LM87CIMTX National Semiconductor, LM87CIMTX Datasheet

LM87CIMTX

Manufacturer Part Number

LM87CIMTX

Description

IC,Data Acquisition System,8-CHANNEL,8-BIT,TSSOP,24PIN,PLASTIC

Manufacturer

National Semiconductor

Datasheets

1.LM87CIMTX.pdf (32 pages)

2.LM87CIMTX.pdf (32 pages)

Specifications of LM87CIMTX

Lead Free Status / RoHS Status

Contains lead / RoHS non-compliant

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Download datasheet (471Kb)

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, with a 0 to 2.5 V 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

Features

n Remote diode temperature sensing (2 channels)

n 8 positive voltage inputs with scaling resistors for

Ordering Information

Note:

SMBus

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

supplies directly

Order Number

LM87CIMTX

LM87CIMT

™

-Rail transport media, 61 parts per rail

-Tape and reel transport media, 2500 parts per reel

is a trademark of the Intel Corporation.

−40 ˚C ≤ T

Temperature Range

≤ +125 ˚C

Device Marking

LM87CIMT

™

DS100995

and I

NS Package

MTC24B

Number

™

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

n VID0-VID4 or IRQ0-IRQ4 monitoring inputs

n On chip temperature sensor

Key Specifications

Applications

n System Thermal and Hardware Monitoring for Servers,

n Networking and Telecom Equipment

n Office Electronics

n Electronic Test Equipment and Instrumentation

Connection Diagram

Workstations and PCs

Voltage Monitoring Error

External Temperature Error

Internal Temperature Error

Supply Voltage Range

Supply Current

ADC and DAC Resolution

Temperature Resolution

−40 ˚C to +125 ˚C

C Serial Bus interface compatibility

December 2003

www.national.com

0.7 mA (typ)

2.8 to 3.8 V

4 ˚C (max)

2 % (max)

3 ˚C (typ)

10099503

1.0 ˚C

8 Bits

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