AVR32DU20T-I/SS

Overview

The AVR32DU20T-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 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 interface, two USARTs, one SPI, one TWI/I2C, a 10-bit ADC with 11 channels, and multiple timers. 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 oscillator tuning.
• Provides secure firmware protection through Program and Debug Interface Disable (PDID) mechanisms.
• Features an Event System for predictable inter-peripheral signaling independent of CPU intervention.
• Includes Configurable Custom Logic (CCL) with programmable Look-up Tables for digital logic implementation.

Applications

• USB-enabled consumer electronics
• Industrial communication nodes
• Smart energy metering devices
• Low-power sensor interfaces

Procurement Notes

Verify the 'T' suffix indicates tape and reel packaging when ordering. Confirm the 'I' suffix corresponds to the industrial temperature range (-40°C to +85°C). Ensure the SSOP-20 package style matches your PCB footprint requirements. Cross-reference the datasheet DS40002576A for final pinout and electrical specifications before integration.

Selection Notes

Select this component for applications requiring integrated USB connectivity without external transceivers. Consider the 32 KB Flash and 4 KB SRAM limits for code size and runtime data needs. Evaluate the 10-bit ADC resolution against signal precision requirements. Verify that the 24 MHz maximum clock speed meets real-time processing demands.

Part Context

This part belongs to the AVR DU family, which offers vertical migration compatibility across different pin counts and memory sizes. It shares architectural similarities with other AVR 8-bit controllers but introduces advanced features like the Event System and CCL. The device is designed for cost-sensitive applications requiring robust peripheral integration in compact packages.

Replacement Considerations

AVR32DU20-I/SS (Tube packaging variant)

FAQ

Does the USB interface require an external crystal?

No, 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 PDID?

Program and Debug Interface Disable (PDID) prevents access to the reprogrammable Flash memory over the UPDI, protecting against unauthorized code modification or reading.