Datasheet > LM78

LM78

更新时间： 2024-11-25 22:47:03

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
31页	427K
描述
Microprocessor System Hardware Monitor

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LM78 数据手册

February 2000

LM78

Microprocessor System Hardware Monitor

General Description

Features

n Temperature sensing

The LM78 is a highly integrated Data Acquisition system for

hardware monitoring of servers, Personal Computers, or

virtually any microprocessor based system. In a PC, the

LM78 can be used to monitor power supply voltages, tem-

peratures, and fan speeds. Actual values for these inputs

can be read at any time, and programmable WATCHDOG

limits in the LM78 activate a fully programmable and

maskable interrupt system with two outputs.

n 5 positive voltage inputs

n 2 op amps for negative voltage monitoring

n 3 fan speed monitoring inputs

n Input for additional temperature sensors

n Chassis Intrusion Detector input

n WATCHDOG comparison of all monitored values

n POST code storage RAM

The LM78 has an on-chip temperature sensor, 5 positive

analog inputs, two inverting inputs (for monitoring negative

voltages), and an 8-bit ADC. An input is provided for the

overtemperature outputs of additional temperature sensors

and this is linked to the interrupt system. The LM78 provides

inputs for three fan tachometer outputs. Additional inputs are

provided for Chassis Intrusion detection circuits, VID monitor

inputs, and chainable interrupt. The LM78 provides both ISA

and Serial Bus interfaces. A 32-byte auto-increment RAM is

provided for POST (Power On Self Test) code storage.

™

n ISA and I C Serial Bus interfaces

Key Specifications

Voltage monitoring

accuracy

1% (max)

Temperature Accuracy

−10˚C to +100˚C

3˚C (max)

Supply Voltage

Supply Current

Operating:

Shutdown:

1 mA typ

10 µA typ

8 Bits

Applications

n System Hardware Monitoring for Servers and PCs

n Office Electronics

ADC Resolution

n Electronic Test Equipment and Instrumentation

Typical Application

DS012873-1

# indicates Active Low (”Not“)

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

DS012873

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