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TC655 Datasheet(PDF) 1 Page - Microchip Technology |
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TC655 Datasheet(HTML) 1 Page - Microchip Technology |
1 / 36 page 2002 Microchip Technology Inc. DS21734A-page 1 M TC654/TC655 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 (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 Applications • Personal Computers & Servers • LCD Projectors • Datacom & Telecom Equipment • Fan Trays • File Servers • Workstations • General Purpose Fan Speed Control Package Type Description The TC654 and TC655 are PWM mode fan speed con- trollers with FanSense technology for use with brush- less 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 pro- vided by an external thermistor or voltage output tem- perature 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 Startup", for more details. 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 revolu- tions 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<0>) or F2F (bit 1<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 TC654/ TC655 devices indicate this by setting OTF(bit 5<X>) 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 opera- tion. 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. 10-Pin MSOP 1 2 3 4 5 10 9 8 7 6 VIN CF SCLK SDA GND VDD VOUT SENSE1 SENSE2 FAULT TC654 TC655 Dual SMBus™ PWM Fan Speed Controllers With Fan Fault Detection SMBus is a trademark of Intel Corporation. |
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