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PRODUCT PREVIEW

PRELIMINARY

DS1775

SOT23-5 Digital Thermometer

and Thermostat

www.dalsemi.com

FEATURES

摟

Temperature measurements require no

external components

摟

Measures temperatures from 鈥?5擄 to

C

+125擄 Fahrenheit equivalent is 鈥?7擄 to

C.

F

257擄

F

摟

Thermometer accuracy is

鹵2.0擄

C

摟

Thermometer resolution is configurable from

9 to 12 bits (0.5擄 to 0.0625擄 resolution)

C

C

摟

Thermostat settings are user definable

摟

Data is read from/written to via a 2鈥搘ire

serial interface

摟

Wide power supply range (2.7V 鈥?5.5V)

摟

Software compatible with DS75 2鈥揥ire

Thermal Watchdog in thermometer mode

摟

Space鈥揷onscious SOT23鈥? package with

low thermal time constant

PIN ASSIGNMENT

SCL

GND

O.S.

1

2

3

4

V

DD

5

SDA

DS1775R

SOT23-5

PIN DESCRIPTION

GND

SCL

SDA

V

DD

O.S.

Ground

2鈥揥ire Serial Clock

2鈥揥ire Serial Data Input/Output

Power Supply Voltage

Thermostat Output Signal

Address

100

101

110

111

ORDERING INFORMATION

Part Number

Address

DS1775R/TRL

000

DS1775R/TR1

001

DS1775R/TR2

010

DS1775R/TR3

011

* "R" denotes SOT 23-5 Package

Part Number

DS1775R/TR4

DS1775R/TR5

DS1775R/TR6

DS1775R/TR7

DESCRIPTION

The DS1775 SOT23-5 Digital Thermometer and Thermostat provides temperature readings which

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

communicated to/from the DS1775 over a simple 2鈥搘ire serial interface. No additional components are

required; the device is truly a 鈥渢emperature鈥搕o鈥揹igital鈥?converter.

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.

The open鈥揹rain thermal alarm output, O.S., becomes active when the temperature of the device exceeds a

user鈥揹efined temperature T

OS

. The number of consecutive faults required to set O.S. active is

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.

1 of 13

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