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TC664

Microchip Technology
Part Number TC664
Manufacturer Microchip Technology
Description (TC664 / TC665) PWM Fan Speed Controllers
Published Feb 2, 2010
Detailed Description M Features • Temperature Proportional Fan Speed for Reduced Acoustic Noise and Longer Fan Life • FanSense™ Protects agai...
Datasheet PDF File TC664 PDF File

TC664
TC664

Overview
M Features • 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 • Over Temperature Detection (TC665) • 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 TC664/TC665 Description The TC664/TC665 devices 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 V IN is not connected, the TC664/TC665 will start driving the fan at a default duty cycle of 39.
33%.
See Section 4.
3, "Fan Startup", for more details).
In normal fan operation, a pulse train is present at the SENSE pin (Pin 8).
The TC664/TC665 use these pulses to calculate the fan revolutions per minute (RPM).
The fan RPM data is used to detect a worn out, stalled, open or unconnected fan.
An RPM level below the user-programmable threshold causes the TC664/ TC665 to assert a logic low alert signal (FAULT).
The default threshold value is 500 RPM.
Also, if this condition occurs, FF (bit 0<0>) in the Status Register will also be set to a ‘1’.
An over-temperature condition is indicated when the voltage at VIN exceeds 2.
6 V (typical).
The TC664/ TC665 devices indicate this by setting OTF(bit 5) in the Status Register to a '1'.
The TC665 device also pulls the FAULT line low during an ...


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