LM63 Datasheet

±1°C/±3°C Accurate Remote Diode Digital Temperature Sensor with Integrated 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 ASICs. The LM63 remote temperature sensors 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,
• 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
• LM86-Compatible Pinout
• LM86-Compatible Register Set
• 8-Pin SOIC Package

• Computer Processor Thermal Management
   (Laptop, Desktop, Workstations, Servers)
• Graphics Processor Thermal Management
• Electronic Test Equipment
• Projectors
• Office Equipment
• Industrial Controls



Manufacturer information


Texas Instruments introduction - Texas Instruments Incorporated (TI) is a global semiconductor design and manufacturing company that develops analog ICs and embedded processors. By employing the world's brightest minds, TI creates innovations that shape the future of technology. TI is helping more than 100,000 customers transform the future, today.

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