LM63

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LM63 Features

• Accurately senses diode-connected 2N3904 transistors or thermal diodes on-board large processors or ASIC's
• 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
• 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

LM63 Description

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. For the latest information contact hardware.monitor.team@nsc.com.

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.

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