TC654EUNTR

TC654/TC655 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 Workstations General Purpose Fan Speed Control Package Type 10-Pin MSOP VIN 1 10 VDD CF 2 9 VOUT 8 SENSE1 TC654 TC655 SCLK 3 SDA 4 7 SENSE2 GND 5 6 FAULT  2002-2014 Microchip Technology Inc. In normal fan operation, pulse trains are present at SENSE1 (Pin 8) and SENSE2 (Pin 7). The TC654/ TC655 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 TC654/TC655 to assert a logic low alert signal (FAULT). The default threshold value is 500 RPM. Also, if this condition occurs, F1F (bit 0) or F2F (bit 1) in the Status Register will also be set to a ‘1’. An over-temperature condition is indicated when the voltage at VIN exceeds 2.6V (typical). The TC654/ TC655 devices indicate this by setting OTF(bit 5) in the Status Register to a '1'. The TC655 device also pulls the FAULT line low during an over-temperature condition. The TC654/TC655 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. DS20001734C-page 1 TC654/TC655 Functional Block Diagram TC654/TC655 – VIN – VOTF + Note OTF VDD + + Control Logic VOUT Start-up Timer FAULT – CF VMIN Clock Generator Missing Pulse Detect  SCLK SDA SENSE1 – Serial Port Interface 100 mV (typ.)  GND 50 k 50 k SENSE2 – 100 mV (typ.) Note: OTF condition applies for the TC655 device only. DS20001734C-page 2  2002-2014 Microchip Technology Inc. TC654/TC655 1.0 ELECTRICAL CHARACTERISTICS PIN FUNCTION TABLE Name Function Absolute Maximum Ratings * VIN Analog Input VDD...................................................................................6.5V CF Analog Output Input Voltages ...................................... -0.3V to (VDD + 0.3V) SCLK Serial Clock Input Output Voltages .................................... -0.3V to (VDD + 0.3V) 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 SENSE2 Analog Input 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. SENSE1 Analog Input VOUT Digital Output VDD Power Supply Input ELECTRICAL SPECIFICATIONS Electrical Characteristics: Unless otherwise noted, all limits are specified for VDD = 3.0V to 5.5V, -40°C 1600 Note 1: Not production tested, ensured by design, tested during characterization. 2: For 5.0V > VDD  5.5V, the limit for VIH = 2.2V.  2002-2014 Microchip Technology Inc. DS20001734C-page 3 TC654/TC655 ELECTRICAL SPECIFICATIONS (CONTINUED) Electrical Characteristics: Unless otherwise noted, all limits are specified for VDD = 3.0V to 5.5V, -40°C VDD  5.5V, the limit for VIH = 2.2V. 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 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 Conditions Temperature Ranges Thermal Package Resistances Thermal Resistance, 10 Pin MSOP TIMING SPECIFICATIONS Electrical Characteristics: Unless otherwise noted, all limits are specified for VDD = 3.0V to 5.5V, -40°C