XR21V1414IM-0B-EB Datasheet, PDF (5/34 Pages) Exar Corporation – 4-CH FULL-SPEED USB UART

REV. 1.3.0
Pin Description
NAME
TXB
GPIOB0/RIB#/
RWKB#
48-QFN
PIN #
8
15
GPIOB1/CDB#
14
GPIOB2/DSRB#
13
GPIOB3/DTRB#
12
GPIOB4/CTSB#
11
GPIOB5/RTSB#/
10
RS485B
UART Channel C Signals
RXC
23
TXC
22
GPIOC0/RIC#/
29
RWKC#
XR21V1414
4-CH FULL-SPEED USB UART
TYPE
DESCRIPTION
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) or Remote Wakeup Input (See ”Section 1.5.12, USB Sus-
pend” 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 external
pull-up resistor is required to minimize the power consumption in the sus-
pend mode.
I/O _{UART Channel B 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 B 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 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 B general purpose I/O or UART Data-Terminal-Ready out-}
put (active low). See ”Section 1.5.6, 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 B 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 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 B 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 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
UART Channel C 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 C Transmit Data or IR Transmit Data.}
I/O _{UART Channel C general purpose I/O or UART Ring-Indicator input}
(active low) or Remote Wakeup Input (See ”Section 1.5.12, USB Sus-
pend” 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 external
pull-up resistor is required to minimize the power consumption in the sus-
pend mode.
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