XR21V1414IM-0B-EB Datasheet, PDF (7/34 Pages) Exar Corporation – 4-CH FULL-SPEED USB UART

REV. 1.3.0
Pin Description
NAME
GPIOD2/DSRD#
GPIOD3/DTRD#
GPIOD4/CTSD#
GPIOD5/RTSD#/
RS485D
XR21V1414
4-CH FULL-SPEED USB UART
48-QFN
PIN #
3
48
47
46
TYPE
DESCRIPTION
I/O _{UART Channel D 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 D 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 D 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 D 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.
USB Interface Signals
USBD+
43
USBD-
42
I2C Interface Signals
SDA
35
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.}
I/O OD
I²C-controller data input/output (open-drain). 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 10k Ohms) 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.
SCL
36
I/O OD _I2_{C-controller serial input clock. 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 10k Ohms) 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.
7