AVR16DU28-I/STX

Overview

The AVR16DU28-I/STX is an 8-bit microcontroller from the AVR DU family, featuring a 16 KB Flash memory, 2 KB SRAM, and 256 bytes of EEPROM. It operates at clock speeds up to 24 MHz with a supply voltage range of 1.8 V to 5.5 V. The device includes a USB 2.0 full-speed interface, two USARTs, one SPI, and one TWI/I2C controller. It provides up to 21 programmable GPIO pins in a 28-pin package.

Feature Summary

• Integrated USB 2.0 full-speed device interface supporting crystal-less operation via oscillator tuning
• Configurable Custom Logic (CCL) with four Look-up Tables for independent peripheral signaling
• Program and Debug Interface Disable (PDID) mechanism for secure firmware protection
• Single-pin Unified Program and Debug Interface (UPDI) for programming and debugging

Applications

• USB-enabled embedded control systems
• Industrial communication nodes requiring RS-485 or LIN client support
• Low-power applications utilizing multiple sleep modes
• Secure firmware upgrade implementations using Boot Code section

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm package type and temperature range. Ensure compatibility with development tools such as MPLAB X IDE and XC8 compiler. Confirm that the component meets required environmental standards for the intended application environment before finalizing procurement.

Selection Notes

Select this model when a balance of moderate Flash capacity and integrated USB connectivity is required within a compact 28-pin footprint. Consider vertical migration options within the AVR DU family if future projects demand increased memory or pin counts without code modification. Evaluate power consumption requirements against the available idle, standby, and power-down modes.

Part Context

This component belongs to the AVR DU family of microcontrollers, which share a common architecture and peripheral set across various pin counts and memory sizes. The family emphasizes low-power operation and flexible I/O configurations. Devices in this series are designed for easy migration between different package types while maintaining software compatibility.

Replacement Considerations

AVR32DU28-I/STX

FAQ

What is the maximum operating frequency of the AVR16DU28-I/STX?

The device supports clock speeds up to 24 MHz.

Does the AVR16DU28-I/STX support crystal-less USB operation?

Yes, the OSCHF oscillator can be tuned to the USB Start-of-Frames (SOFs) to enable crystal-less operation.

How many general-purpose I/O pins are available on this device?

The device provides up to 21 programmable GPIO pins.