LM40 datasheet(1/27 Pages) NSC

部件名	LM40

功能描述	Hardware Monitor with Dual Thermal Diodes and SensorPath Bus

PDF	27 Pages

Scroll/Zoom	100%

制造商	NSC [National Semiconductor (TI)]

网页	http://www.national.com

标志

1 / 27 page

LM40

Hardware Monitor with Dual Thermal Diodes and

SensorPath™ Bus

General Description

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.

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.

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

— 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

±2 % (max)

n

Temperature Sensor Accuracy

±3 ˚C (max)

n

Temperature Range:

— LM40 junction

0 ˚C to +85 ˚C

— Remote Temp Accuracy

0 ˚C to +100 ˚C

n

Power Supply Voltage

+3.0 V to +3.6 V

n

Average Power Supply Current

0.5 mA (typ)

n

Conversion Time (all Channels)

29.6ms to 1456ms

Applications

n

Microprocessor based equipment

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

ATMs, Point of Sale, …)

n

Power Supplies

Typical Application

20068401

SensorPath™ is a trademark of National Semiconductor Corporation

May 2004

DS200684

www.national.com

类似零件编号 - LM40

制造商	部件名	数据表	功能描述
LM Technologies Ltd	LM400	4Mb / 7P	LM400 Bluetooth® v2.0, v2.1 Module with IC Antenna
SEMTECH ELECTRONICS LTD...	LM4001	280Kb / 2P	SURFACE MOUNT SILICON RECTIFIERS
Microdiode Semiconducto...	LM4001	908Kb / 2P	SURFACE MOUNT RECTIFIERS
Microdiode Semiconducto...	LM4001	505Kb / 2P	SURFACE MOUNT RECTIFIER
SEMTECH ELECTRONICS LTD...	LM4001G	281Kb / 2P	SURFACE MOUNT GLASS PASSIVATED SILICON RECTIFIERS

More results

类似说明 - LM40

制造商	部件名	数据表	功能描述
Analog Devices	ADM1024	285Kb / 28P	System Hardware Monitor with Remote Diode Thermal Sensing REV.0
National Semiconductor ...	LM41	367Kb / 27P	Hardware Monitor with Thermal Diode Inputs and SensorPath??Bus
Texas Instruments	TMP141	295Kb / 19P	Digital Out Temperature Sensor with Single-Wire SensorPath Bus
National Semiconductor ...	LM32	340Kb / 24P	Dual Thermal Diode Temperature Sensor with SensorPath Bus
National Semiconductor ...	LM96011	80Kb / 2P	Hardware Monitor with Thermal Diode Input and SensorPath??Bus
ON Semiconductor	ADM1024	315Kb / 29P	System Hardware Monitor with Remote Diode Thermal Sensing April, 2012 ??Rev. 4
ADL Embedded Solutions	ADLQM67PC-3517UE	877Kb / 3P	Hardware monitor with api
ADL Embedded Solutions	ADLQM67PC	829Kb / 3P	hardware monitor with api
Texas Instruments	LM95010	1Mb / 28P	Digital Temperature Sensor with SensorPath Bus
ON Semiconductor	ADM1024	256Kb / 30P	System Hardware Monitor with Remote Diode Thermal Sensing January, 2016 ??Rev. 5