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Компоненты Описание

производитель

XR21V1414

4-CH FULL-SPEED USB UART

Exar Corporation 

XR21V1414

4-CH FULL-SPEED USB UART

PIN DESCRIPTIONS

REV. 1.1.0

Pin Description

NAME

48-QFN

PIN #

TYPE

DESCRIPTION

UART Channel A Signals

RXA

31

TXA

30

GPIOA0/RIA#

21

GPIOA1/CDA#

20

GPIOA2/DSRA#

17

GPIOA3/DTRA#

16

GPIOA4/CTSA#

7

GPIOA5/RTSA#

6

I

UART Channel A Receive Data or IR Receive Data. This pin has an inter-

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

mode.

O UART Channel A Transmit Data or IR Transmit Data.

I/O UART Channel A general purpose I/O or UART Ring-Indicator input

(active low) or Remote Wakeup Input (See ”Section 1.5.11, Remote

Wakeup” on page 14.). This pin has an internal pull-up resistor which

is disabled during suspend mode. If using this GPIO as an input, an exter-

nal pull-up resistor is required to minimize the power consumption in the

suspend mode.

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 dur-

ing 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.

I/O UART Channel A general purpose I/O or UART Data-Set-Ready input

(active low). See ”Section 1.5.5, Automatic DTR/DSR Hardware

Flow Control” 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 minimize the power consumption in

the suspend mode.

I/O UART Channel A general purpose I/O or UART Data-Terminal-Ready out-

put (active low). See ”Section 1.5.5, Automatic DTR/DSR Hard-

ware Flow Control” 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 minimize the power con-

sumption in the suspend mode.

I/O UART Channel A general purpose I/O or UART Clear-to-Send input

(active low). See ”Section 1.5.4, Automatic RTS/CTS Hardware

Flow Control” on page 12. 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.

I/O UART Channel A general purpose I/O or UART Request-to-Send output

(active low). See ”Section 1.5.4, Automatic RTS/CTS Hardware

Flow Control” on page 12. 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

9

I

UART Channel B Receive Data or IR Receive Data. This pin has an inter-

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

mode.

4

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