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參數(shù)資料
| 型號： | LM79CCVFX |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 模擬信號調(diào)理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PQFP44 |
| 封裝： | 10 X 10 MM, PLASTIC, QFP-44 |
| 文件頁數(shù)： | 1/31頁 |
| 文件大?。?/td> | 469K |
| 代理商： | LM79CCVFX |
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LM79
Microprocessor System Hardware Monitor
General Description
The LM79 is a highly integrated Data Acquisition system for
hardware monitoring of servers, Personal Computers, or vir-
tually any microprocessor based system. In a PC, the LM79
can be used to monitor power supply voltages, tempera-
tures, 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 inter-
rupt system with two outputs.
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.
Compared to the LM78, the LM79 has the following differ-
ences:
an additional VID input pin
an additional register for device identification
open drain Power Switch Bypass Output
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
n
Voltage monitoring accuracy
±1% (max)
n
Temperature Accuracy
10C to +100C
±3C (max)
n
Supply Voltage
5V
n
Supply Current
Operating:
1 mA typ
Shutdown:
10 A typ
n
ADC Resolution
8 Bits
Applications
n
System Hardware Monitoring for Servers and PCs
n
Office Electronics
n
Electronic Test Equipment and Instrumentation
Ordering Information
Temperature Range
Package
10C
≤ T
A ≤ +100C
Order Number
Device Marking
LM79CCVF
VGZ44A
# Indicates Active Low (“Not”)
Connection Diagram
TRI-STATE is a registered trademark of National Semiconductor Corporation.
WATCHDOG is a trademark of National Semiconductor Corporation.
I2C is a registered trademark of the Phillips Corporation.
DS100036-2
February 2000
LM79
Microprocessor
System
Hardware
Monitor
2000 National Semiconductor Corporation
DS100036
www.national.com
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