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

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