LM87 datasheet(1/32 Pages) NSC

部件名	LM87

功能描述	Serial Interface System Hardware Monitor with Remote Diode Temperature Sensing

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制造商	NSC [National Semiconductor (TI)]

网页	http://www.national.com

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LM87

Serial Interface System Hardware Monitor with Remote

Diode Temperature Sensing

General Description

The LM87 is a highly integrated data acquisition system for

hardware monitoring of servers, Personal Computers, or

virtually any microprocessor-based system. In a PC, the

LM87 can be used to monitor power supply voltages, moth-

erboard and processor temperatures, and fan speeds. Ac-

tual values for these inputs can be read at any time. Pro-

grammable WATCHDOG limits in the LM87 activate a fully

programmable and maskable interrupt system with two out-

puts (INT# and THERM#).

The LM87 has an on-chip digital output temperature sensor

with 8-bit resolution as well as the capability of monitoring 2

external diode temperatures to 8-bit resolution, an 8 channel

analog input ADC with 8-bit resolution and an 8-bit DAC. A

channel on the ADC measures the supply voltage applied to

the LM87, nominally 3.3 V. Two of the ADC inputs can be

redirected to a counter that can measure the speed of up to

2 fans. A slow speed

Σ∆ ADC architecture allows stable

measurement of signals in an extremely noisy environment.

The DAC, witha0to2.5V output voltage range, can be

used for fan speed control. Additional inputs are provided for

Chassis Intrusion detection circuits, and VID monitor inputs.

The VID monitor inputs can also be used as IRQ inputs if VID

monitoring is not required. The LM87 has a Serial Bus

interface that is compatible with SMBus™ and I

2C™.

Features

n

Remote diode temperature sensing (2 channels)

n

8 positive voltage inputs with scaling resistors for

monitoring +5 V, +12 V, +3.3 V, +2.5 V, Vccp power

supplies directly

n

2 inputs selectable for fan speed or voltage monitoring

n

8-bit DAC output for controlling fan speed

n

Chassis Intrusion Detector input

n

WATCHDOG comparison of all monitored values

n

SMBus or I

2C Serial Bus interface compatibility

n

VID0-VID4 or IRQ0-IRQ4 monitoring inputs

n

On chip temperature sensor

Key Specifications

j Voltage Monitoring Error

±2 % (max)

j External Temperature Error

±4 ˚C (max)

j Internal Temperature Error

−40 ˚C to +125 ˚C

± 3 ˚C (typ)

j Supply Voltage Range

2.8 to 3.8 V

j Supply Current

0.7 mA (typ)

j ADC and DAC Resolution

8 Bits

j Temperature Resolution

1.0 ˚C

Applications

n

System Thermal and Hardware Monitoring for Servers,

Workstations and PCs

n

Networking and Telecom Equipment

n

Office Electronics

n

Electronic Test Equipment and Instrumentation

Ordering Information

Temperature Range

NS Package

Number

−40 ˚C

≤ T

A

≤ +125 ˚C

Order Number

Device Marking

LM87CIMT

1

LM87CIMT

MTC24B

LM87CIMTX

2

LM87CIMT

MTC24B

Note: 1-Rail transport media, 61 parts per rail

2-Tape and reel transport media, 2500 parts per reel

Connection Diagram

10099503

SMBus™ is a trademark of the Intel Corporation.

December 2003

DS100995

www.national.com

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Texas Instruments	LM87	1Mb / 43P	Serial Interface System Hardware Monitor with Remote Diode Temperature Sensing
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