XR28V384IM48-0A-EB Datasheet, PDF (5/42 Pages) Exar Corporation – XR28V384 3.3V QUAD LPC UART WITH 128-BYTE FIFO

XR28V384
REV. 1.0.0
Pin Description
3.3V QUAD LPC UART WITH 128-BYTE FIFO
NAME
48-TQFP
PIN#
TYPE
DESCRIPTION
RIB#
38
I
UART Channel B Ring-Indicator (active low) or general purpose input. This input
should be connected to VCC or GND when not used.
CTSA#
39
I
UART Channel A Clear-to-Send (active low) or general purpose input. This input
should be connected to VCC or GND when not used.
DSRA#
40
I
UART Channel A Data-Set-Ready (active low) or general purpose input. This
input should be connected to VCC or GND when not used.
RTSA# /
PS_CONF_2E/
41
RS485
UART Channel A Request-to-Send (active low) or general purpose output.
O ^{This pin has an internal pull-up resistor and is sampled upon power-up or reset.}
The registers can later be modified by the software. See Table 1 ’UART Power
On Configuration’.
DTRA# /
42
PS_3E0_IRQA
UART Channel A Data-Terminal-Ready (active low) or general purpose output.
This pin has an internal pull-up resistor and is sampled upon power-up or reset.
O _{This will determine the default register settings for UART Channel A. The regis-}
ters can later be modified by the software. See Table 1 ’UART Power On Con-
figuration’.
RXA
43
I
UART Channel A Receive data.The receive data input must idle at logic 1 condi-
tion. This input should be connected to VCC or GND when not used.
TXA /
44
PS_3F8_IRQA
UART Channel A Transmit Data. The TXA signal will be a logic 1 during reset or
idle (no data). If it is not used, leave it unconnected.
O ^{This pin has an internal pull-up resistor and is sampled upon power-up or reset.}
This will determine the default register settings for UART Channel A. The regis-
ters can later be modified by the software. See Table 1 ’UART Power On Con-
figuration’.
CDA#
45
I
UART Channel A Carrier-Detect (active low) or general purpose input. This input
should be connected to VCC or GND when not used.
RIA#
46
I
UART Channel A Ring-Indicator (active low) or general purpose input. This input
should be connected to VCC or GND when not used.
IRRXA#
47
I
Infrared Receiver input. The infrared receive data input idles at logic 0. This input
should be connected to GND when not used.
IRTXA#
48
O
Infrared Transmitter output. The IRTXA# signal will be a logic 0 during reset or
idle (no data).
ANCILLARY SIGNALS
CLKIN
12
I Clock input 24 MHz or 48 MHz.
WDTOUT#
Active low watchdog timer output. This pin is open drain and needs a pull-up
2
O resistor if it is used. The registers can later be modified by the software. See
Table 1 ’UART Power On Configuration’.
POWER SIGNALS
VCC
11, 30 Pwr 3.3V ± 10% power supply.
GND
3, 29 Pwr Power supply common, ground.
Pin type: I=Input, O=Output, I/O= Input/output, Pwr=Power supply.
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