Freescale Semiconductor

Data Sheet: Advance Information

Document Number: USB2SERDS

Rev. 0, 05/2011

© Freescale Semiconductor, Inc., 2011. All rights reserved.

This document contains information on a product under development. Freescale reserves the

right to change or discontinue this product without notice.

USB2SER

24-pin QFN

Case 1897

Introduction

The USB2SER is a USB to UART bridge controller on a

5x5mm lead free QFN24. It is a simple low cost solution to

enable a USB for an embedded system with a UART port,

reducing external component counts. It supports USB 2.0 full-

speed and TTL RS232 or RS485 UART with options for

hardware flow control, Software Flow control (Xon-Xoff),

even or odd parity, and stop bits configuration.

Features

•

Single chip USB to UART Data Transfer (RS232 or

RS485)

•

USB specification 2.0 compliant, full speed

(12 Mbps)

•

User programmable custom baud rates from 300 bps

to 115200 bps

•

UART supports 8 bit data, 1 or 2 stop bits and odd,

even or no parity

•

RESUME signal to request a remote wake-up and

SUSPEND output to indicate that the device is in

suspended mode

•

Integrated 3.3 V regulator for a USB IO

•

Integrated Power-On-Reset circuit

•

Integrated 2 MHz – 48 Mhz clock multiplier PLL

•

Supports 2 MHz, 4 MHz, 6 MHz, 8 MHz, 12 MHz,

and 16 MHz external crystals with automatic crystal

frequency detection

•

USB bulk data transfer modes for data

communication

•

3 V to 5 V single supply operation

•

UHCI / OHCI / EHCI host controller compatible

•

Configurable USB VID, PID, and device

description strings in the internal flash

•

Configurable password to protect the device from

additional parameter modifications

•

Data formats supported 8 bits data, 1 and 2 stop bits

•

Parity odd, even, no parity

•

Hardware flow control (RTC / CTS) or Software

Xon/Xoff flow control

•

RS485_TXEN signal to support RS485

•

USB and UART activity pins to indicate

communication activity and fail sequences

Drivers support

The USB2SER can act as a CDC standard device that

eliminates the need for custom drivers for operation when the

flow-control is not needed (only an INF file is required).

For flow control support, COM emulator drivers are available

for:

•

Windows XP 32-bits and 64-bits versions

•

Windows Vista 32-bits and 64-bits versions

•

Windows 7 32-bits and 64-bits versions

•

Linux Kernel 2.6.34 and higher

Additionally to the drivers, a software configuration tool is

provided to customize the Product ID, Vendor ID, Product

strings, current consumption parameters and password

protection option, to prevent further modifications to the

device information. For driver installation and software go to:

Package

USB2SER comes in a compact 5 x 5 mm Pb free RoHS

compliant QFN24.

USB2SER Data Sheet

USB to UART Application Specific

IC