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103007

FEATURES

Temperature Measurements Require No

External Components

Measures Temperatures from -55

°C to

+120

°C. Fahrenheit Equivalent is -67°F to

+248

°F

Thermometer Accuracy is

±2.0°C

Thermometer Resolution is Configurable

from 8 to 12 bits (1.0

°C to 0.0625°C

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), 8-Pin

μMAX, and Flip-Chip Package

PIN ASSIGNMENT

PIN DESCRIPTION

SERMODE

- Serial Interface Mode

CE

- Chip Enable

SCLK

- Serial Clock

GND

- Ground

- Analog Supply Voltage

SDO

- Serial Data Out

SDI

- Serial Data In

- 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), 8-pin μMAX, and flip-chip package.

Applications for the DS1722 include personal computers/servers/workstations, cellular telephones, office

equipment, or any thermally-sensitive system.

DS1722

Digital Thermometer with

SPI/3-Wire Interface

www.maxim-ic.com

CE

SCLK

GND

2

3

4

8

7

6

5

1

DS1722S

8-Pin SO (150mil)

SERMODE

SDI

SDO

1

8

2

7

3

6

4

5

*

DS1722U

8-PIN µMAX

SERMODE

SDI

SDO

CE

SCLK

GND