ATTINY25-20SUR

Overview

The ATTINY25-20SUR is an 8-bit microcontroller based on the AVR RISC architecture, manufactured by Microchip Technology (formerly Atmel). It features 2 KB of In-System Programmable Flash memory, 128 bytes of EEPROM, and 128 bytes of SRAM. The device operates with a maximum clock frequency of 20 MHz and supports a supply voltage range of 2.7 V to 5.5 V. It includes four 10-bit ADC channels, six general-purpose I/O lines, and a USI interface for serial communication. The component is housed in an 8-pin SOIC package and functions within a temperature range of -40°C to 85°C.

Feature Summary

• AVR high-performance 8-bit RISC core delivering nearly 1 MIPS per MHz for efficient code execution.
• In-system programmable Flash memory allowing non-volatile program storage and data retention without power.
• Integrated analog-to-digital converter with four channels providing 10-bit resolution for sensor interfacing.
• Universal Serial Interface (USI) supporting standard SPI and I2C protocol operations.

Applications

• Battery-powered consumer devices requiring low power consumption and compact packaging.
• Simple industrial control systems utilizing the USI interface for peripheral communication.
• Smart home automation components needing reliable 8-bit processing capabilities.
• Educational development boards for AVR architecture learning.

Procurement Notes

Verify the suffix 'SUR' corresponds to the tape-and-reel packaging variant rather than the tube configuration when sourcing. Confirm the manufacturer designation as Microchip Technology, noting the historical Atmel branding may appear in legacy documentation. Ensure the operating voltage specifications align with the target system's power rails before integration.

Selection Notes

Select this component for applications requiring a balance of processing speed and minimal pin count. The 20 MHz maximum frequency suits simple logic control tasks. Consider the 8-pin SOIC package constraints for PCB layout. Evaluate the 2 KB Flash limit against firmware size requirements to ensure sufficient space for application code and updates.

Part Context

This part belongs to the ATtiny series of 8-bit microcontrollers designed for cost-sensitive and space-constrained embedded applications. The series emphasizes energy efficiency and ease of programming. The specific model integrates essential peripherals like ADC and USI while maintaining a small footprint, making it suitable for basic standalone control functions.

Replacement Considerations

Check for ATTINY25V-10SUR for lower voltage operation variants or ATTINY25-20SU for tube-packaged equivalents. Verify pin compatibility and software register mappings when substituting with other ATtiny family members to ensure seamless migration.