LM92 datasheet(1/17 Pages) NSC

No. de pieza	LM92

Descripción Electrónicos	짹0.33째C Accurate, 12-Bit Sign Temperature Sensor and Thermal Window Comparator with Two-Wire Interface

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Fabricante Electrónico	NSC [National Semiconductor (TI)]

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LM92

±0.33˚C Accurate, 12-Bit + Sign Temperature Sensor and

Thermal Window Comparator with Two-Wire Interface

General Description

The LM92 is a digital temperature sensor and thermal win-

dow comparator with an I

2C™ Serial Bus interface and an

accuracy of ±0.33˚C. The window-comparator architecture

of the LM92 eases the design of temperature control sys-

tems. The open-drain Interrupt (INT) output becomes active

whenever temperature goes outside a programmable win-

dow,

while

a

separate

Critical

Temperature

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 LM92’s 2.7V to 5.5V supply voltage range, Serial Bus

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

128˚C make it ideal for a wide range of applications. These

include thermal management and protection applications in

personal computers, electronic test equipment, office elec-

tronics, automotive, medical and HVAC 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 LM92s can be connected to a single bus

n

12-bit + sign output

n

Operation up to 150˚C

Key Specifications

j Supply Voltage

2.7V to 5.5V

j Supply Current

operating

350 µA (typ)

625 µA (max)

shutdown

5 µA (typ)

j Temperature

30˚C

±0.33˚C (max)

Accuracy

10˚C to 50˚C

±0.50˚C (max)

−10˚C to 85˚C

±1.0˚C (max)

125˚C

±1.25˚C (max)

−25˚C to 150˚C

±1.5˚C (max)

j Linearity

±0.5˚C (max)

j Resolution

0.0625˚C

Applications

n

HVAC

n

Medical Electronics

n

Electronic Test Equipment

n

System Thermal Management

n

Personal Computers

n

Office Electronics

n

Automotive

Simplified Block Diagram

10105101

I2C® is a registered trademark of Philips Corporation.

March 2005

DS101051

www.national.com

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LM92 Datasheet(PDF) 1 Page - National Semiconductor (TI)

LM92 Datasheet(HTML) 1 Page - National Semiconductor (TI)

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