Microprocessor System Hardware Monitor


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PDIP (NFG) 16 52 mm² 6.35 x 8.26 open-in-new Find other Inductive sensor AFEs


  • 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

Voltage monitoring accuracy   ±1% (max)
Temperature Accuracy -10°C to +100°C   ±3°C (max)
Supply Voltage   5V
Supply Current Operating: 1 mA typ
  Shutdown: 10 µA typ
ADC Resolution   8 Bits

I2C® is a registered trademark of the Phillips Corporation.

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The LM78 is a highly integrated Data Acquisition system for hardware monitoring of servers, Personal Computers, or virtually any microprocessor based system. In a PC, the LM78 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 LM78 activate a fully programmable and maskable interrupt system with two outputs.

The LM78 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 LM78 provides inputs for three fan tachometer outputs. Additional inputs are provided for Chassis Intrusion detection circuits, VID monitor inputs, and chainable interrupt. The LM78 provides both ISA and Serial Bus interfaces. A 32-byte auto-increment RAM is provided for POST (Power On Self Test) code storage.

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Technical documentation

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Type Title Date
* Datasheet LM78 Microprocessor System Hardware Monitor datasheet (Rev. B) May 14, 2004
Application notes A Topical Index of TI LDO Application Notes (Rev. F) Jun. 27, 2019
Application notes AN-1028 Maximum Power Enhancement Techniques for Power Packages (Rev. B) May 06, 2013
Application notes AN-103 LM340 Series Three Terminal Positive Regulators (Rev. A) May 06, 2013
Application notes AN-1148 Linear Regulators: Theory of Operation and Compensation (Rev. B) May 06, 2013
Application notes Packaging Limits Range of Linear Regulators May 08, 2010
Application notes Digital Designer's Guide to Linear Voltage Regulators & Thermal Mgmt (LDO) (Rev. A) Jun. 04, 2008
White papers Engineers note: Capacitors are key to voltage regulator design Jul. 01, 2002
Application notes Understanding the Terms and Definitions of LDO Voltage Regulators Oct. 21, 1999

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