LM79CCVF

更新时间： 2024-11-22 22:28:23

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	484K
描述
Microprocessor System Hardware Monitor

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中文翻译

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数据手册

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LM79CCVF 数据手册

February 2000

LM79

Microprocessor System Hardware Monitor

General Description

Features

n Temperature sensing

The LM79 is a highly integrated Data Acquisition system for

hardware monitoring of servers, Personal Computers, or

virtually any microprocessor based system. In a PC, the

LM79 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 LM79 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 LM79 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 LM79 provides

inputs for three fan tachometer outputs. Additional inputs are

provided for Chassis Intrusion detection circuits, 5 VID moni-

tor inputs, and chainable interrupt. The LM79 provides both

ISA and Serial Bus interfaces. A 32-byte auto-increment

RAM is provided for POST (Power On Self Test) code stor-

age.

™

n ISA and I C Serial Bus interfaces

Key Specifications

1% (max)

Voltage monitoring

accuracy

Temperature Accuracy

−10˚C to +100˚C

3˚C (max)

Supply Voltage

Supply Current

Operating:

Shutdown:

1 mA typ

10 µA typ

8 Bits

Compared to the LM78, the LM79 has the following differ-

ences:

ADC Resolution

•

an additional VID input pin

an additional register for device identification

open drain Power Switch Bypass Output

Applications

n System Hardware Monitoring for Servers and PCs

n Office Electronics

n Electronic Test Equipment and Instrumentation

Ordering Information

Connection Diagram

Temperature Range

Package

−10˚C ≤ T_A≤ +100˚C

Order Number

Device Marking

LM79CCVF

VGZ44A

Indicates Active Low (“Not”)

DS100036-2

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

DS100036

www.national.com

12 3 4 5 6 7...31

中文翻译

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与LM79CCVF相关器件

型号	品牌	获取价格	描述	数据表
LM79CCVFX	TI	获取价格	SPECIALTY ANALOG CIRCUIT, PQFP44, 10 X 10 MM, PLASTIC, QFP-44
LM79GCP	TI	获取价格	IC,VOLT REGULATOR,ADJUSTABLE,-2.6 TO -30V,BIPOLAR,4PIN
LM79L	NSC	获取价格	3-Terminal Negative Regulators
LM79L	TI	获取价格	100mA 负电压线性稳压器
LM79L00	FCI	获取价格	LM79L00 Series 3-Terminal Negative Output voltage Regulators
LM79L00_1	FCI	获取价格	LM79L00 Series 3-Terminal Negative Output Voltage Regulators
LM79L00D	FCI	获取价格	LM79L00 Series 3-Terminal Negative Output Voltage Regulators
LM79L00H	FCI	获取价格	LM79L00 Series 3-Terminal Negative Output Voltage Regulators
LM79L00LP	FCI	获取价格	LM79L00 Series 3-Terminal Negative Output Voltage Regulators
LM79L05	KEXIN	获取价格	Three-terminal negative voltage regulator

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