LM87CIMTX

更新时间： 2024-09-14 21:53:47

品牌	Logo	应用领域
美国国家半导体 - NSC		二极管传感器温度传感器监控
页数	文件大小	规格书
32页	464K
描述
Serial Interface System Hardware Monitor with Remote Diode Temperature Sensing

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中文翻译

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数据手册
替代型号

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LM87CIMTX 数据手册

December 2003

LM87

Serial Interface System Hardware Monitor with Remote

Diode Temperature Sensing

n 2 inputs selectable for fan speed or voltage monitoring

n 8-bit DAC output for controlling fan speed

The LM87 is a highly integrated data acquisition system for

n Chassis Intrusion Detector input

General Description

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-

n WATCHDOG comparison of all monitored values

n SMBus or I²C Serial Bus interface compatibility

n VID0-VID4 or IRQ0-IRQ4 monitoring inputs

n On chip temperature sensor

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-

Key Specifications

puts (INT and THERM ).

Voltage Monitoring Error

External Temperature Error

Internal Temperature Error

−40 ˚C to +125 ˚C

2 % (max)

4 ˚C (max)

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

3 ˚C (typ)

2.8 to 3.8 V

0.7 mA (typ)

8 Bits

Supply Voltage Range

Supply Current

ADC and DAC Resolution

Temperature Resolution

1.0 ˚C

Applications

n System Thermal and Hardware Monitoring for Servers,

Workstations and PCs

monitoring is not required. The LM87 has a Serial Bus

™

interface that is compatible with SMBus and I C

n Networking and Telecom Equipment

n Office Electronics

n Electronic Test Equipment and Instrumentation

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

Ordering Information

Connection Diagram

Temperature Range

NS Package

Number

−40 ˚C ≤ T_A≤ +125 ˚C

Order Number

LM87CIMT¹

Device Marking

LM87CIMT

MTC24B

LM87CIMTX²

LM87CIMT

Note: -Rail transport media, 61 parts per rail

-Tape and reel transport media, 2500 parts per reel

10099503

™

SMBus is a trademark of the Intel Corporation.

DS100995

www.national.com

12 3 4 5 6 7...32

中文翻译

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LM87CIMTX 替代型号

型号	品牌	替代类型	描述	数据表
LM87CIMT/NOPB	TI	功能相似	具有 2 条远程和 1 条本地通道的温度传感器、风扇控制、硬件和 8 个电源电压监控器 \|
ADM1024ARUZ	ONSEMI	功能相似	System Hardware Monitor with Remote Diode Thermal Sensing
ADM1024ARUZ-REEL	ONSEMI	功能相似	System Hardware Monitor with Remote Diode Thermal Sensing

与LM87CIMTX相关器件

型号	品牌	获取价格	描述	数据表
LM87CIMTX/NOPB	NSC	获取价格	IC 14-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDSO24, TSSOP-24, Power Management Circuit
LM87CIMTX/NOPB	TI	获取价格	具有 2 条远程和 1 条本地通道的温度传感器、风扇控制、硬件和 8 个电源电压监控器 \|
LM88	NSC	获取价格	Factory Programmable Dual Remote-Diode Thermostat
LM8801	NSC	获取价格	High Precision 6MHz, 600 mA Synchronous Step-Down DC-DC Converter for Mobile Applications
LM8801	TI	获取价格	High Precision 6MHz, 600 mA Synchronous Step-Down DC-DC Converter for Mobile Applications
LM8801_15	TI	获取价格	High Precision 6MHz, 600 mA Synchronous Step-Down DC-DC Converter for Mobile Applications
LM8801TME-1.2/NOPB	TI	获取价格	High Precision 6MHz, 600 mA Synchronous Step-Down DC-DC Converter for Mobile Applications
LM8801TME-1.82	NSC	获取价格	High Precision 6MHz, 600 mA Synchronous Step-Down DC-DC Converter for Mobile Applications
LM8801TME-1.82/NOPB	TI	获取价格	High Precision 6MHz, 600 mA Synchronous Step-Down DC-DC Converter for Mobile Applications
LM8801TME-2.9/NOPB	TI	获取价格	High Precision 6MHz, 600 mA Synchronous Step-Down DC-DC Converter for Mobile Applications

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