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Datasheet Microchip TC654EUNTR

Part NumberTC654EUNTR

The TC654 is a dual PWM mode fan speed controller with FanSense TM technology for use with brush-less DC motors


  • Download » Datasheet, PDF, 585 Kb, 08-07-2014
    TC654/TC655 Data Sheet
    Docket ↓
    Dual SMBus™ PWM Fan Speed Controllers With
    Fan Fault Detection
    Features: Description: Temperature Proportional Fan Speed for Reduced
    Acoustic Noise and Longer Fan Life FanSense™ Protects against Fan Failure and
    Eliminates the Need for 3-wire Fans Overtemperature Detection (TC655) Efficient PWM Fan Drive Provides RPM Data 2-Wire SMBus™-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: -40°C to +85ºC 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)




Auto shutdownNo
DescriptionProgrammable Dual Fan Manager
External Temp InputYes
Fan Speed TableNo
FanSense fan monitorYes
High/Low PWM FreqLow
Integrated temp sensorNo
Max. Accuracy @ 25°Depends on external thermistor °
Max. Supply Current320 µA
Operating Temperature Range-40 to +85 °C
Over temp alertNo
Predictive fan fault detection/read/RPMYes
SMBus compatible interfaceYes
Temp. Range-40 - +85 °
Typical AccuracyDepends on external thermistor °
Vcc Range+3.0 - +5.5 V

Eco Plan


Other Options


Moldel Line

Series: TC654 (2)

Manufacturer's Classification

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