Datasheet > LM87

LM87

更新时间： 2024-11-03 11:10:19

品牌	Logo	应用领域
德州仪器 - TI		温度传感监控风扇传感器温度传感器
页数	文件大小	规格书
46页	1713K
描述
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

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LM87 数据手册

LM87

www.ti.com

SNAS034J –APRIL 2000–REVISED MARCH 2013

LM87 Serial Interface System Hardware Monitor with Remote Diode Temperature Sensing

Check for Samples: LM87

FEATURES

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, motherboard and processor

temperatures, and fan speeds. Actual values for

these inputs can be read at any time. Programmable

WATCHDOG limits in the LM87 activate a fully

programmable and maskable interrupt system with

two outputs (INT# and THERM#).

234

•

Remote diode temperature sensing (2

channels)

•

8 positive voltage inputs with scaling resistors

for monitoring +5 V, +12 V, +3.3 V, +2.5 V,

Vccp power supplies directly

2 inputs selectable for fan speed or voltage

monitoring

•

8-bit DAC output for controlling fan speed

Chassis Intrusion Detector input

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 ΣΔ 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™ and

I²C™.

WATCHDOG comparison of all monitored

values

SMBus™ or I²C Serial Bus interface

compatibility

•

VID0-VID4 or IRQ0-IRQ4 monitoring inputs

On chip temperature sensor

APPLICATIONS

•

System Thermal and Hardware Monitoring for

Servers, Workstations and PCs

•

Networking and Telecom Equipment

Office Electronics

Electronic Test Equipment and

Instrumentation

KEY SPECIFICATIONS

Connection Diagram

•

Voltage Monitoring Error ±2 % (max)

External Temperature Error ±4 °C (max)

Internal Temperature Error

–

−40 °C to +125 °C ± 3 °C (typ)

•

Supply Voltage Range 2.8 to 3.8 V

Supply Current 0.7 mA (typ)

ADC and DAC Resolution 8 Bits

Temperature Resolution 1.0 °C

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

SMBus is a trademark of Intel Corporation.

I²C is a trademark of dcl_owner.

All other trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

12 3 4 5 6 7...46

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与LM87相关器件

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

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