XR20M1170 Datasheet, PDF (5/60 Pages) Exar Corporation – I2C/SPI UART WITH 64-BYTE FIFO

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Pin Description
XR20M1170
I2C/SPI UART WITH 64-BYTE FIFO
NAME
A1
SI
SO
-
NC
28-QFN
PIN #
24-QFN
PIN #
16-QFN
PIN #
24-TSSOP 16-TSSOP
PIN#
PIN #
TYPE
DESCRIPTION
27
24
16
3
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.
28
1
1
4
3
O _{SPI data output pin. If SPI configuration is}
selected then this pin is a three-stateable out-
put pin. If I2C-bus configuration is selected,
this pin is undefined and must be left uncon-
nected.
PAD
PAD
PAD
-
-
Pwr _{The center pad on the backside of the QFN}
packages is metallic and is not electrically con-
nected 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 approxi-
mate size of this center pad and should be sol-
der mask defined. The solder mask opening
should be at least 0.0025" inwards from the
edge of the PCB thermal pad.
4, 8
-
-
-
-
- _{No Connection.}
Pin type: I=Input, O=Output, I/O= Input/output, OD=Output Open Drain.
5