LM32 National Semiconductor Corporation, LM32 Datasheet

LM32

Manufacturer Part Number

LM32

Description

Dual Thermal Diode Temperature Sensor With SensorPath™ Bus

Manufacturer

National Semiconductor Corporation

Datasheet

1.LM32.pdf (24 pages)

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Download datasheet (341Kb)

LM32

Dual Thermal Diode Temperature Sensor with

SensorPath

General Description

The LM32 is a digital temperature sensor that measures 3

temperature zones and has a single-wire interface compat-

ible with National Semiconductor’s SensorPath bus. Sensor-

Path data is pulse width encoded, thereby allowing the LM32

to be easily connected to many general purpose micro-

controllers. Several National Semiconductor Super I/O prod-

ucts include a fully integrated SensorPath master, that when

connected to an LM32 can realize a hardware monitor func-

tion that includes limit checking for measured values, au-

tonomous fan speed control and many other functions.

The LM32 measures the temperature of its own die as well

as two external devices such as a processor thermal diode

or a diode connected transistor. The LM32 can resolve tem-

peratures up to 255˚C and down to -256˚C. The operating

temperature range of the LM32 is 0˚C to +125˚C. The ad-

dress programming pin allows two LM32s to be placed on

one SensorPath bus.

Features

n SensorPath Interface

Typical Application

SensorPath

— 2 hardware programmable addresses

™

is a trademark of National Semiconductor Corporation

™

Bus

DS200711

n 2 remote diode temperature sensor zones

n Internal local temperature zone

n 0.5 ˚C resolution

n Measures temperatures up to 140 ˚C

n 14-lead TSSOP package

Key Specifications

n Temperature Sensor Accuracy

n Temperature Range:

n Power Supply Voltage

n Average Power Supply Current

n Conversion Time (all Channels)

Applications

n Microprocessor based equipment

n Power Supplies

— LM32 junction

— Remote Temp Accuracy

ATMs, Point of Sale, …)

(Motherboards, Video Cards, Base-stations, Routers,

22.5ms to 1456ms

+3.0 V to +3.6 V

0 ˚C to +100 ˚C

0 ˚C to +85 ˚C

www.national.com

0.5 mA (typ)

20071101

3 ˚C (max)

May 2004

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