1 remote and local temp sensor with fan control and 5 voltage monitors


Product details


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Package | Pins | Size

WQFN (NHW) 24 20 mm² 5 x 4 open-in-new Find other Signal conditioners


  • 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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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.

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Technical documentation

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Type Title Date
* Datasheet LM64 +-1C Remote Diode Temp Sensor w/PWM Fan Cntrl & 5 GPIO's datasheet (Rev. A) Mar. 22, 2013
Technical articles SigCon Architect: The keys to your high-speed design Oct. 27, 2015
Technical articles Make signal conditioning easy with WEBENCH® Interface Designer Jan. 27, 2015
Technical articles Get Connected: Equalization Oct. 15, 2014
Technical articles One part for all: Multi-standard signal conditioners Mar. 07, 2014
User guides LM63LM64LM96x63EVM User's Guide Oct. 15, 2013
User guides ±1°C Remote Diode Temp Sensor with PWM Fan Control and 5 GPIO`s User Guide Jan. 26, 2012

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Hardware development

document-generic User guide

The LM63LM64LM96x63EVM evaluation module (EVM) enables designers to immediately start evaluating the operation and performance of the LM63, LM64, LM96063, and LM96163 remote digital temperature sensor / fan controller family of ICs. All four devices can be evaluated by clicking on the appropriate (...)

  • Evaluate LM63, LM64, LM96063, LM96163 fan controller family
  • Device selection via I2C switch
  • User friendly GUI interface
  • 3-pin or 4-pin fans pluggable through on-board connector
  • Powered by USB
  • Users may connect their own remote temperature diode

Software development

Eval Board Software for Hardware Monitors and Digital Temp Sensors
DIGITALTEMPSENSORSEVM-SW — Evaluation Board Software for Hardware Monitors and Digital Temperature Sensors
Linux Driver for LM63
LM63SW-LINUX The Linux driver supports the LM63 series of Remote Diode Temperature Sensors. The Linux driver supports communication through the I2C bus and interfaces with the Hardware Monitoring sub-system.
Linux Mainline Status

Available in Linux Main line: Yes
Available through git.ti.com: N/A

Supported Devices:
  • (...)
Eval Board Software For Hardware Monitors And Digital Temperature Sensors
SensorEval software supports the latest TI temperature sensor and hardware monitor evaluation boards via USB interface. It also allows access to sensors mounted directly on motherboards that support Intel chip sets.

  • Download SensorEval Software and Manual
  • Windows XP support is offered for (...)

CAD/CAE symbols

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WQFN (NHW) 24 View options

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