AVR32SD28-E/SS

Overview

The AVR32SD28-E/SS is an 8-bit microcontroller from the AVR SD series, featuring a dual-core lockstep CPU architecture with a maximum clock frequency of 20 MHz. It provides 32 KB of system-in-programmable flash memory equipped with Single Error Correction and Double Error Detection (SECDED) ECC, alongside 4 KB of SRAM and 256 bytes of EEPROM, all supported by error correction mechanisms. The device operates within a voltage range of 2.7 V to 5.5 V and includes advanced peripherals such as two ADCs, three comparators, two Zero-Crossing Detectors (ZCD), and two Watchdog Timers (WDT). Connectivity options include three USARTs, two SPI interfaces, and two TWI modules, housed in a 20-pin SSOP package.

Feature Summary

• Dual-core lockstep CPU configuration for enhanced functional safety compliance
• Hardware-based error detection via SECDED ECC on flash, SRAM, and EEPROM
• Integrated analog peripherals including programmable gain amplifiers and zero-crossing detection
• Advanced digital control features with configurable custom logic and event systems

Applications

• Automotive safety systems requiring ISO 26262 ASIL C compliance
• Industrial automation controllers demanding high reliability
• Medical devices with strict safety certification requirements
• Consumer electronics needing robust fault detection capabilities

Procurement Notes

Verify the specific suffix against official Microchip documentation to confirm temperature grade and packaging type. Ensure compatibility with existing design constraints regarding the 20-pin SSOP footprint and voltage levels. Cross-reference the latest datasheet revision for any updates to pin definitions or electrical characteristics before finalizing procurement orders.

Selection Notes

Select this component when functional safety standards such as IEC 61508 SIL 2 or ISO 26262 ASIL C are mandatory. The dual-core architecture and extensive ECC support make it suitable for applications where data integrity and processor reliability are critical. Consider the available peripheral count and voltage range to ensure alignment with system power and interface requirements.

Part Context

This microcontroller belongs to the AVR SD family, designed specifically for safety-critical applications. It combines standard AVR performance with hardware redundancy and error monitoring features. The series supports various pin counts and packages, offering flexibility for different form factors while maintaining consistent safety features across the lineup.

Replacement Considerations

Consult official substitution lists for compatible parts within the AVR SD family. Verify that alternative components maintain the same dual-core lockstep functionality and safety certifications. Ensure pinout and peripheral compatibility if replacing within the same package type.