xr21v1412 Exar Corporation, xr21v1412 Datasheet - Page 5

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

REV. 1.0.0
N
Pin Description
USB Interface Signals
I2C Interface Signals
Ancillary Signals
GPIOB3/DTRB#
GPIOB4/CTSB#
GPIOB5/RTSB#
OTE
LOWPOWER
: Pin type: I=Input, O=Output, I/O= Input/output, OD=Output Open Drain.
USBD+
USBD-
N
GND
SDA
VCC
SCL
AME
4, 13, 24,
32-QFN
1, 3, 14,
23, 27,
31, 32
P
19
18
17
30
29
25
26
28
IN
2
#
T
Pwr
Pwr
OD
I/O
I/O
I/O
I/O
I/O
YPE
O
I
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.
USB port differential data plus. This pin has a 1.5 K Ohm internal pull-up resistor.
USB port differential data minus.
I
optional external I
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
I
I
the USB Vendor ID and Device ID.
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
Low power status output. This pin is HIGH when the XR21V1412 is in the suspend
mode. This pin is LOW when the XR21V1412 is not in the suspend mode. An exter-
nal pull-up or pull-down resistor is required on this pin. This pin is sampled upon
power-on to configure the polarity of the LOWPOWER output during suspend mode.
An external pull-up resistor will cause the LOWPOWER pin to be HIGH during sus-
pend mode. An external pull-down resistor will cause the LOWPOWER pin to be
LOW during suspend mode
+3.3V power supply. All inputs are 5V tolerant.
Power supply common, ground.
2
2
2
C-controller data input/output (open-drain). 1K pull-up resistor is required. An
C-controller serial input clock. 1K pull-up resistor is required. An optional external
C EEPROM can be used to store default configurations upon power-up including
Table 1
Table 1
2
C EEPROM can be used to store default configurations upon
.
.
5
D
ESCRIPTION
2-CH FULL-SPEED USB UART
XR21V1412