TC664EUN

TC664/TC665 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 • 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 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 VIN 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). Applications • • • • • • • Personal Computers & Servers LCD Projectors Datacom & Telecom Equipment Fan Trays File Servers Workstations General Purpose Fan Speed Control 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 over-temperature condition. Package Type 10-Pin MSOP VIN 1 10 VDD CF 2 TC664 TC665 9 VOUT 8 SENSE SCLK 3 SDA 4 7 NC GND 5 6 FAULT  2002-2013 Microchip Technology Inc. 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) in the Status Register will also be set to a ‘1’. The TC664/TC665 devices are available in 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 is -40°C to +85ºC. DS21737B-page 1 TC664/TC665 Functional Block Diagram TC664/TC665 – VIN – VOTF + Note OTF VDD + + Control Logic VOUT Start-up Timer FAULT – CF VMIN Clock Generator Missing Pulse Detect  SCLK SDA 50 k SENSE – Serial Port Interface 100 mV (typ.) NC GND Note: OTF condition applies for the TC665 device only. DS21737B-page 2  2002-2013 Microchip Technology Inc. TC664/TC665 1.0 ELECTRICAL CHARACTERISTICS PIN FUNCTION TABLE Name Function Absolute Maximum Ratings * VIN Analog Input VDD..................................................................................6.5 V CF Analog Output Input Voltages .................................... -0.3 V to (VDD + 0.3 V) SCLK Serial Clock Input Output Voltages .................................. -0.3 V to (VDD + 0.3 V) SDA Serial Data In/Out (Open Drain) Storage temperature .....................................-65°C to +150°C GND Ground Ambient temp. with power applied ................-40°C to +125°C FAULT Digital (Open Drain) Output Maximum Junction Temperature, TJ ............................. 150°C NC No Connection 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. SENSE Analog Input VOUT Digital Output VDD Power Supply Input ELECTRICAL SPECIFICATIONS Electrical Characteristics: Unless otherwise noted, all limits are specified for VDD = 3.0 V to 5.5 V, -40°C 1600 Note 2 Shutdown Mode Supply Current Typ Max Units Conditions VOUT PWM Output PWM Frequency VIN Input VIN Input Resistance VIN Input Leakage Current VDD = 5.0 V SENSE Input SENSE Input Threshold Voltage with Respect to GND FAULT Output FAULT Output LOW Voltage FAULT Output Response Time IOL = 2.5 mA Fan RPM-to-Digital Output Fan RPM ERROR 2-Wire Serial Bus Interface Logic Input High VIH 2.1 — — V Logic Input Low VIL — — 0.8 V Logic Output Low VOL — — 0.4 V IOL = 3 mA Note 1 Input Capacitance SDA, SCLK I/O Leakage Current SDA Output Low Current CIN — 10 15 pF ILEAK -1.0 — +1.0 µA IOLSDA 6 — — mA VOL = 0.6 V Note 1: Not production tested, ensured by design, tested during characterization. 2: For 5.0 V < VDD  5.5 V, the limit for VIH = 2.2 V.  2002-2013 Microchip Technology Inc. DS21737B-page 3 TC664/TC665 TEMPERATURE SPECIFICATIONS Electrical Characteristics: Unless otherwise noted, all parameters apply at VDD = 3.0 V to 5.5 V Parameters Symbol Min Typ Max Units Conditions Temperature Ranges: Specified Temperature Range TA -40 — +85 °C Operating Temperature Range TA -40 — +125 °C Storage Temperature Range TA -65 — +150 °C JA — 113 — °C/W Thermal Package Resistances: Thermal Resistance, 10 Pin MSOP TIMING SPECIFICATIONS Electrical Characteristics: Unless otherwise noted, all limits are specified for VDD = 3.0 V to 5.5 V, -40°C