ATTINY85-20SH

Overview

The ATTINY85-20SH 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 10-bit ADC with four single-ended channels, two timer/counters, and a Universal Serial Interface. It utilizes an EIAJ SOIC (8S2) package.

Feature Summary

• Advanced RISC architecture executing most instructions in a single clock cycle for high throughput efficiency.
• Non-volatile memory supports 10,000 write/erase cycles for Flash and 100,000 cycles for EEPROM.
• Integrated peripheral features include a 10-bit ADC, analog comparator, and programmable watchdog timer.
• Supports low power consumption through selectable Idle, ADC Noise Reduction, and Power-down modes.

Applications

• In-system programming via SPI interface
• On-chip debug system using debugWIRE
• Temperature measurement applications

Procurement Notes

Verify the specific ordering suffix against official Microchip documentation to confirm package type and lead finish specifications. Ensure the component matches the required industrial temperature range and speed grade for your design constraints. Cross-reference the datasheet revision to confirm compatibility with existing firmware and hardware designs.

Selection Notes

Select this model when an 8-pin surface-mount solution is required for space-constrained designs. The SH suffix indicates the EIAJ SOIC package variant. Consider the 20 MHz speed grade relative to the operating voltage requirements specified in the electrical characteristics section of the datasheet.

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, differentiated primarily by its 8 KB Flash memory capacity. The device is designed for applications requiring efficient code execution and low power operation.

Replacement Considerations

ATtiny85-20SU

FAQ

What is the pin configuration for Port B?

Port B consists of six bi-directional I/O lines (PB5:PB0) that also serve functions such as ADC inputs, reset, and serial interface signals.

How is the program memory programmed?

The Flash program memory can be re-programmed In-System through an SPI serial interface or by boot code running on the AVR core.

What are the available power saving modes?

The device offers three software selectable power saving modes: Idle, ADC Noise Reduction, and Power-down.