AVR64DU28-I/STX

Overview

The AVR64DU28-I/STX is an 8-bit microcontroller from the AVR DU family, featuring a hardware multiplier and operating at clock speeds up to 24 MHz. It includes 64 KB of in-system self-programmable Flash memory with read-while-write capability, 8 KB of SRAM, and 256 bytes of EEPROM. The device provides up to 24 programmable GPIO pins and supports a supply voltage range of 1.8V to 5.5V. Key peripherals include a USB 2.0 full-speed device interface, two USARTs, one SPI, one TWI, a 10-bit ADC, and an analog comparator.

Feature Summary

• Integrated USB 2.0 full-speed device interface supporting crystal-less operation via oscillator tuning
• Program and Debug Interface Disable (PDID) mechanism for secure firmware protection
• Configurable Custom Logic (CCL) with four Look-up Tables for independent peripheral signaling
• Automated Cyclic Redundancy Check (CRC) Flash memory scan for data integrity

Applications

• USB-enabled embedded control systems
• Industrial applications requiring secure firmware updates
• IoT devices utilizing multi-voltage I/O capabilities
• Battery-powered systems leveraging low-power sleep modes

Procurement Notes

Verify that the component matches the preliminary datasheet DS40002548A specifications. Confirm the package style corresponds to the STX suffix for VQFN-28. Ensure the temperature grade aligns with industrial requirements. Cross-reference the manufacturer part number to confirm authenticity before integration into production designs.

Selection Notes

Select this model when 64 KB of Flash and 8 KB of RAM are required within a 28-pin footprint. The integrated USB controller eliminates external transceivers for communication interfaces. Verify that the 1.8V to 5.5V operating range meets system power constraints. Consider the PDID feature if cryptographic security for bootloader operations is necessary.

Part Context

This component belongs to the AVR DU family, which offers vertical migration compatibility without code modification across pin counts. It shares architectural similarities with other AVR devices but adds advanced digital peripherals like the Event System and Configurable Custom Logic. The family targets applications needing high performance and security in compact packages.

Replacement Considerations

AVR32DU28-I/STX

FAQ

Does the USB function operate at all supply voltages?

No, the USB function is only available for VDD above 3.0V.

What is the purpose of the Program and Debug Interface Disable (PDID)?

PDID prevents access to the device's reprogrammable Flash memory over the UPDI, protecting against unauthorized modifications after activation.