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The TC655 is a dual PWM mode fan speed controller with FanSense™ TM technology for use with brush-less DC motors


  • Download » Datasheet PDF, 585 Kb, File published: Aug 7, 2014
    TC654/TC655 Data Sheet
    Docket ↓
    Dual SMBusв„ў PWM Fan Speed Controllers With
    Fan Fault Detection
    Features: Description: Temperature Proportional Fan Speed for Reduced
    Acoustic Noise and Longer Fan Life FanSenseв„ў Protects against Fan Failure and
    Eliminates the Need for 3-wire Fans Overtemperature Detection (TC655) Efficient PWM Fan Drive Provides RPM Data 2-Wire SMBusв„ў-Compatible Interface Supports Any Fan Voltage Software Controlled Shutdown Mode for "Green"
    Systems Supports Low-Cost NTC/PTC Thermistors Space Saving 10-Pin MSOP Package Temperature Range: -40В°C to +85ВєC The TC654 and TC655 are PWM mode fan speed controllers with FanSense technology for use with brushless DC fans. These devices implement temperature
    proportional fan speed control which lowers acoustic
    fan noise and increases fan life. The voltage at VIN
    (Pin 1) represents temperature and is typically provided by an external thermistor or voltage output temperature sensor. The PWM output (VOUT) is adjusted
    between 30% and 100%, based on the voltage at VIN.
    The PWM duty cycle can also be programmed via
    SMBus to allow fan speed control without the need for
    an external thermistor. If VIN is not connected, the
    TC654/TC655 will start driving the fan at a default duty
    cycle of 39.33%. See Section 4.3 “Fan Start-up” for
    more details. Applications: Personal Computers and Servers
    LCD Projectors
    Datacom and Telecom Equipment
    Fan Trays
    File Servers
    General Purpose Fan Speed Control Package Type ...



Lifecycle StatusProduction (Appropriate for new designs but newer alternatives may exist)Production (Appropriate for new designs but newer alternatives may exist)




Auto shutdownNoNo
DescriptionProgrammable Dual Fan ManagerProgrammable Dual Fan Manager
External Temp InputYesYes
Fan Speed TableNoNo
FanSense fan monitorYesYes
High/Low PWM FreqLowLow
Integrated temp sensorNoNo
Max. Accuracy @ 25°, °Depends on external thermistorDepends on external thermistor
Max. Supply Current, µA320320
Operating Temperature Range, °C-40 to +85-40 to +85
Over temp alertNoNo
Predictive fan fault detection/read/RPMYesYes
SMBus compatible interfaceYesYes
Temp. Range, °-40 - +85-40 - +85
Typical Accuracy, °Depends on external thermistorDepends on external thermistor
Vcc Range, V+3.0 - +5.5+3.0 - +5.5

Eco Plan


Other Options


Moldel Line

Series: TC655 (2)

Manufacturer's Classification

  • Thermal Management > Fan Controllers > Open Loop Fan Controllers and Fault Detectors

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