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LM79 Datasheet(PDF) 1 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
Part No. LM79
Description  Microprocessor System Hardware Monitor
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Maker  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
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LM79 Datasheet(HTML) 1 Page - National Semiconductor (TI)

 
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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
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.
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
2CSerial 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
Applications
n
System Hardware Monitoring for Servers and PCs
n
Office Electronics
n
Electronic Test Equipment and Instrumentation
Ordering Information
Temperature Range
Package
−10˚C
≤ T
A ≤ +100˚C
Order Number
Device Marking
LM79CCVF
LM79CCVF
VGZ44A
# Indicates Active Low (“Not”)
Connection Diagram
I2C® is a registered trademark of the Phillips Corporation.
DS100036-2
February 2000
© 2001 National Semiconductor Corporation
DS100036
www.national.com


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