DPU02 — USB-to-UART Bridge Controller

The DPU02 is a highly integrated single-chip USB-to-UART bridge that provides a simple, minimal-component solution for upgrading legacy RS-232 designs to USB. It integrates a USB 2.0 full-speed function controller, USB transceiver, oscillator, EEPROM, and a full-featured asynchronous UART with modem control signals — all in a compact 5×5 mm QFN-28 package, requiring no external USB components.

On-chip EEPROM allows customization of VID, PID, product string, power descriptor, revision, and serial number. Programming is performed in-system via USB, enabling configuration during manufacturing or debugging.

Virtual COM port drivers make a DPU02-based device appear as a standard COM port on the host PC. In most legacy RS-232 designs, upgrading to USB is as simple as replacing the RS-232 level shifter with the DPU02.

Key Features

Single-Chip USB-to-UART Data Transfer

• Integrated USB transceiver (no external resistors)

• Integrated clock (no external crystal)

• 1024-byte internal EEPROM for VID/PID/serial number/product strings

• On-chip power-on reset

• Integrated 3.3 V regulator

USB Function Controller

• Compliant with USB 2.0 Full-Speed (12 Mbps)

• Supports USB Suspend via SUSPEND pin

Asynchronous UART

• Full modem control signals

• Data bits: 5, 6, 7, 8

• Stop bits: 1, 1.5, 2

• Parity: odd, even, mark, space, none

• Baud rate: 300 bps to 1 Mbps

• Hardware or X-On/X-Off flow control

• Event character and line-break support

Virtual COM Port Drivers

• Windows 11/10/8/7/Vista/Server 2003/XP/2000

• macOS X / OS 9

• Linux

• Windows CE

Power Supply

• Self-powered: 3.0–3.6 V

• Bus-powered: 4.0–5.25 V

Package & Temperature

• RoHS-compliant 28-pin QFN (5×5 mm)

• –40°C to +85°C

Applications

• Upgrading legacy RS-232 devices to USB

• USB interface cables for cellular phones

• USB-to-RS-232 serial adapters

• Industrial and consumer USB-to-serial solutions