AVR32SD28-I/SP

Overview

The AVR32SD28-I/SP is an 8-bit microcontroller from Microchip Technology, featuring the AVR CPU core with a hardware multiplier and operating at clock speeds up to 20MHz. It utilizes a SPDIP-28 package and supports a supply voltage range of 2.7V to 5.5V. The device includes 32KB of system-in-programmable flash memory with ECC, 4KB of SRAM with ECC, and 256 bytes of EEPROM with ECC. It provides up to 25 programmable I/O pins and integrates advanced peripherals such as a 12-bit timer (TCD), event system, and single-pin UPDI interface.

Feature Summary

• Dual-core lockstep (DCLS) configuration for enhanced functional safety
• Single-cycle I/O access for efficient peripheral control
• Built-in error correction codes (ECC) across NVM and SRAM
• Integrated high-frequency timer optimized for power control applications

Applications

• Automotive safety systems requiring ISO 26262 compliance
• Industrial automation controllers
• Medical equipment with strict reliability standards
• Consumer electronics with security requirements

Procurement Notes

Verify the specific suffix 'I/SP' corresponds to the industrial temperature range (-40°C to +85°C) and SPDIP-28 through-hole package. Confirm that the component meets the required functional safety standards, such as ISO 26262 ASIL C or IEC 61508 SIL 2, for your intended application environment. Ensure compatibility with existing design tools and programming interfaces.

Selection Notes

Select this model when dual-core lockstep processing and robust error detection are critical for system integrity. It is suitable for designs needing secure boot capabilities via PDID and precise timing control through the TCD peripheral. Consider the 28-pin SPDIP form factor for prototyping or applications requiring through-hole mounting.

Part Context

This part belongs to the AVR32 SD series, designed specifically for safety-critical applications. It combines standard AVR architecture with advanced fault-tolerance features like SECDED ECC and an error controller. The series supports various pin counts, with the 28-pin variant offering a balance of I/O density and package size.

Replacement Considerations

Check for other variants within the AVR32 SD family, such as different pin counts or package types, if physical footprint changes are acceptable. Verify that any substitute maintains the same safety certification levels and peripheral set, particularly the DCLS core and TCD timer.