ranges depending on the supply level. Confirm that the 32-pad MLF package with exposed pad is suitable for your PCB layout, ensuring the center pad is soldered to ground for mechanical stability. Check current availability status as product lifecycles may change.

Selection Notes

Select this model when 8KB of program memory is necessary, distinguishing it from the 2KB ATtiny261A and 4KB ATtiny461A variants. Ensure the design accommodates the 32-pin VQFN/MLF package constraints. Verify that the 1.8V minimum supply requirement aligns with your system's power rails, particularly if operating at higher frequencies which may require elevated voltages.

Part Context

This component belongs to the ATtinyx61A family, which shares core architectural features but differs in memory capacities. The 'MUR' suffix indicates a specific tape and reel packaging format for the 32-pad MLF variant. It utilizes the same AVR core and peripheral set as other members in the series, facilitating code portability across the family.

Replacement Considerations

ATtiny861A-MU

FAQ

How is the center pad of the MLF package handled?

To ensure mechanical stability, the center pad underneath the QFN/MLF package must be soldered to ground on the board.

What is the data retention specification for the internal memory?

The projected data retention failure rate is less than 1 PPM over 20 years at 85°C or 100 years at 25°C.

Can the device be programmed in-system?

Yes, the On-chip ISP Flash allows the Program memory to be re-programmed In-System through an SPI serial interface.