Datasheet > LM81CIMT-31

LM81CIMT-31

更新时间： 2024-11-23 22:47:03

品牌	Logo	应用领域
美国国家半导体 - NSC		微处理器
页数	文件大小	规格书
32页	415K
描述
Serial Interface ACPI-Compatible Microprocessor System

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中文翻译

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数据手册

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LM81CIMT-31 数据手册

June 1999

LM81

Serial Interface ACPI-Compatible Microprocessor System

Hardware Monitor

n 2 fan speed monitoring inputs

n Chassis Intrusion Detector input

General Description

The LM81 is a highly integrated data acquisition system for

™

n WATCHDOG comparison of all monitored values

hardware monitoring of servers, Personal Computers, or vir-

tually any microprocessor-based system. In a PC, the LM81

can be used to monitor power supply voltages, tempera-

tures, and fan speeds. Actual values for these inputs can be

n SMBus Serial Bus interface compatibility

n VID0-VID4 monitoring inputs

™

read at any time. Programmable WATCHDOG limits in the

Key Specifications

LM81 activate a fully programmable and maskable interrupt

system with two outputs (INT and T_CRIT_).

n Voltage monitoring

Error

+2% (max)

The LM81 has an on-chip digital output temperature sensor

with 9-bit or 12-bit resolution, a 6 analog input ADC with 8-bit

resolution and an 8-bit DAC. Two fan tachometer outputs

can be measured with the LM81’s FAN1 and FAN2 inputs.

The DAC, with a 0 to 1.25V output voltage range, can be

used for fan speed control. Additional inputs are provided for

Chassis Intrusion detection circuits, and VID monitor inputs.

The LM81 has a Serial Bus interface that is compatible with

n Temperature Error

−40˚C to +125˚C

3˚C (max)

n Supply Voltage Range

n Supply Current

2.8V to 3.8V

0.4 mA (typ)

8 Bits

Operating:

n ADC and DAC Resolution

n Temperature Resolution

0.5˚C

™

SMBus

Applications

n System Thermal and Hardware Monitoring for Servers

and PCs

Features

n Temperature sensing

n 6 positive voltage inputs with scaling resistors for

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

supplies directly

n Office Electronics

n Electronic Test Equipment and Instrumentation

n 8-bit DAC output for controlling fan speed

Typical Application

DS100072-1

# Indicates Active Low (“Not”)

TRI-STATE^®is a registered trademark of National Semiconductor Corporation.

™

WATCHDOG is a trademark of National Semiconductor Corporation.

™

SMBus is a trademark of the Intel Corporation.

DS100072

www.national.com

12 3 4 5 6 7...32

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与LM81CIMT-31相关器件

型号	品牌	获取价格	描述	数据表
LM81CIMTX-3	NSC	获取价格	Serial Interface ACPI-Compatible Microprocessor System Hardware Monitor
LM81CIMTX-3/NOPB	TI	获取价格	本地温度传感器、风扇控制、硬件和 6 个电源电压监控器 \| PW \| 24 \| -40 t
LM81CIMTX-32	NSC	获取价格	Serial Interface ACPI-Compatible Microprocessor System
LM82	NSC	获取价格	Remote Diode and Local Digital Temperature Sensor with Two-Wire Interface
LM82	TI	获取价格	具有 SMBus 和 I2C 接口的远程和本地温度传感器
LM82_04	NSC	获取价格	Remote Diode and Local Digital Temperature Sensor with Two-Wire Interface
LM8204	ETC	获取价格	电话机集成电路互换表
LM8207	NSC	获取价格	TFT 18 Gamma Buffer + VCOM Driver + Voltage Reference
LM8207MT	NSC	获取价格	TFT 18 Gamma Buffer + VCOM Driver + Voltage Reference
LM8207MTX	NSC	获取价格	TFT 18 Gamma Buffer + VCOM Driver + Voltage Reference

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