XR20M1170G16-0B Datasheet, PDF (3/56 Pages) Exar Corporation – I2C/SPI UART WITH 64-BYTE FIFO

REV. 1.1.0
PIN DESCRIPTIONS
XR20M1170
I2C/SPI UART WITH 64-BYTE FIFO
Pin Description
NAME
24-QFN
PIN #
16-QFN
PIN #
24-TSSOP ^16-TSSOP
PIN#
PIN #
TYPE
DESCRIPTION
I2C (SPI) INTERFACE
GPIO0
2
-
5
GPIO1
3
-
6
I2C/SPI#
4
2
7
RX
5
3
8
TX
6
4
9
GPIO2
7
-
10
XTAL1
8
5
11
XTAL2
9
6
12
GPIO3
10
-
13
GND
11
7
14
SDA
12
8
15
SCL
13
9
16
IRQ#
14
10
17
RTS#
15
11
18
GPIO5
16
-
19
DTR#
GPIO4
17
-
20
DSR#
-
I/O _{General purpose I/O pin.}
-
I/O _{General purpose I/O pin.}
4
I/O _I2_{C-bus or SPI interface select. I}2_{C-bus interface}
is selected if this pin is HIGH. SPI interface is
selected if this pin is LOW
5
I _{UART Receive Data or Infrared Receive Data.}
UART receive data input must idle HIGH. Infrared
receive data input must idle LOW. If this pin is not
used, tie it to VCC or pull it high via a 100k ohm
resistor.
6
O _{UART Transmit Data or Infrared Encoder Data. In}
the standard UART Transmit Data mode, the TX
signal will be HIGH during reset or idle (no data). In
the Infrared mode, the inactive state (no data) for
the Infrared encoder/decoder interface is LOW. If
ithis pin is not used, it should be left unconnected.
-
I/O _{General purpose I/O pin.}
7
I _{Crystal or external clock input.}
8
O _{Crystal or buffered clock output.}
-
I/O _{General purpose I/O pin.}
9
Pwr _{Power supply common, ground.}
10
O _I2_{C-bus data input/output (open-drain). If SPI con-}
figuration is selected, then this pin is undefined and
must be connected to VCC.
11
I _I2_{C-bus or SPI serial input clock.}
When the I²C-bus interface is selected, the serial
clock idles HIGH. When the SPI interface is
selected, the serial clock idles LOW.
12
OD _{Interrupt output (open-drain, active LOW).}
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 pur-
pose output.
-
I/O _{General purpose I/O pin or DTR# output.}
-
I/O _{General purpose I/O pin or DSR# input.}
3