xr21v1412 Exar Corporation, xr21v1412 Datasheet - Page 4

• Manufacturer Part Number: xr21v1412
• Description: 2-ch Full-speed Usb Uart
• Manufacturer: Exar Corporation

XR21V1412
2-CH FULL-SPEED USB UART
PIN DESCRIPTIONS
Pin Description
UART Channel A Signals
UART Channel B Signals
GPIOA2/DSRA#
GPIOA3/DTRA#
GPIOB2/DSRB#
GPIOA4/CTSA#
GPIOA5/RTSA#
GPIOA1/CDA#
GPIOB1/CDB#
GPIOA0/RIA#
GPIOB0/RIB#
N
RXA
RXB
TXA
TXB
AME
32-QFN
P
12
11
10
16
15
22
21
20
IN
6
5
9
8
7
#
T
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
YPE
O
O
I
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.
UART Channel A Transmit Data or IR Transmit Data.
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.
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.
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.
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.
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.
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 Receive Data or IR Receive Data. This pin has an internal pull-up
resistor. Internal pull-up resistor is not disabled during suspend mode.
UART Channel B Transmit Data or IR Transmit Data.
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.
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.
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.
4
D
ESCRIPTION
REV. 1.0.0