XR21V1414 Datasheet, PDF (6/26 Pages) Exar Corporation – 4-CH FULL-SPEED USB UART

XR21V1414
4-CH FULL-SPEED USB UART
Pin Description
REV. 1.0.0
NAME
48-QFN
PIN #
TYPE
DESCRIPTION
UART Channel D Signals
RXD
39
TXD
38
GPIOD0/RID#
37
GPIOD1/CDD#
34
GPIOD2/DSRD#
3
GPIOD3/DTRD#
48
GPIOD4/CTSD#
47
GPIOD5/RTSD#
46
I
UART Channel D 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 D Transmit Data or IR Transmit Data.}
I/O _{General purpose I/O or UART Ring-Indicator 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 consumption in the suspend mode.
I/O _{General purpose I/O or UART Carrier-Detect 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 consumption 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 consumption 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 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 Request-to-Send output (active low). This}
pin has an internal pull-up resistor. Internal pull-up resistor is disabled dur-
ing suspend mode. If using this GPIO as an input, a pull-up resistor is
required to minimize the power consumption in the suspend mode.
USB Interface Signals
USBD+
43
USBD-
42
I/O _{USB port differential data plus. This pin has a 1.5 K Ohm internal pull-up}
resistor.
I/O _{USB port differential data minus.}
I2C Interface Signals
SDA
35
OD _I2_{C-controller data input/output (open-drain). 1K pull-up resistor is}
required if an EEPROM is connected. An optional external I²C EEPROM
can be used to store default configurations upon power-up including the
USB Vendor ID and Device ID.
If an EEPROM is not used, this pin can be used with the SCL pin to select
the Remote Wake-up and Power modes. An external pull-up or pull-down
resistor is required. See Table 1.
6