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LM64

National Semiconductor
Part Number LM64
Manufacturer National Semiconductor
Description 1C Remote Diode Temperature Sensor
Published Mar 22, 2005
Detailed Description LM64 ± 1˚C Remote Diode Temperature Sensor with PWM Fan Control and 5 GPIO’s December 2003 LM64 ± 1˚C Remote Diode Tem...
Datasheet PDF File LM64 PDF File

LM64
LM64

Overview
LM64 ± 1˚C Remote Diode Temperature Sensor with PWM Fan Control and 5 GPIO’s December 2003 LM64 ± 1˚C Remote Diode Temperature Sensor with PWM Fan Control and 5 GPIO’s General Description The LM64 is a remote diode temperature sensor with PWM fan control.
The LM64 accurately measures its own temperature and that of a remote diode.
The LM64 remote temperature accuracy is factory trimmed for a MMBT3904 diodeconnected transistor with a 16˚C offset for high temperatures.
TACTUAL DIODE JUNCTION = TLM64 + 16˚C The LM64 features a PWM, open-drain, fan control output, 5 GPIO (General Purpose Input/Output) and 5 GPD (General Purpose Default) pins.
The 8-step Lookup Table allows for a non-linear fan speed vs.
temperature transfer function often used to quiet acoustic fan noise.
Key Specifications n Remote Diode Temperature Accuracy (includes quantization error) Ambient Temp 30˚C to 50˚C 0˚C to 85˚C Diode Temp 120˚C to 140˚C 25˚C to 140˚C Max Error ± 1.
0˚C (max) ± 3.
0˚C (max) n Local Temp Ac...


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