ATTINY85-20SU

Overview

The ATTINY85-20SU is an 8-bit AVR microcontroller featuring 8 KB of in-system programmable Flash, 512 bytes of EEPROM, and 512 bytes of SRAM. It operates at a maximum clock frequency of 20 MHz with a supply voltage range of 2.7 V to 5.5 V. The device includes a 4-channel 10-bit ADC, two 8-bit timers/counters, and a Universal Serial Interface (USI). It utilizes an 8-pin SOIC package and supports industrial temperature ranges.

Feature Summary

• Advanced RISC architecture executing most instructions in a single clock cycle for high throughput efficiency.
• Integrated non-volatile memory systems including ISP Flash, EEPROM, and SRAM with data security lock bits.
• Comprehensive peripheral set comprising multi-channel ADC, dual timer/counters with PWM capabilities, and USI communication interface.

Applications

• Battery-powered embedded control systems requiring low power consumption
• Sensor interfaces utilizing the integrated analog-to-digital converter
• Simple serial communication nodes using the Universal Serial Interface

Procurement Notes

Verify the specific ordering code against the manufacturer's official documentation to ensure correct speed grade and package configuration. Confirm that the component meets required environmental standards and lead finish specifications before integration into production designs.

Selection Notes

Select this model when 8 KB of program memory is required within an 8-pin footprint. Ensure the application voltage remains above 2.7 V to support the 20 MHz speed grade. Consider alternative packages if tape and reel packaging or different lead finishes are necessary for the assembly process.

Part Context

This component belongs to the ATtiny family of 8-bit AVR microcontrollers manufactured by Microchip Technology. It shares architectural similarities with the ATtiny25 and ATtiny45, differing primarily in memory capacity. The series is designed for cost-sensitive applications demanding efficient processing in compact form factors.

Replacement Considerations

Direct substitutes include ATTINY85-10SU for lower speed requirements and ATTINY85V-20SU for extended voltage operation. Verify pin compatibility and memory sizes when considering cross-series replacements from the same manufacturer.

FAQ

What is the function of the USI peripheral?

The Universal Serial Interface (USI) supports standard SPI and I2C compatible communication protocols, allowing flexible data exchange with external devices.

How does the device handle power management?

It offers three software-selectable power-saving modes: Idle, ADC Noise Reduction, and Power-down, which disable various components to minimize current consumption.

Is on-chip debugging supported?

Yes, the device includes a debugWIRE system that enables in-circuit debugging and programming via a single I/O pin using the SPI interface.