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LM79

National Semiconductor
Part Number LM79
Manufacturer National Semiconductor
Description Microprocessor System Hardware Monitor
Published Mar 22, 2005
Detailed Description LM79 Microprocessor System Hardware Monitor February 2000 LM79 Microprocessor System Hardware Monitor General Descript...
Datasheet PDF File LM79 PDF File

LM79
LM79

Overview
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, temperatures, 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 monitor 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 storage.
Compared to the LM78, the LM79 has the following differences: 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 I2C™ Serial Bus interfaces Key Specifications j Voltage monitoring accuracy j Temperature Accuracy ± 1% (max) −10˚C to +100˚C j Supply Voltage j Supply Current j ADC Resolution ± 3˚C (max) 5V Operating: Shutdown: 1 mA typ 10 µA typ 8 Bits • • • 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 Instrumentati...


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