XR21V1412 Просмотр технического описания (PDF) - Exar Corporation

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XR21V1412

2-CH FULL-SPEED USB UART

Exar Corporation 

XR21V1412

2-CH FULL-SPEED USB UART

JUNE 2009

REV. 1.0.0

GENERAL DESCRIPTION

The XR21V1412 (V1412) is an enhanced 2-channel

Universal Asynchronous Receiver and Transmitter

(UART) with a USB interface. The USB interface is

fully compliant to Full Speed USB 2.0 specification

that supports 12 Mbps USB data transfer rate. The

USB interface also supports USB suspend, resume

and remote wakeup operations.

The V1412 operates from an internal 48MHz clock

therefore no external crystal/oscillator is required like

previous generation UARTs. With the fractional baud

rate generator, any baud rate can accurately be

generated using the internal 48MHz clock.

The large 128-byte FIFO and 384-byte RX FIFO of

the V1412 helps to optimize the overall data

throughput for various applications. The Automatic

Transceiver Direction control feature simplifies both

the hardware and software for half-duplex RS-485

applications. If required, the multidrop (9-bit) mode

with automatic half-duplex transceiver control feature

further simplifies typical multidrop RS-485

applications.

The V1412 operates from a single 2.97 to 3.63 volt

power supply and has 5V tolerant inputs. The V1412

is available in a 32-pin QFN package.

Software drivers for Windows 2000, XP, Vista, and

CE, as well as Linux and Mac are supported for the

XR21V1412.

APPLICATIONS

• Portable Appliances

• External Converters (dongles)

• Battery-Operated Devices

• Cellular Data Devices

• Factory Automation and Process Controls

• Industrial applications

FEATURES

• USB 2.0 Compliant Interface

■ Supports 12 Mbps USB full-speed data rate

■ Supports USB suspend, resume and remote

wakeup operations

• Enhanced Features of each UART

■ Data rates up to 12 Mbps

■ Fractional Baud Rate Generator

■ 128 byte TX FIFO

■ 384 byte RX FIFO

■ 7, 8 or 9 data bits, 1 or 2 stop bits

■ Automatic Hardware (RTS/CTS or DTR/DSR)

Flow Control

■ Automatic Software (Xon/Xoff) Flow Control

■ Multidrop mode w/ Auto Half-Duplex

Transceiver Control

■ Multidrop mode w/ Auto TX Enable

■ Half-Duplex mode

■ Sleep Mode with Remote Wake-up

■ Selectable GPIO or Modem I/O

• Internal 48 MHz clock

• Single 2.97-3.63V power supply

• 5V tolerant inputs

• 32-pin QFN package

• Virtual COM Port drivers

■ Windows 2000, XP and Vista

■ Windows CE 4.2, 5.0, 6.0

■ Linux

■ Mac

Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510) 668-7000 • FAX (510) 668-7017 • www.exar.com

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