XR21V1412IL32-F 查看數據表（PDF） - Exar Corporation

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XR21V1412IL32-F

2-CH FULL-SPEED USB UART

Exar Corporation 

XR21V1412

2-CH FULL-SPEED USB UART

PIN DESCRIPTIONS

REV. 1.3.0

NAME

32-QFN

PIN #

TYPE

DESCRIPTION

UART Channel A Signals

RXA

6

I UART Channel A Receive Data or IR Receive Data. This pin has an internal pull-up

resistor. Internal pull-up resistor is not disabled during suspend mode.

TXA

5

O UART Channel A Transmit Data or IR Transmit Data.

GPIOA0/RIA#/

12

I/O UART Channel A general purpose I/O or UART Ring-Indicator input (active low) or

RWKA#

Remote Wakeup Input (See ”Section 1.5.13, Remote Wakeup” on

page 13.). This pin has an internal pull-up resistor which is disabled during suspend

mode. If using this GPIO as an input, an external pull-up resistor is required to mini-

mize the power consumption in the suspend mode.

GPIOA1/CDA#

11

I/O UART Channel A general purpose I/O or UART Carrier-Detect input (active low).

This pin has an internal pull-up resistor which is disabled during suspend mode. If

using this GPIO as an input, an external pull-up resistor is required to minimize the

power consumption in the suspend mode.

GPIOA2/DSRA# 10

I/O UART Channel A general purpose I/O or UART Data-Set-Ready input (active low).

See ”Section 1.5.6, Automatic DTR/DSR Hardware Flow Control” on

page 11. This pin has an internal pull-up resistor which is disabled during suspend

mode. If using this GPIO as an input, an external pull-up resistor is required to mini-

mize the power consumption in the suspend mode.

GPIOA3/DTRA# 9

I/O UART Channel A general purpose I/O or UART Data-Terminal-Ready output (active

low). See ”Section 1.5.6, Automatic DTR/DSR Hardware Flow Control”

on page 11. This pin has an internal pull-up resistor which is disabled during sus-

pend mode. If using this GPIO as an input, an external pull-up resistor is required to

minimize the power consumption in the suspend mode.

GPIOA4/CTSA#

8

I/O UART Channel A general purpose I/O or UART Clear-to-Send input (active low).

See ”Section 1.5.5, Automatic RTS/CTS Hardware Flow Control” on

page 11. This pin has an internal pull-up resistor which is disabled during suspend

mode. If using this GPIO as an input, an external pull-up resistor is required to mini-

mize the power consumption in the suspend mode.

GPIOA5/RTSA#/ 7

RS485A

I/O UART Channel A general purpose I/O or UART Request-to-Send output (active low)

or auto RS-485 half-duplex control. See ”Section 1.5.5, Automatic RTS/CTS

Hardware Flow Control” on page 11. This pin has an internal pull-up resistor

which is disabled during suspend mode. If using this GPIO as an input, an external

pull-up resistor is required to minimize the power consumption in the suspend mode.

UART Channel B Signals

RXB

16

I UART Channel B Receive Data or IR Receive Data. This pin has an internal pull-up

resistor. Internal pull-up resistor is not disabled during suspend mode.

TXB

15

O UART Channel B Transmit Data or IR Transmit Data.

GPIOB0/RIB#/

22

I/O UART Channel B general purpose I/O or UART Ring-Indicator input (active low) or

RWKB#

Remote Wakeup Input (See ”Section 1.5.13, Remote Wakeup” on

page 13.). This pin has an internal pull-up resistor which is disabled during suspend

mode. If using this GPIO as an input, an external pull-up resistor is required to mini-

mize the power consumption in the suspend mode.

4

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