LM41CIMTX datasheet(1/27 Pages) NSC

Part #	LM41CIMTX

Description	Hardware Monitor with Thermal Diode Inputs and SensorPath??Bus

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Manufacturer	NSC [National Semiconductor (TI)]

Direct Link	http://www.national.com

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LM41

Hardware Monitor with Thermal Diode Inputs and

SensorPath™ Bus

General Description

The LM41 is a hardware monitor that measures 2 tempera-

ture zones, 5 voltages and has a single-wire interface com-

patible with National Semiconductor’s SensorPath bus. Sen-

sorPath data is pulse width encoded, thereby allowing the

LM41 to be easily connected to many general purpose

micro-controllers. Several National Semiconductor Super I/O

products include a fully integrated SensorPath master, that

when connected to the LM41 can realize a hardware monitor

function that includes limit checking for measured values,

autonomous fan speed control and many other functions.

The LM41 measures the temperature of its own die as well

as one external device such as a processor thermal diode or

a diode connected transistor. The LM41 can resolve tem-

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

temperature range of the LM41 is 0˚C to +125˚C. Using

Σ∆

ADC it measures +1.2V, +2.5V, +3.3V, +5V and +12V analog

input voltages with internal scaling resistors. The address

programming pin allows two LM41’s to be placed on one

SensorPath bus.

Features

n

SensorPath Interface

— 2 hardware programmable addresses

n

Voltage Monitoring

— 9-bit

Σ∆ ADC

— Internal scaling resistors for all inputs

— Monitors +1.2V, +2.5 V, +3.3 V, +5 V and +12 V

n

Temperature Sensing

— Remote diode temperature sensor zone

— Internal local temperature zone

— 0.5 ˚C resolution

— Measures temperatures up to 140 ˚C

n

14-lead TSSOP package

Key Specifications

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Voltage Measurement Accuracy

±2 % (max)

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Temperature Sensor Accuracy

±3 ˚C (max)

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Temperature Range:

— LM41 junction

0 ˚C to +85 ˚C

— Remote Temp Accuracy

0 ˚C to +100 ˚C

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Power Supply Voltage

+3.0 V to +3.6 V

n

Average Power Supply Current

0.5 mA (typ)

n

Conversion Time (all Channels)

22.1ms to 1456ms

Applications

n

Microprocessor based equipment

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

ATMs, Point of Sale, …)

n

Power Supplies

Typical Application

20070301

SensorPath™ is a trademark of National Semiconductor Corporation

May 2004

DS200703

www.national.com

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