DS1721U+T&R【PDF 1/17 页】IC THERMOMETER/STAT DIG HP 8USOP

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110405

FEATURES

?Temperature measurements require no

external components with ?癈 accuracy

?Measures temperatures from -55癈 to

+125癈; Fahrenheit equivalent is -67癋 to

+257癋

?Temperature resolution is configurable from 9

to 12 (default) bits (0.5癈 to 0.0625癈

resolution)

?Maximum conversion time (9-bit resolution)

of 93.75 ms

?Thermostatic settings are user-definable

?Data is read/written via a 2-wire serial

interface (open drain I/O lines); 3-bit

addressability

?Wide power supply range (2.7V - 5.5V)

?Applications include personal computers,

cellular telephones, office equipment, or any

thermally sensitive system

?8-pin, 150-mil SOIC package and 8-pin 礢OP

package

PIN ASSIGNMENT

PIN DESCRIPTION

SDA

- 2-Wire Serial Data Input/Output

SCL

- 2-Wire Serial Clock

GND

- Ground

OUT

- Thermostat Output Signal

- Chip Address Input

- Power Supply Voltage (+5V)

DESCRIPTION

The DS1721 2-Wire Digital Thermometer and Thermostat provides 12-bit temperature readings, which

indicate the temperature of the device. Thermostatic settings and temperature readings are all

communicated to/from the DS1721 over a simple 2-wire serial interface. No additional components are

required; the device is truly a temperature-to-digital converter.

The DS1721 has three address bits that allow a user to multidrop up to eight sensors along the 2-wire bus,

greatly simplifying the bussing of distributed temperature sensing networks.

The thermal alarm output, T

OUT

, is active when the temperature of the device exceeds a user-defined

temperature TH. The output remains active until the temperature is equal to or below the user-defined

temperature TL, allowing for any hysteresis necessary. The active state of T

OUT

is configurable by the

user.

For applications that require faster conversion times, the user can adjust the readout resolution from 12 to

9 bits, effectively reducing the conversion time from 750ms (MAX) to 93.75 ms (MAX). This is

particularly useful in applications where temperature changes large magnitudes very rapidly.

Applications for DS1721 include personal computers/services, cellular telephones, office equipment, or

any microprocessor-based, thermally sensitive system.

DS1721

2-Wire Digital Thermometer

and Thermostat

www.maxim-ic.com

DS1721U

8-Pin ?SOP

SDA

SCL

OUT

GND

2 7

DS1721S

8-Pin SOIC (150-mil)

SDA

SCL

OUT

GND

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