ATTINY426-SF

Overview

The ATtiny426-SF is an 8-bit microcontroller from the Microchip tinyAVR 2 family, utilizing the AVR CPU with a hardware multiplier. It features 8 KB of Flash memory, 1 KB of SRAM, and 128 B of EEPROM. The device supports a maximum clock frequency of 20 MHz and operates within a supply voltage range of 1.8 V to 5.5 V. It includes a 12-bit differential ADC with PGA, up to 18 general-purpose I/O pins, and multiple communication interfaces including USART, SPI, and TWI. The 'SF' suffix indicates a -40°C to +125°C temperature range in a SOIC package.

Feature Summary

• Features a high-performance low-power AVR CPU running at up to 20 MHz with single-cycle I/O access and a two-cycle hardware multiplier.
• Includes advanced analog peripherals such as a 12-bit differential ADC with Programmable Gain Amplifier (PGA) and up to 15 input channels.
• Supports flexible inter-peripheral signaling through an Event System and Configurable Custom Logic (CCL) with four programmable Look-Up Tables.
• Provides versatile connectivity options with dual USARTs, host/client SPI, and TWI interfaces supporting standard, fast, and fast mode plus speeds.

Applications

• Industrial control systems requiring extended temperature operation
• Battery-powered devices utilizing low-power sleep modes
• Sensor interface applications leveraging the differential ADC and PGA
• Communication nodes using USART or TWI protocols

Procurement Notes

Verify the specific ordering suffix to confirm package type and temperature range. The 'S' denotes SOIC packaging, while 'F' indicates an extended temperature range of -40°C to +125°C. Ensure compatibility with existing board layouts regarding pin count and dimensions. Confirm that the selected variant meets all environmental and electrical specifications required for the target application environment.

Selection Notes

Select this component when 8 KB of program memory and 1 KB of data RAM are sufficient for the application logic. Choose this part over smaller variants if additional I/O lines or peripheral channels are needed. Consider the extended temperature rating if the operating environment exceeds industrial limits. Verify that the 20 MHz speed grade aligns with the system's power consumption constraints and voltage supply capabilities.

Part Context

This device belongs to the tinyAVR 2 family, which offers vertical migration compatibility without code modification across different pin counts and memory sizes within the series. It shares architectural similarities with other members like the ATtiny424 and ATtiny427 but provides a specific balance of memory and I/O resources. The family emphasizes low power consumption and integrated analog features for embedded control tasks.

Replacement Considerations

Direct replacements within the same family include ATtiny424-SF and ATtiny427-SF, provided pin compatibility and feature requirements are met. Horizontal migration may require schematic changes due to differing pin counts. Ensure that any substitute maintains the required temperature range and package style for physical integration.