LM78 National Semiconductor, LM78 Datasheet

LM78

Manufacturer Part Number

LM78

Description

Microprocessor System Hardware Monitor

Manufacturer

National Semiconductor

Datasheet

1.LM78.pdf (31 pages)

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LM78

Microprocessor System Hardware Monitor

General Description

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.

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.

Applications

n System Hardware Monitoring for Servers and PCs

n Office Electronics

n Electronic Test Equipment and Instrumentation

Typical Application

# indicates Active Low (”Not“)

I 2 C

is a registered trademark of the Phillips Corporation.

DS012873

Features

n Temperature sensing

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

n ISA and I

Key Specifications

Voltage monitoring

Temperature Accuracy

Supply Voltage

Supply Current

ADC Resolution

accuracy

−10˚C to +100˚C

™

Serial Bus interfaces

Shutdown:

Operating:

DS012873-1

February 2000

www.national.com

3˚C (max)

10 µA typ

1% (max)

1 mA typ

8 Bits

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