XR20M1170 Datasheet, PDF (4/60 Pages) Exar Corporation – I2C/SPI UART WITH 64-BYTE FIFO

XR20M1170
I2C/SPI UART WITH 64-BYTE FIFO
Pin Description
REV. 1.0.0
NAME
ENIR#
EN485#
IRQ#
RTS#
GPIO5
DTR#
GPIO4
DSR#
RESET#
CTS#
GPIO6
CD#
GPIO7
RI#
VCC
A0
CS#
28-QFN
PIN #
24-QFN
PIN #
16-QFN
PIN #
24-TSSOP 16-TSSOP
PIN#
PIN #
TYPE
DESCRIPTION
15
-
-
-
-
I _{Enable IR Mode (internal pull-up resistor). This}
pin is sampled upon power-up. If this pin is
HIGH, then the TX output and RX input will
behave as the UART transmit data output and
UART receive data input. If this pin is LOW,
then the TX output and RX input will behave as
the infrared encoder data output and the infra-
red receive data input.
16
-
-
-
-
I _{Enable Auto RS-485 Half-Duplex Mode (inter-}
nal pull-up resistor). This pin is sampled upon
power-up. If this pin is HIGH, then the RTS#
output can be used for Auto RTS Hardware
Flow Control or as a general purpose output. If
this pin is LOW, then the RTS# output is the
Auto RS-485 Half-Duplex direction control pin.
17
14
10
17
12
OD _{Interrupt output (open-drain, active LOW).}
18
15
11
18
13
O _{UART Request-To-Send. This output can be}
used for Auto RTS Hardware Flow Control,
Auto RS-485 Half-Duplex direction control or
as a general purpose output.
19
16
-
19
-
I/O _{General purpose I/O pin or DTR# output.}
20
17
-
20
-
I/O _{General purpose I/O pin or DSR# input.}
21
18
12
21
22
19
13
22
23
20
-
23
14
I _{Reset (active LOW) - A longer than 40 ns LOW}
pulse on this pin will reset the internal registers
and all outputs. The UART transmitter output
will be idle and the receiver input will be
ignored.
15
I _{UART Clear-To-Send. This input can be used}
for Auto CTS Hardware Flow Control or as a
general purpose input.
-
I/O _{General purpose I/O pin or CD# input.}
24
21
-
24
-
I/O _{General purpose I/O pin or RI# input.}
25
22
14
1
26
23
15
2
16
Pwr _{2.25V to 3.6V power supply.}
1
I _I2_{C-bus device address select A0 or SPI chip}
select. If I²C-bus configuration is selected, this
pin along with the A1 pin allows user to change
the device’s base address. If SPI configuration
is selected, this pin is the SPI chip select pin
(Schmitt-trigger, active LOW).
4