LM76

www.ti.com

SNIS109E – JANUARY 2000 – REVISED MARCH 2013

LM76 ±0.5°C, ±1°C, 12-Bit + Sign Digital Temperature Sensor and Thermal Window

Comparator with Two-Wire Interface

Check for Samples: LM76

1

FEATURES

DESCRIPTION

The LM76 is a digital temperature sensor and thermal

2

•

Window Comparison Simplifies Design of

ACPI Compatible Temperature Monitoring and

with an accuracy of ±1°C. This accuracy for the

Control.

LM76CHM

is

specified

for

a

−10°C

to

45°C

•

Serial Bus Interface

temperature range. The LM76CHM is specified with

an accuracy ±0.5°C at 25°C. The window-comparator

•

Separate Open-Drain Outputs for Interrupt and

architecture of the LM76 eases the design of

Critical Temperature Shutdown

temperature control systems conforming to the ACPI

•

Shutdown Mode to Minimize Power

(Advanced

Configuration

and

Power

Interface)

Consumption

specification for personal computers. The open-drain

•

Up to 4 LM76s can be Connected to a Single

Interrupt (INT) output becomes active whenever

Bus

temperature goes outside a programmable window,

while

a

separate

Critical

Temperature

Alarm

•

12-bit + Sign Output; Full-scale Reading of

(T_CRIT_A)

output

becomes

active

when

the

Over 127°C

temperature exceeds a programmable critical limit.

The INT output can operate in either a comparator or

KEY SPECIFICATIONS

event mode, while the T_CRIT_A output operates in

•

Supply Voltage 5.0V

comparator mode only.

•

Supply Current

The host can program both the upper and lower limits

of the window as well as the critical temperature limit.

–

Operating

Programmable hysterisis as well as a fault queue are

–

250 µA (typ)

available to minimize false tripping. Two pins (A0, A1)

–

450 µA (max)

are available for address selection. The sensor

–

Shutdown

–

8 µA (max)

The LM76's 5.0V supply voltage, Serial Bus interface,

•

Temperature +25ºC ±0.5ºC (max)

12-bit + sign output, and full-scale range of over

–

Accuracy

127°C make it ideal for a wide range of applications.

–

–10ºC to +45ºC ±10°C (max)

These include thermal management and protection

–

70°C to 100°C ±1.0°C (max)

applications in personal computers, electronic test

equipment,

office

electronics

and

bio-medical

•

Resolution 0.0625°C

applications.

APPLICATIONS

•

System Thermal Management

•

Personal Computers

•

Office Electronics

•

HVAC

1

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2

All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Copyright © 2000–2013, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.