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112299

FEATURES

=Temperature measurements require no

external components

Measures

temperatures

from

–55

°C to

+125

°C. Fahrenheit equivalent is –67°F to

+257

°F.

Thermometer accuracy is

±2.0°C.

Thermometer resolution is configurable from

nine (default) to 12 bits (0.5

°C to 0.0625°C

resolution)

9–bit

readout

mode

features

a

max

conversion time of 150 ms.

Thermostatic settings are user definable.

Data is read from/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.

Pin/software compatible to LM75CIM–x

Thermal Watchdog in 9–bit (default) mode.

8–pin 150 mil SOIC package.

PIN ASSIGNMENT

PIN DESCRIPTION

SDA

–

2–Wire Serial Data Input/Output

SCL

–

2–Wire Serial Clock

GND

–

Ground

O.S.

–

Thermostat Output Signal

A0

–

Chip Address Input

A1

–

Chip Address Input

A2

–

Chip Address Input

–

Power Supply Voltage

DESCRIPTION

The DS75 2–wire thermal watchdog provides 9–bit temperature readings which indicate the temperature

of the device. Thermostat settings and temperature readings are all communicated to/from the DS75 over

a simple 2–wire serial interface. No additional components are required; the device is truly a

“temperature–to–digital” converter.

The DS75 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 open–drain thermal alarm output, O.S., becomes active when the temperature of the device exceeds a

configurable by the user. The device can also be configured in the interrupt or comparator mode, to

customize the method which clears the fault condition.

For applications that require greater temperature resolution, the user can adjust the readout resolution

from 9 to 12 bits. This is particularly useful in applications where thermal runaway conditions must be

detected quickly.

DS75

2–Wire Thermal Watchdog

www.dalsemi.com

6

3

1

2

4

8

7

5

SDA

O.S.

GND

SCL

DS75S

8-PIN SOIC (150 MIL)