XR21V1412 Datasheet, PDF (4/24 Pages) Exar Corporation – 2-CH FULL-SPEED USB UART

XR21V1412
2-CH FULL-SPEED USB UART
PIN DESCRIPTIONS
REV. 1.0.0
Pin Description
NAME
32-QFN
PIN #
TYPE
DESCRIPTION
UART Channel A Signals
RXA
6
TXA
5
GPIOA0/RIA#
12
GPIOA1/CDA#
11
GPIOA2/DSRA# ¹⁰
GPIOA3/DTRA# ⁹
GPIOA4/CTSA# ⁸
GPIOA5/RTSA# ⁷
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.
O _{UART Channel A Transmit Data or IR Transmit Data.}
I/O _{General purpose I/O or UART Ring-Indicator input (active low). This pin has an inter-}
nal pull-up resistor. Internal pull-up resistor is disabled during suspend mode. If
using this GPIO as an input, a pull-up resistor is required to minimize the power con-
sumption in the suspend mode.
I/O _{General purpose I/O or UART Carrier-Detect input (active low). This pin has an inter-}
nal pull-up resistor. Internal pull-up resistor is disabled during suspend mode. If
using this GPIO as an input, a pull-up resistor is required to minimize the power con-
sumption in the suspend mode.
I/O _{General purpose I/O or UART Data-Set-Ready input (active low). This pin has an}
internal pull-up resistor. Internal pull-up resistor is disabled during suspend mode. If
using this GPIO as an input, a pull-up resistor is required to minimize the power con-
sumption in the suspend mode.
I/O _{General purpose I/O or UART Data-Terminal-Ready output (active low). This pin has}
an internal pull-up resistor. Internal pull-up resistor is disabled during suspend mode.
If using this GPIO as an input, a pull-up resistor is required to minimize the power
consumption in the suspend mode.
I/O _{General purpose I/O or UART Clear-to-Send input (active low). This pin has an inter-}
nal pull-up resistor. Internal pull-up resistor is disabled during suspend mode. If
using this GPIO as an input, a pull-up resistor is required to minimize the power con-
sumption in the suspend mode.
I/O _{General purpose I/O or UART Request-to-Send output (active low). This pin has an}
internal pull-up resistor. Internal pull-up resistor is disabled during suspend mode. If
using this GPIO as an input, a pull-up resistor is required to minimize the power con-
sumption in the suspend mode.
UART Channel B Signals
RXB
16
TXB
15
GPIOB0/RIB#
22
GPIOB1/CDB# ²¹
GPIOB2/DSRB# ²⁰
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 _{General purpose I/O or UART Ring-Indicator input (active low). This pin has an inter-}
nal pull-up resistor. Internal pull-up resistor is disabled during suspend mode. If
using this GPIO as an input, a pull-up resistor is required to minimize the power con-
sumption in the suspend mode.
I/O _{General purpose I/O or UART Carrier-Detect input (active low). This pin has an inter-}
nal pull-up resistor. Internal pull-up resistor is disabled during suspend mode. If
using this GPIO as an input, a pull-up resistor is required to minimize the power con-
sumption in the suspend mode.
I/O _{General purpose I/O or UART Data-Set-Ready input (active low). This pin has an}
internal pull-up resistor. Internal pull-up resistor is disabled during suspend mode. If
using this GPIO as an input, a pull-up resistor is required to minimize the power con-
sumption in the suspend mode.
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