AVR32EA28T-I/SS

Overview

The AVR32EA28T-I/SS is an 8-bit microcontroller from Microchip Technology, featuring a 20 MHz AVR core. It integrates 32 kB of Flash program memory and 4 kB of SRAM data memory within a 28-pin SSOP package. Key peripherals include a 12-bit ADC with PGA, two comparators, a DAC, three USARTs, SPI, and TWI interfaces. The device operates on a supply voltage ranging from 1.8 V to 5.5 V and supports an industrial temperature range of -40°C to +85°C.

Feature Summary

• Integrates a 12-bit Analog-to-Digital Converter with Programmable Gain Amplifier for precise signal acquisition.
• Includes hardware Zero-Crossing Detection (ZCD) modules suitable for AC mains monitoring applications.
• Features Multi-Voltage I/O capability allowing mixed voltage operation on input/output pins.

Applications

• Smart metering and utility monitoring systems
• Industrial control devices requiring isolated or high-voltage sensing
• Battery-powered equipment with multi-supply requirements

Procurement Notes

Verify the specific suffix 'I' indicates the industrial temperature grade (-40°C to +85°C). Confirm the 'SS' suffix corresponds to the SSOP-28 plastic package. Ensure the 'T' designation matches the required tape-and-reel packaging format for automated assembly processes.

Selection Notes

Select this component when a balance of analog precision and digital connectivity is required in a compact form factor. The inclusion of ZCD and PGA makes it distinct from standard AVR counterparts lacking these specific analog front-end features. Consider pin count constraints as the 28-pin package limits available GPIO compared to larger packages in the same series.

Part Context

This part belongs to the AVR EA family, which emphasizes analog performance and robustness. It shares architectural similarities with the AVR DA and DB families but offers a different peripheral mix optimized for cost-sensitive industrial applications. The 32 kB Flash size positions it between smaller entry-level MCUs and higher-capacity models like the AVR64DA.

Replacement Considerations

Direct substitutes within the same package and pinout may include other variants from the AVR EA series with matching memory sizes, such as AVR32EA28T-E/SS, provided the temperature grade difference is acceptable. Cross-family replacements require careful schematic review due to potential differences in register maps and peripheral configurations.