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LM64 - 1C Remote Diode Temperature Sensor

Datasheet Summary

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.

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 Accuracy (includes quantization.

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Datasheet Details

Part number LM64
Manufacturer National Semiconductor
File Size 376.58 KB
Description 1C Remote Diode Temperature Sensor
Datasheet download datasheet LM64 Datasheet
Additional preview pages of the LM64 datasheet.

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Full PDF Text Transcription

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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.
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