ATTINY861A-XU

Overview

The ATTINY861A-XU is an 8-bit microcontroller from the ATtinyx61A family, featuring a tinyAVR core. It provides 8 kB of Flash program memory, 512 B of SRAM, and 512 B of EEPROM. The device supports a maximum clock frequency of 10 MHz and operates within a supply voltage range of 1.8 V to 5.5 V. It includes 16 I/O pins, an 11-channel 10-bit ADC, two timers/counters, and interfaces including SPI, USI, and 2-Wire. The component is housed in a VQFN-32 package with a through-hole installation style option.

Feature Summary

• Supports sensorless control for configurable three-phase BLDC fan applications via specific firmware implementations.
• Integrates an 11-channel 10-bit analog-to-digital converter for precise signal acquisition.
• Offers flexible connectivity through SPI, USI, and 2-Wire interface protocols.

Applications

• Configurable three-phase brushless DC (BLDC) fan systems
• Sensorless motor control implementations
• Low-power embedded data acquisition tasks

Procurement Notes

Verify the exact suffix configuration against official Microchip documentation to ensure correct package type and temperature rating. Confirm availability status as distribution channels may list obsolete or NRND statuses. Cross-reference datasheet revisions to validate pinout compatibility and electrical characteristics before integration into final designs.

Selection Notes

Select this component when an 8-bit AVR architecture with integrated ADC and multiple communication interfaces is required. Ensure the VQFN-32 package fits the PCB layout constraints. Verify that the 10 MHz processing speed meets the real-time control requirements for the intended application, particularly for BLDC motor driving tasks.

Part Context

This part belongs to the ATtinyx61A series, which expands upon the previous ATtinyx61 generation with enhanced features. The series targets cost-sensitive applications requiring moderate memory capacity and robust peripheral sets. The X-series designation typically indicates specific package and temperature grade variations within the broader product line.

Replacement Considerations

Check for direct cross-references within the ATtinyx61A family. Verify if older ATtiny861 variants are compatible regarding pinout and software. Consult Microchip's official obsolescence notices for alternative recommendations if this specific SKU is discontinued.