AVR64DU28T-I/STX

Overview

The AVR64DU28T-I/STX is an 8-bit microcontroller from the AVR DU family, featuring a 24 MHz AVR CPU with hardware multiplier. It includes 64 KB of Flash memory with read-while-write capability, 8 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 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-compliant interface for crystal-less operation when tuned to Start-of-Frames.
• Features Program and Debug Interface Disable (PDID) to prevent unauthorized access to reprogrammable Flash memory over UPDI.
• Includes Configurable Custom Logic (CCL) with four programmable Look-up Tables for independent inter-peripheral signaling.
• Supports automated Cyclic Redundancy Check (CRC) Flash memory scanning for data integrity verification.

Applications

• Firmware upgrades requiring secure boot code sections and cryptographic key validation.
• Applications utilizing USB connectivity without external crystals.
• Industrial control systems operating in extended temperature ranges.
• Devices requiring simultaneous host and client I2C operations.

Procurement Notes

Verify that the component matches the preliminary datasheet DS40002548A specifications. Confirm the package style corresponds to the 28-pin VQFN variant indicated by the STX suffix. Ensure the temperature grade aligns with the industrial rating required for the specific deployment environment.

Selection Notes

Select this model for designs requiring integrated USB functionality alongside standard serial interfaces. Consider the 64 KB Flash capacity for complex applications needing substantial program storage. Evaluate the 28-pin footprint constraints against the available GPIO count and peripheral requirements.

Part Context

This component belongs to the AVR DU family, which offers vertical migration compatibility across pin counts. It shares architectural similarities with other AVR devices but introduces advanced digital peripherals like the Event System and USB controller. The family emphasizes low-power operation and flexible I/O configurations.

Replacement Considerations

AVR32DU28T-I/STX

FAQ

What is the function of the PDID feature?

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

Can the USB interface operate without an external crystal?

Yes, the OSCHF oscillator can be tuned to the USB Start-of-Frames (SOFs) to enable crystal-less operation, provided the VDD is above 3.0V.