LM64
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 Accuracy (includes quantization error) Ambient Temp 25˚C to 125˚C n Power Supply Requirements Max Error
± 3.0˚C (max)
Features n n n n n n n n n n Accurately senses remote and...
