LM63 1 remote and local temperature sensor with fan control | TI.com

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1 remote and local temperature sensor with fan control



The LM63 is a remote diode temperature sensor with integrated fan control. The LM63 accurately measures: (1) its own temperature and (2) the temperature of a diode-connected transistor, such as a 2N3904, or a thermal diode commonly found on Computer Processors, Graphics Processor Units (GPU) and other ASIC's. The LM63 remote temperature sensor's accuracy is factory trimmed for the series resistance and 1.0021 non-ideality of the Intel 0.13 µm Pentium 4 and Mobile Pentium 4 Processor-M thermal diode. The LM63 has an offset register to correct for errors caused by different non-ideality factors of other thermal diodes.

The LM63 also features an integrated, pulse-width-modulated (PWM), open-drain fan control output. Fan speed is a combination of the remote temperature reading, the lookup table and the register settings. The 8-step Lookup Table enables the user to program a non-linear fan speed vs. temperature transfer function often used to quiet acoustic fan noise.


  • Accurately Senses Diode-Connected 2N3904 Transistors or Thermal Diodes On Board Large Processors or ASICs
  • Accurately Senses its Own Temperature
  • Factory Trimmed for Intel Pentium 4 and Mobile Pentium 4 Processor-M Thermal Diodes
  • Integrated PWM Fan Speed Control Output
  • Acoustic Fan Noise Reduction With User-Programmable 8-Step Lookup Table
  • Multi-Function, User-Selectable Pin for Either ALERT Output, or Tachometer Input, Functions
  • Tachometer Input for Measuring Fan RPM
  • Smart-Tach Modes for Measuring RPM of Fans With Pulse-Width-Modulated Power as Shown in Typical Application
  • Offset Register can Adjust for a Variety of Thermal Diodes
  • 10 Bit Plus Sign Remote Diode Temperature Data Format, With 0.125°C Resolution
  • SMBus 2.0 Compatible Interface, Supports TIMEOUT
  • LM86-Compatible Pinout
  • LM86-Compatible Register Set
  • 8-Pin SOIC Package

Intel is a trademark of Texas Instruments. Pentium is a trademark of Texas Instruments. All trademarks are the property of their respective owners.


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Part number Order Device type Interface Local sensor accuracy (Max) (+/- C) Temp resolution (Max) (bits) Operating temperature range (C) Supply voltage (Min) (V) Supply voltage (Max) (V) Supply current (Max) (uA) Features Remote channels (#) Addresses Rating Package Group Package size: mm2:W x L (PKG)
LM63 Order now Fan Controller     SMBus     3     8     0 to 125     3     3.6     2000     1 PWM output with an 8-step lookup table, 1 tachometer input, ALERT, TCRIT     1     1     Catalog     SOIC | 8     8SOIC: 19 mm2: 3.91 x 4.9 (SOIC | 8)    
LM96163 Order now Fan Controller     I2C, SMBus, 2-Wire     3     11     -40 to 125     3     3.6     825     lookup table
1 tachometer input
remote diode beta compensation    
1     1     Catalog     WSON | 10     10WSON: 9 mm2: 3 x 3 (WSON | 10)