XR20M1170G16-0B Datasheet, PDF (4/56 Pages) Exar Corporation – I2C/SPI UART WITH 64-BYTE FIFO

XR20M1170
I2C/SPI UART WITH 64-BYTE FIFO
Pin Description
REV. 1.1.0
NAME
RESET#
CTS#
GPIO6
CD#
GPIO7
RI#
VCC
A0
CS#
A1
SI
SO
-
NC
24-QFN
PIN #
18
19
20
16-QFN
PIN #
24-TSSOP 16-TSSOP
PIN#
PIN #
TYPE
DESCRIPTION
12
21
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.
13
22
15
I _{UART Clear-To-Send. This input can be used for}
Auto CTS Hardware Flow Control or as a general
purpose input.
-
23
-
I/O _{General purpose I/O pin or CD# input.}
21
-
24
-
I/O _{General purpose I/O pin or RI# input.}
22
14
1
23
15
2
24
16
3
1
1
4
PAD
PAD
-
-
-
-
16
Pwr _{1.62V 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).
2
I _I2_{C-bus device address select A1 or SPI data input}
pin. If I²C-bus onfiguration is selected, this pin
along with A0 pin allows user to change the
device’s base address. If SPI configuration is
selected, this pin is the SPI data input pin.
3
O _{SPI data output pin. If SPI configuration is}
selected then this pin is a three-stateable output
pin. If I2C-bus configuration is selected, this pin is
undefined and must be left unconnected.
-
Pwr _{The center pad on the backside of the QFN pack-}
ages is metallic and is not electrically connected to
anything inside the device. It must be soldered on
to the PCB and may be optionally connected to
GND on the PCB. The thermal pad size on the
PCB should be the approximate size of this center
pad and should be solder mask defined. The sol-
der mask opening should be at least 0.0025"
inwards from the edge of the PCB thermal pad.
-
- _{No Connection.}
Pin type: I=Input, O=Output, I/O= Input/output, OD=Output Open Drain.
4