AVR32DU20-I/SS

Overview

The AVR32DU20-I/SS is an 8-bit microcontroller from the AVR DU family, featuring a 24 MHz AVR CPU with hardware multiplier. It includes 32 KB of in-system self-programmable Flash memory with read-while-write capability, 2 KB of SRAM, and 256 bytes of EEPROM. The device operates within a supply voltage range of 1.8 V to 5.5 V and supports industrial temperatures from -40°C to +85°C. Key peripherals include a USB 2.0 full-speed device interface, two USARTs, one SPI, one TWI/I²C, a 10-bit ADC, and an analog comparator.

Feature Summary

• Integrates a USB 2.0 full-speed device interface for crystal-less operation when tuned to Start-of-Frames.
• Provides Program and Debug Interface Disable (PDID) to prevent unauthorized access to reprogrammable Flash memory via UPDI.
• Supports simultaneous host and client operation on the Two-Wire Interface (TWI) using dual address match.
• Features an automated Cyclic Redundancy Check (CRC) scan for Flash memory integrity verification.

Applications

• USB-enabled embedded control systems
• Industrial communication nodes requiring RS-485 or LIN client modes
• Secure firmware upgrade implementations utilizing PDID
• Low-power applications leveraging multiple sleep modes

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm package type and temperature grade. Ensure that any required programming tools are compatible with the Unified Program and Debug Interface (UPDI). Confirm availability status as preliminary data sheets may indicate early production stages. Cross-reference pinouts with the specific datasheet revision to ensure compatibility with existing PCB layouts.

Selection Notes

Select this component for designs requiring integrated USB connectivity without external transceivers. Consider the 2 KB SRAM limit for complex application logic. Evaluate the need for the PDID security feature if protecting intellectual property is critical. Compare peripheral counts against larger variants in the DU family if additional I/O or memory is anticipated for future scalability.

Part Context

This part belongs to the AVR DU family, which offers vertical migration capabilities without code modification across different pin counts and memory sizes. The AVR32DU20 specifically provides a balance of processing power and peripheral density in a compact 20-pin SSOP package. It shares architectural similarities with other AVR devices but introduces advanced features like the Event System and Configurable Custom Logic.

Replacement Considerations

AVR16DU20-I/SS: Offers identical pinout and peripherals but with reduced 16 KB Flash memory.

FAQ

Can the USB interface operate without an external crystal?

Yes, the internal high-frequency oscillator can be tuned to the USB Start-of-Frames for crystal-less operation, provided the supply voltage is above 3.0V.

What is the function of the PDID fuse?

Program and Debug Interface Disable (PDID) prevents access to the device's reprogrammable Flash memory over the UPDI, protecting against remote attacks and unauthorized code modification.