AVR32DU20-I/REB

Overview

The AVR32DU20-I/REB is an 8-bit microcontroller from the AVR DU family, featuring a 24 MHz AVR CPU with hardware multiplier. It includes 32 KB of Flash memory with read-while-write capability, 4 KB of SRAM, and 256 bytes of EEPROM. The device operates within a 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 with 11 channels, and four CCL LUTs. It utilizes a single-pin UPDI for programming and debugging.

Feature Summary

• Integrates a USB 2.0 full-speed device interface supporting crystal-less operation via OSCHF tuning.
• Provides Program and Debug Interface Disable (PDID) for secure firmware protection against unauthorized access.
• Features Configurable Custom Logic (CCL) with four Look-up Tables for independent peripheral signaling.
• Supports vertical migration across the AVR DU family without code modification due to pin and feature compatibility.

Applications

• USB-enabled embedded devices requiring full-speed communication.
• Industrial control systems operating in extended temperature environments.
• Applications requiring secure firmware updates with boot code protection.
• Low-power designs utilizing multiple sleep modes and event-driven architectures.

Procurement Notes

Verify the specific ordering suffix REB corresponds to the required tape and reel packaging configuration. Confirm that the I/ designation matches the intended industrial temperature range requirements for your application environment. Ensure compatibility with existing design tools and verify that the preliminary datasheet status does not impact final production specifications.

Selection Notes

Select this component when a balance of USB connectivity and robust security features is required in a compact 20-pin package. Consider the AVR32DU20 variant if 32 KB of Flash and 4 KB of SRAM meet system memory constraints. Evaluate the availability of the SSOP or VQFN packages based on PCB layout constraints and thermal management needs.

Part Context

This part belongs to the AVR DU family, which shares architectural similarities with other AVR microcontrollers but introduces advanced digital peripherals like the Event System and CCL. The DU series emphasizes low power consumption and high performance relative to its clock speed, targeting cost-sensitive applications that previously required more complex controllers.

Replacement Considerations

AVR32DU14-I/REB

FAQ

Does the USB interface require an external crystal?

No, the OSCHF oscillator can be tuned to the USB Start-of-Frames (SOFs) to enable crystal-less operation, provided the supply voltage is above 3.0V.

How is firmware security enforced after deployment?

Security is enforced via the Program and Debug Interface Disable (PDID) mechanism, which prevents UPDI access to reprogrammable Flash memory, allowing updates only through protected Boot Code sections.