±1°C Remote Diode Temperature Sensor with PWM Fan Control and 5 GPIO's

±1°C Remote Diode Temperature Sensor with PWM Fan Control and 5 GPIO's - LM64


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 diode-connected 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.


  • Accurately Senses Remote and Local Diode Temperatures
  • Integrated PWM Fan Speed Control Output
  • Programmable 8-step Lookup Table for Quieting Fans
  • ALERT and T_Crit Open-drain Outputs
  • Tachometer Input for Measuring Fan RPM
  • 10 bit Plus Sign Remote Diode Temperature Data Format, with 0.125°C Resolution
  • SMBus 2.0 Compatible Interface, Supports TIMEOUT
  • 5 General Purpose Input/Output pins
  • 5 General Purpose Default input pins
  • 24-pin WQFN Package

Key Specifications

  • Remote Diode Temperature Accuracy (includes quantization error)
    • Ambient Temp30°C to 50°C0°C to 85°C
    • Diode Temp120°C to 140°C 25°C to 140°C
    • Max Error±1.0°C (max)±3.0°C (max)
  • Local Temp Accuracy (includes quantization error)
    • Ambient Temp 25°C to 125°C
    • Max Error ±3.0°C (max)
  • Power Supply Requirements
    • Supply DC Voltage 3.0 V to 3.6 V
    • Supply DC Current 1.1 mA (typ)

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Parametrics Compare all products in Monitoring & Fan Control

Analog Inputs
No. of Temperature Sensors
Operating Temperature Range (C)
Temperature Sensor Accuracy (C)
Temperature Sensor Resolution (C)
PWM Duty Cycle Resolution (bits)
Fan Speed Measurement Accuracy (%)
Interface Type
Fan Control Method
Fan Control Output(s)
TruTherm(TM) Beta Compensation
VID Inputs
Fan Speed Inputs
Interrupt Outputs (Count)
Quiescent Current (mA)
LM64 LM96163
0    0   
2    2   
24WQFN    10WSON   
0 to 125    -40 to 125   
1C max for 120C to 140C
3C max for 25C to 120C   
0.75C max for 50 to 105
1.5C max for 40 to 125
3C max for 25C to 125C   
0.125    0.125   
6    8   
10    7   
Catalog    Catalog   
SMBus    SMBus   
Lookup Table    Lookup Table 12 point   
1 PWM    1 PWM   
No    Yes   
0    0   
1    1   
1    2   
1.1    0.456