LM78 datasheet(1/31 Pages) NSC

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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

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

2C™ Serial Bus interfaces

Key Specifications

j Voltage monitoring

accuracy

±1% (max)

j Temperature Accuracy

−10˚C to +100˚C

±3˚C (max)

j Supply Voltage

5V

j Supply Current

Operating:

1 mA typ

Shutdown:

10 µA typ

j ADC Resolution

8 Bits

Typical Application

I2C® is a registered trademark of the Phillips Corporation.

DS012873-1

# indicates Active Low (”Not“)

February 2000

DS012873

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Số phần tương tự - LM78

nhà sản xuất	tên linh kiện	bảng dữ liệu	Giải thích chi tiết về linh kiện
TAITRON Components Inco...	LM78	379Kb / 12P	1A Positive Voltage Regulator
Texas Instruments	LM78	2Mb / 28P	LM340-N/LM78XX Series 3-Terminal Positive Regulators
First Components Intern...	LM7800	621Kb / 8P	LM7800 Series 3-Terminal fixed Voltage Regulators
National Semiconductor ...	LM7800	303Kb / 10P	3-Terminal Positive Voltage Regulators
Texas Instruments	LM7800	2Mb / 37P	LM340, LM340A and LM7805 Family Wide VIN 1.5-A Fixed Voltage Regulators REVISED SEPTEMBER 2016

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Mô tả tương tự - LM78

nhà sản xuất	tên linh kiện	bảng dữ liệu	Giải thích chi tiết về linh kiện
National Semiconductor ...	LM79	481Kb / 31P	Microprocessor System Hardware Monitor
National Semiconductor ...	LM80	435Kb / 29P	Serial Interface ACPI-Compatible Microprocessor System Hardware Monitor
Analog Devices	ADM1021	139Kb / 12P	Low Cost Microprocessor System Temperature Monitor REV.0
Analog Devices	ADM9240	280Kb / 22P	Low Cost Microprocessor System Hardware Monitor REV.0
National Semiconductor ...	LM80	440Kb / 29P	Serial Interface ACPI-Compatible Microprocessor System Hardware Monitor
National Semiconductor ...	LM81	419Kb / 33P	Serial Interface ACPI-Compatible Microprocessor System Hardware Monitor
Analog Devices	ADM9240ARU-REEL	288Kb / 22P	Low Cost Microprocessor System Hardware Monitor REV. 0
ON Semiconductor	ADM9240	5Mb / 22P	Low Cost Microprocessor System Hardware Monitor May 2010 - Rev.2
Texas Instruments	LM80	1Mb / 35P	Serial Interface ACPI-Compatible Microprocessor System Hardware Monitor
Texas Instruments	LM81	2Mb / 43P	Serial Interface ACPI-Compatible Microprocessor System Hardware Monitor

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