XR21V1414_10 Datasheet, PDF (7/32 Pages) Exar Corporation – 4-CH FULL-SPEED USB UART

REV. 1.1.0
Pin Description
NAME
GPIOD2/DSRD#
48-QFN
PIN #
3
GPIOD3/DTRD#
48
GPIOD4/CTSD#
47
GPIOD5/RTSD#
46
USB Interface Signals
USBD+
43
USBD-
42
I2C Interface Signals
SDA
35
SCL
36
XR21V1414
4-CH FULL-SPEED USB UART
TYPE
DESCRIPTION
I/O _{UART Channel D 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 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 D general purpose I/O or UART Data-Terminal-Ready out-}
put (active low). See ”Section 1.5.5, 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 D 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 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.
I/O _{UART Channel D 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 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.
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.}
OD _I2_{C-controller data input/output (open-drain). An optional external I}2_C
EEPROM can be used to store default configurations upon power-up
including the USB Vendor ID and Device ID. See Table 3. A pull-up
resisitor (typically 4.7 to 10 KOhms) is required.
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 2.
I
I²C-controller serial input clock. An optional external I²C EEPROM can be
used to store default configurations upon power-up including the USB
Vendor ID and Device ID. See Table 3. A pull-up resisitor (typically 4.7
to 10 KOhms) is required.
If an EEPROM is not used, this pin can be used with the SDA pin to select
the Remote Wake-up and Power modes. An external pull-up or pull-down
resistor is required. See Table 2.
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