Datasheet > LM80_01

LM80_01

更新时间： 2024-11-30 03:51:39

品牌	Logo	应用领域
美国国家半导体 - NSC		微处理器监控
页数	文件大小	规格书
29页	441K
描述
Serial Interface ACPI-Compatible Microprocessor System Hardware Monitor

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LM80_01 数据手册

June 2001

LM80

Serial Interface ACPI-Compatible Microprocessor System

Hardware Monitor

n WATCHDOG comparison of all monitored values

n Separate input to show status in Interrupt Status

as the LM56 or LM75

n I²C Serial Bus interface compatibility

n Shutdown mode to minimize power consumption

n Programmable RST_OUT/OS pin: RST_OUT provides a

Reset output; OS provides an Interrupt Output activated

by an Overtemperature Shutdown event

General Description

The LM80 provides 7 positive voltage inputs, temperature

measurement, fan speed measurement, and hardware

™

monitoring on an I C

interface. The LM80 performs

WATCHDOG comparisons of all measured values and an

open-drain interrupt output becomes active when any values

exceed programmed limits. A Chassis Intrusion input is pro-

vided to monitor and reset an external circuit designed to

latch a chassis intrusion event.

The LM80 is especially suited to interface to both linear and

digital temperature sensors. The 10 mV LSB and 2.56 volt

input range is ideal for accepting inputs from a linear sensor

such as the LM50. The BTI is used as an input from either

digital or thermostat sensors such as LM75 and LM56.

Key Specifications

1% (max)

Voltage monitoring Error

Temperature Error

−25˚C to +125˚C

3˚C (max)

The LM80’s 2.8V to 5.75V supply voltage range, low supply

current, and I²C interface make it ideal for a wide range of

applications. These include hardware monitoring and protec-

tion applications in personal computers, electronic test

equipment, and office electronics.

Supply Voltage Range

2.8V to

5.75V

Supply Current

Operating:

Shutdown:

0.2 mA typ

15 µA typ

8 Bits

ADC Resolution

Features

n Temperature sensing

Temperature Resolution

0.5˚C

n 7 positive voltage inputs

n 2 programmable fan speed monitoring inputs

n 10 mV LSB and 2.56V input range accepts outputs from

linear temperature sensors such as the LM50

n Chassis Intrusion Detector input

Applications

n System Thermal and Hardware Monitoring for Servers

and PCs

n Office Electronics

n Electronic Test Equipment and Instrumentation

Typical Application

DS100040-1

# Indicates Active Low (“Not”)

C^®is a registered trademark of the Philips Corporation.

DS100040

www.national.com

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