DS1722 查看數據表（PDF） - Maxim Integrated

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DS1722

Digital Thermometer with SPI/3-Wire Interface

Maxim Integrated 

DS1722

Digital Thermometer with

SPI/3-Wire Interface

www.maxim-ic.com

FEATURES

PIN ASSIGNMENT

ƒ Temperature Measurements Require No

External Components

ƒ Measures Temperatures from -55°C to

VDDD

1

8

VDDA

VDDD

1*

8

VDDA

CE

2

7

SERMODE CE

2

7 SERMODE

+120°C. Fahrenheit Equivalent is -67°F to SCLK

3

6

SDI

+248°F

GND

4

5

SDO

SCLK 3

GND 4

6 SDI

5

SDO

ƒ Thermometer Accuracy is ±2.0°C

ƒ Thermometer Resolution is Configurable

DS1722S

8-Pin SO (150mil)

DS1722U

8-PIN µMAX

from 8 to 12 bits (1.0°C to 0.0625°C

Resolution)

ƒ Data is Read From/Written to Via a Motorola

PIN DESCRIPTION

SERMODE

- Serial Interface Mode

Serial Peripheral Interface (SPI) or Standard

CE

- Chip Enable

3-Wire Serial Interface

ƒ Wide Analog Power Supply Range (2.65V -

SCLK

GND

- Serial Clock

- Ground

5.5V)

ƒ Separate Digital Supply Allows for 1.8V

VDDA

SDO

- Analog Supply Voltage

- Serial Data Out

Logic

ƒ Available in an 8-Pin SO (150mil) and 8-Pin

SDI

VDDD

- Serial Data In

- Digital Supply Voltage

μMAX package

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 μMAX package.

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

equipment, or any thermally-sensitive system.

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022008

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