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DS1722
 
 
Digital Thermometer with
 
 
SPI/3-Wire Interface
 
 
www.maxim-ic.com
FEATURES
   Temperature Measurements Require No
External Components
 
1 of 14
 
022008
   Measures Temperatures from -55癈 to
+120癈. Fahrenheit Equivalent is -67癋 to
+248癋
   Thermometer Accuracy is ?.0癈
   Thermometer Resolution is Configurable
from 8 to 12 bits (1.0癈 to 0.0625癈
Resolution)
   Data is Read From/Written to Via a Motorola
Serial Peripheral Interface (SPI) or Standard
3-Wire Serial Interface
   Wide Analog Power Supply Range (2.65V -
5.5V)
   Separate Digital Supply Allows for 1.8V
Logic
   Available in an 8-Pin SO (150mil) and 8-Pin
糓AX package
PIN ASSIGNMENT 
 
 
 
 
 
 
V
DDD
 
 
PIN DESCRIPTION
SERMODE   
- Serial Interface Mode
CE     
 
- Chip Enable
SCLK
 
- Serial Clock
GND
 
- Ground
V
DDA
   
 
- Analog Supply Voltage
SDO   
 
- Serial Data Out
SDI    
 
- Serial Data In
V
DDD
 
 
- Digital Supply Voltage
 
DESCRIPTION
The DS1722 Digital Thermometer and Thermostat with SPI/3-Wire Interface provides temperature
readings which indicate the temperature of the device. No additional components are required; the device
is truly a temperature-to-digital converter. Temperature readings are communicated from the DS1722
over a Motorola SPI interface or a standard 3-wire serial interface. The choice of interface standard is
selectable by the user.
 
For applications that require greater temperature resolution, the user can adjust the readout resolution
from 8 to 12 bits. This is particularly useful in applications where thermal runaway conditions must be
detected quickly.
 
For application flexibility, the DS1722 features a wide analog supply rail of 2.65V - 5.5V. A separate
digital supply allows a range of 1.8V to 5.5V.
 
The DS1722 is available in an 8-pin SO (150mil) and 8-pin 糓AX package.
 
Applications for the DS1722 include personal computers/servers/workstations, cellular telephones, office
equipment, or any thermally-sensitive system.
 
 
 
CE
SCLK
GND
V
2
3
4
8
7
6
5
1
DS1722S
n SO (150mil)
1 8
2 7
3 6
4 5
8-Pi
SDI
SDO
DS1722U
8-PIN MAX
V
DDA
SERMODE
SDI
SDO
V
DDD
CE 
SCLK
GND 
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