XR21V1412_10 Datasheet, PDF (4/30 Pages) Exar Corporation – 2-CH FULL-SPEED USB UART

XR21V1412
2-CH FULL-SPEED USB UART
PIN DESCRIPTIONS
REV. 1.1.0
Pin Description
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}
Remote Wakeup Input (See ”Section 1.5.11, Remote Wakeup” 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.
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 1.5.5, 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 1.5.5, 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 1.5.4, Automatic RTS/CTS Hardware Flow Control” on
page 10. 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
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 10. 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.
UART Channel B Signals
RXB
16
TXB
15
GPIOB0/RIB#
22
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.
O _{UART Channel B Transmit Data or IR Transmit Data.}
I/O _{UART Channel B general purpose I/O or UART Ring-Indicator 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.
4