DS1722 Datasheet, PDF (2/14 Pages) Dallas Semiconductor – Digital Thermometer with SPI/3-Wire Interface

ORDERING INFORMATION Table 1
PART
MARKING
DESCRIPTION
DS1722S
DS1722
DS1722 in 150mil 8-Pin SO
DS1722S/T&R DS1722
DS1722 in 150mil 8-Pin SO, 2500 Piece Tape-and-
Reel
DS1722S+
DS1722 (See DS1722 in Lead-Free 150mil 8-Pin SO
note)
DS1722S+T&R DS1722 (See DS1722 in Lead-Free 150mil 8-Pin SO, 2500 Piece
note)
Tape-and-Reel
DS1722U
1722
DS1722 in 8-Pin µMAX
DS1722U/T&R 1722
DS1722 in 8-Pin µMAX, 3000 Piece Tape-and-
Reel
DS1722U+
1722 (See note) DS1722 in Lead-Free 8-Pin µMAX
DS1722U+T&R 1722 (See note) DS1722 in Lead-Free 8-Pin µMAX, 3000 Piece
Tape-and-Reel
Note: A “+” will also be marked on the package next to the pin 1 indicator.
DS1722
DETAILED PIN DESCRIPTION Table 2
SOIC SYMBOL DESCRIPTION
PIN 1
PIN 2
PIN 3
PIN 4
PIN 5
PIN 6
PIN 7
PIN 8
V_DDD
CE
SCLK
GND
SDO
SDI
SERMODE
V_DDA
Digital Supply Voltage 1.8V-5.5V. Defines the top rails for the digital
inputs and outputs.
Chip Enable Must be asserted high for communication to take place for
either the SPI or 3-wire interface.
Serial Clock Input Used to synchronize data movement on the serial
interface for either the SPI or 3-wire interface.
Ground pin.
Serial Data Output When SPI communication is selected, the SDO pin is
the serial data output for the SPI bus. When 3-wire communication is
selected, this pin must be tied to the SDI pin (the SDI and SDO pins function
as a single I/O pin when tied together.)
Serial Data Input When SPI communication is selected, the SDI pin is the
serial data input for the SPI bus. When 3-wire communication is selected,
this pin must be tied to the SDO pin (the SDI and SDO pins function as a
single I/O pin when tied together.)
Serial Interface Mode Input This pin selects which interface standard will
be used: SPI when connected to V_CC ; standard 3-wire when connected to
GND.
Analog Supply Voltage 2.65V – 5.5V input power pin.
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