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.
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