LM87

更新时间： 2024-01-21 23:42:16

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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技术参数
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LM87 技术参数

是否无铅：	不含铅	是否Rohs认证：	符合
生命周期：	Active	零件包装代码：	TSSOP
包装说明：	TSSOP,	针数：	24
Reach Compliance Code：	compliant	ECCN代码：	EAR99
HTS代码：	8542.39.00.01	Factory Lead Time：	1 week
风险等级：	1	可调阈值：	NO
模拟集成电路 - 其他类型：	POWER SUPPLY MANAGEMENT CIRCUIT	JESD-30 代码：	R-PDSO-G24
JESD-609代码：	e3	长度：	7.8 mm
湿度敏感等级：	1	信道数量：	14
功能数量：	1	端子数量：	24
最高工作温度：	125 °C	最低工作温度：	-40 °C
封装主体材料：	PLASTIC/EPOXY	封装代码：	TSSOP
封装形状：	RECTANGULAR	封装形式：	SMALL OUTLINE, THIN PROFILE, SHRINK PITCH
峰值回流温度（摄氏度）：	260	认证状态：	Not Qualified
座面最大高度：	1.2 mm	最大供电电流 (Isup)：	1.2 mA
最大供电电压 (Vsup)：	3.8 V	最小供电电压 (Vsup)：	2.8 V
标称供电电压 (Vsup)：	3.3 V	表面贴装：	YES
温度等级：	AUTOMOTIVE	端子面层：	Matte Tin (Sn)
端子形式：	GULL WING	端子节距：	0.65 mm
端子位置：	DUAL	处于峰值回流温度下的最长时间：	NOT SPECIFIED
宽度：	4.4 mm

LM87 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

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与LM87相关器件

型号	品牌	描述	获取价格	数据表
LM87CIMT	NSC	Serial Interface System Hardware Monitor with Remote Diode Temperature Sensing	获取价格
LM87CIMT	TI	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 \|	获取价格
LM87CIMT/NOPB	NSC	IC 14-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDSO24, TSSOP-24, Power Management Circuit	获取价格
LM87CIMT/NOPB	TI	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 \|	获取价格
LM87CIMTX	NSC	Serial Interface System Hardware Monitor with Remote Diode Temperature Sensing	获取价格
LM87CIMTX/NOPB	NSC	IC 14-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDSO24, TSSOP-24, Power Management Circuit	获取价格

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