LM76CHMX-5 datasheet(1/15 Pages) NSC

Part #	LM76CHMX-5

Description	짹0.5째C, 짹1째C, 12-Bit Sign Digital Temperature Sensor and Thermal Window Comparator with Two-Wire Interface

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LM76

±0.5˚C, ±1˚C, 12-Bit + Sign Digital Temperature Sensor

and Thermal Window Comparator with Two-Wire

Interface

General Description

The LM76 is a digital temperature sensor and thermal win-

dow comparator with an I

2C™ Serial Bus interface with an

accuracy of ±1˚C. This accuracy for the LM76CHM is speci-

fied for a −10˚C to 45˚C temperature range, while for the

LM76CNM the temperature range is 70˚C to 100˚C. The

LM76CHM is specified with an accuracy ±0.5˚C at 25˚C. The

window-comparator architecture of the LM76 eases the de-

sign of temperature control systems conforming to the ACPI

(Advanced Configuration and Power Interface) specification

for personal computers. The open-drain Interrupt (INT) out-

put becomes active whenever temperature goes outside a

programmable window, while a separate Critical Tempera-

ture Alarm (T_CRIT_A) output becomes active when the

temperature exceeds a programmable critical limit. The INT

output can operate in either a comparator or event mode,

while the T_CRIT_A output operates in comparator mode

only.

The host can program both the upper and lower limits of the

window as well as the critical temperature limit. Program-

mable hysterisis as well as a fault queue are available to

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

address selection. The sensor powers up with default thresh-

olds of 2˚C T

HYST,

10˚C T

LOW,

64˚C T

HIGH,

and 80˚C

T_CRIT.

The LM76’s 3.3V and 5.0V supply voltage, Serial Bus inter-

face, 12-bit + sign output, and full-scale range of over 127˚C

make it ideal for a wide range of applications. These include

thermal management and protection applications in personal

computers, electronic test equipment, office electronics and

bio-medical applications.

Features

n Window comparison simplifies design of ACPI

compatible temperature monitoring and control.

n Serial Bus interface

n Separate open-drain outputs for Interrupt and Critical

Temperature shutdown

n Shutdown mode to minimize power consumption

n Up to 4 LM76s can be connected to a single bus

n 12-bit + sign output; full-scale reading of over 127˚C

Key Specifications

n Supply Voltage

3.3V or 5.0V

n Supply Current

operating

250 µA (typ)

450 µA (max)

shutdown

8 µA (max)

n Temperature

Accuracy

+25˚C

−10˚C to +45˚C

±0.5˚C(max)

±1.0˚C(max)

70˚C to 100˚C

±1.0˚C(max)

n Resolution

0.0625˚C

Applications

n System Thermal Management

n Personal Computers

n Office Electronics

n HVAC

I2C® is a registered trademark of Philips Corporation.

January 2000

DS101015

www.national.com

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LM76CHMX-5 Datasheet(PDF) 1 Page - National Semiconductor (TI)

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