AVR64EA28-I/STX

Overview

The AVR64EA28-I/STX is an 8-bit microcontroller from the AVR EA series, featuring a 28-pin VQFN package. It operates with an AVR CPU core at clock frequencies up to 20 MHz and supports a supply voltage range of 1.8V to 5.5V. The device includes 64kB of system-in-programmable flash memory, 6kB of SRAM, and 512B of EEPROM. Key peripherals include a 12-bit ADC with PGA, a 10-bit DAC, three USARTs, SPI, TWI, and an event system for low-power operation.

Feature Summary

• Integrates a hardware multiplier-enabled AVR CPU for efficient real-time control processing
• Features a high-precision analog subsystem with a 12-bit differential ADC and programmable gain amplifier
• Supports flexible peripheral interconnection via an Event System and Configurable Custom Logic
• Provides versatile communication interfaces including multiple USARTs, SPI, and dual-mode TWI

Applications

• Industrial sensor nodes requiring precise signal measurement
• Secondary safety monitoring equipment
• Closed-loop control systems
• Consumer appliance motor control

Procurement Notes

Verify the specific suffix 'STX' against official Microchip documentation to confirm the exact tape-and-reel packaging configuration and quantity per reel. Ensure the industrial temperature grade (-40°C to +85°C) matches the application environment requirements. Cross-reference the datasheet revision date to ensure compatibility with current design tools and libraries.

Selection Notes

Select this component when a balance of moderate flash capacity and advanced analog features is required in a compact 28-pin form factor. The inclusion of a 12-bit ADC with PGA makes it suitable for noisy environments where signal integrity is critical without external amplification. Consider the 20 MHz maximum speed for applications that do not require higher-frequency processing found in larger pin-count variants.

Part Context

This part belongs to the AVR EA family, which emphasizes low power consumption and integrated analog capabilities. Unlike standard AVR devices, the EA series incorporates Core Independent Peripherals (CIP) and an Event System to offload tasks from the CPU. The 28-pin variant offers a cost-effective solution for designs constrained by board space while maintaining access to essential serial interfaces and timers.

Replacement Considerations

AVR64EA28-E/STX: Offers extended temperature range capability compared to the industrial grade variant.