ATTINY861-20SUR

Overview

The ATTINY861-20SUR is an 8-bit AVR microcontroller featuring 8K bytes of In-System Programmable Flash, 256 bytes of EEPROM, and 256 bytes of SRAM. It operates at clock speeds up to 20 MHz with a supply voltage range of 2.7V to 5.5V. The device includes an 11-channel 10-bit ADC, three high-frequency PWM outputs, and a Universal Serial Interface (USI). Packaged in a 20-pin SOIC, it supports industrial temperature ranges and offers multiple low-power operating modes.

Feature Summary

• Advanced RISC architecture executing most instructions in a single clock cycle for high throughput efficiency.
• Integrated non-volatile memory with high endurance specifications for program storage and data retention.
• Comprehensive peripheral set including multi-channel ADC, analog comparator, and programmable timers.
• Supports in-system programming via SPI and on-chip debug capabilities through the debugWIRE interface.

Applications

• Configurable three-phase BLDC fan control systems
• Industrial sensor interfaces requiring analog signal processing
• Low-power embedded controllers with serial communication needs

Procurement Notes

Verify the specific suffix 'SUR' corresponds to the tape and reel packaging format required for automated assembly processes. Confirm that the 20-pin SOIC package dimensions align with the target PCB footprint. Ensure the component meets the necessary environmental compliance standards for the intended deployment region.

Selection Notes

Select this variant when 8K bytes of program memory are required alongside robust analog input capabilities. The 20MHz speed grade suits applications needing faster instruction execution than lower-speed variants provide. Consider the 2.7V minimum operating voltage for battery-powered designs where power management is critical.

Part Context

This component belongs to the ATtiny461/861 family within Microchip's AVR portfolio. It shares architectural similarities with the ATtiny261 but offers increased memory capacity. The device utilizes the standard AVR enhanced RISC core, ensuring compatibility with existing development tools and software libraries designed for the series.

Replacement Considerations

Direct substitutes include the ATtiny461-20SUR for reduced memory requirements or the ATtiny261-20SUR for further size optimization. Verify pinout compatibility and memory mapping differences before swapping between these family members to ensure firmware integrity.