|Category||Sensors => Temperature Sensors => Fan Controllers/Fan Fault Detectors|
|Title||Fan Controllers/Fan Fault Detectors|
|Description||The TC664 is a Single PWM Mode Fan Speed Controller With Fansense TM Technology For Use With Brush-less DC Motors|
|Company||Microchip Technology, Inc.|
|Datasheet||Download TC664 datasheet
Temperature Proportional Fan Speed for Reduced Acoustic Noise and Longer Fan Life FanSenseTM 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 SMBusTM-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: to +85ºCDescription
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. 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 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 `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<X>) in the Status Register a '1'. The TC665 device also pulls the FAULT line low during an over-temperature condition. The TC664/TC665 devices are available a 10-Pin MSOP package and consume 150 µA during operation. The devices can also enter a low-power shutdown mode (5 µA, typ.) by setting the appropriate bit in the Configuration Register. The operating temperature range for these devices to +85ºC.SMBusTM PWM Fan Speed Controllers With Fan Fault Detection
Personal Computers & Servers LCD Projectors Datacom & Telecom Equipment Fan Trays File Servers Workstations General Purpose Fan Speed Control
Name VIN CF SCLK SDA GND FAULT NC SENSE VOUT VDD Analog Input Analog Output Serial Clock Input Serial Data In/Out (Open Drain) Ground Digital (Open Drain) Output No Connection Analog Input Digital Output Power Supply Input Function
VDD..................................................................................6.5 V Input Voltages.................................... V to (VDD 0.3 V) Output Voltages................................. V to (VDD 0.3 V) Storage to +150°C Ambient temp. with power to +125°C Maximum Junction Temperature, TJ............................. 150°C ESD protection on all pins.................................................. 4 kV *Notice: Stresses above those listed under "Maximum ratings" may cause permanent damage to the device. This is a stress rating only and functional operation of the device at those or any other conditions above those indicated in the operational listings of this specification is not implied. Exposure to maximum rating conditions for extended periods may affect device reliability.
Electrical Characteristics: Unless otherwise noted, all limits are specified for VDD V, -40°C <TA < +85°C. Parameters Supply Voltage Operating Supply Current Shutdown Mode Supply Current VOUT PWM Output VOUT Rise Time VOUT Fall Time Sink Current at VOUT Output Source Current at VOUT Output PWM Frequency VIN Input VIN Input Voltage for 100% PWM duty-cycle VC(MAX) - VC(MIN) VIN Input Resistance VIN Input Leakage Current SENSE Input SENSE Input Threshold Voltage with Respect to GND FAULT Output FAULT Output LOW Voltage FAULT Output Response Time Fan RPM-to-Digital Output Fan RPM ERROR 2-Wire Serial Bus Interface Logic Input High Logic Input Low Logic Output Low Input Capacitance SDA, SCLK I/O Leakage Current SDA Output Low Current VIH VIL VOL CIN ILEAK IOLSDA µA mA VOL 0.6 V IOL 3 mA Note 1 Note RPM > 1600 VOL tFAULT 0.3 V sec IOL 2.5 mA VTHSENSE 120 mV IIN V C(MAX) VCRANGE V µA VDD tR tF IOL IOH F µsec mA Hz IOH = 5 mA, Note 1 IOL = 1 mA, Note 1 VOL 10% of VDD VOH 80% of VDD 1 µF Sym VDD IDD IDDSHDN Min 3.0 Typ 150 5 Max 300 10 Units V µA Pins 8, 9 Open Pins 8, 9 Open Conditions
Note 1: Not production tested, ensured by design, tested during characterization. 2: For 5.5 V, the limit for 2.2 V.
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