Datasheet > LM40

LM40

更新时间： 2024-11-26 22:31:11

品牌	Logo	应用领域
美国国家半导体 - NSC		二极管监控
页数	文件大小	规格书
27页	364K
描述
Hardware Monitor with Dual Thermal Diodes and SensorPath Bus

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LM40 数据手册

May 2004

LM40

Hardware Monitor with Dual Thermal Diodes and

™

SensorPath Bus

General Description

— Internal scaling resistors for all inputs

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

The LM40 is a hardware monitor that measures 3 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

LM40 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 LM40 can realize a hardware monitor

function that includes limit checking for measured values,

autonomous fan speed control and many other functions.

n Temperature Sensing

— 2 remote diode temperature sensor zones

— Internal local temperature zone

— 0.5 ˚C resolution

— Measures temperatures up to 140 ˚C

n 14-lead TSSOP package

Key Specifications

n Voltage Measurement Accuracy

n Temperature Sensor Accuracy

n Temperature Range:

2 % (max)

3 ˚C (max)

The LM40 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 LM40 can resolve tem-

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

temperature range of the LM40 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 LM40s to be placed on one

SensorPath bus.

— LM40 junction

— Remote Temp Accuracy

n Power Supply Voltage

n Average Power Supply Current

n Conversion Time (all Channels)

0 ˚C to +85 ˚C

0 ˚C to +100 ˚C

+3.0 V to +3.6 V

0.5 mA (typ)

29.6ms to 1456ms

Applications

n Microprocessor based equipment

Features

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

ATMs, Point of Sale, …)

n Power Supplies

SensorPath Interface

— 2 hardware programmable addresses

n Voltage Monitoring

— 9-bit Σ∆ ADC

Typical Application

20068401

™

SensorPath is a trademark of National Semiconductor Corporation

DS200684

www.national.com

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