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LM79 Datasheet

  • LM79

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LM79 Microprocessor System Hardware Monitor
February 2000
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:
Features
n
n
n
n
n
n
n
n
n
Temperature sensing
5 positive voltage inputs
2 op amps for negative voltage monitoring
3 fan speed monitoring inputs
Input for additional temperature sensors
Chassis Intrusion Detector input
WATCHDOG comparison of all monitored values
POST code storage RAM
ISA and I
2
C
鈩?/div>
Serial Bus interfaces
Key Specifications
j
Voltage monitoring
鹵
1% (max)
accuracy
j
Temperature Accuracy
鈭?0藲C to +100藲C
j
Supply Voltage
j
Supply Current
j
ADC Resolution
鹵
3藲C (max)
5V
Operating:
Shutdown:
1 mA typ
10 碌A typ
8 Bits
鈥?/div>
an additional VID input pin
鈥?/div>
an additional register for device identification
鈥?/div>
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
Temperature Range
鈭?0藲C
鈮?/div>
T
A
鈮?/div>
+100藲C
Order Number
LM79CCVF
Device Marking
LM79CCVF
VGZ44A
Package
Connection Diagram
#
Indicates Active Low (鈥淣ot鈥?
DS100036-2
I2C
廬
is a registered trademark of the Phillips Corporation.
漏 2001 National Semiconductor Corporation
DS100036
www.national.com

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