AVR16DU28-I/SS

Overview

The AVR16DU28-I/SS is an 8-bit microcontroller from the AVR DU family, featuring a 16 KB Flash memory, 2 KB SRAM, and 256 B 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, one TWI, a 10-bit ADC with 17 channels, and four CCL LUTs. It is housed in a 28-pin SSOP package and supports industrial temperatures from -40°C to +85°C.

Feature Summary

• Integrates a USB 2.0 full-speed device interface for crystal-less operation via OSCHF tuning.
• Provides multi-voltage I/O capability supporting 1.8V to 5.5V logic levels.
• Includes Configurable Custom Logic (CCL) with four Look-up Tables for custom digital functions.
• Features Program and Debug Interface Disable (PDID) for secure firmware protection.

Applications

• USB-enabled embedded control systems
• Industrial communication nodes using RS-485 or LIN client modes
• Battery-powered devices requiring low-power sleep modes
• Applications needing secure code execution with PDID

Procurement Notes

Verify the datasheet revision DS40002576A as the document is marked Preliminary. Confirm that the 'I' suffix denotes the industrial temperature range (-40°C to +85°C). Ensure the SSOP package style matches the target PCB footprint. Check for any specific ordering suffixes regarding tape and reel versus tube packaging if applicable.

Selection Notes

Select this component when a balance of moderate Flash capacity and integrated USB connectivity is required. The 16 KB Flash size suits applications not needing extensive code storage. Consider the 28-pin SSOP package for through-hole or surface-mount assembly constraints. Evaluate the 10-bit ADC resolution against signal precision requirements.

Part Context

This part belongs to the AVR DU family, which shares pin and feature compatibility across 14, 20, 28, and 32-pin variants. It utilizes the AVR CPU with a hardware multiplier. The family emphasizes low power consumption and flexible analog peripherals. Vertical migration within the family allows code reuse across different memory sizes.

FAQ

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.

What is the function of the PDID fuse?

Program and Debug Interface Disable (PDID) prevents access to the reprogrammable Flash memory over the UPDI, protecting the device from unauthorized reading or erasing.