Fan Speed Controller and Fan Fault Detector Family The TC642, TC646, TC647, TC648 and TC649 are fan speed controller products that support external temperature input. The TC642B, TC646B, TC647B, TC648B and TC649B are fan speed controller products that support external temperature input and incorporate a fan auto-restart function. The TC654, TC655, TC664 and TC665 are fan speed controller products that support external temperature input and two-wire serial communication. The TC64X, TC64XB, TC65X, and TC66X devices are pulse width modulation (PWM) fan speed controllers for DC brushless fans. These devices adjust the speed of the fan according to the temperature level, thereby reducing acoustic noise, minimizing power consumption, and extending fan life. A thermistor or other temperature dependent voltage output device can be used to supply the VIN voltage, which sets the required duty cycle drive signal on VOUT. The TC654/TC655 and TC664/ TC665 products allow the user to control fan speed and communicate data via a Standard Management Bus (SMBus) interface. These devices also enable the user to read fan RPM data and implement predictive fan failure detection. The entire family features a pulse width modulation (PWM) frequency of 30 Hz (CF = 1 µF) and an operating current of less than 0.5 mA. This family is fully specified from 3.0V to 5.5V over a -40°C to +85°C temperature range. Numerous features address a broad spectrum of applications, such as, shutdown mode for further power savings, FanSense™ technology for fan fault detection, auto-shutdown for automatic fan shut-off, minimum fan speed for constant cooling and over temperature alert for overheating detection. The TC64X and TC64XB devices are available in 8-pin PDIP, MSOP and SOIC packages. The TC65X and TC66X are available in a 10-pin MSOP package. These products are ideal for every application utilizing DC fans, especially where acoustic noise and fan reliability are critical. Suitable applications include computers, projectors, servers, datacom equipment, telecom equipment, power supplies, set-top boxes, fan racks and test equipment. Features: • Temperature proportional fan speed control • FanSense™ technology protects against fan and system failure • 3.0V to 5.5V supply voltage range • Low operating current • 30 Hz pulse width modulation (PWM) frequency (CF = 1 µF) • Support low cost NTC/PTC thermistors • Shutdown mode • Fan auto-restart (TC64XB devices only) • Read RPM data (TC654/TC655, TC664/TC665) • SMBus interface (TC654/TC655, TC664/TC665) • Temperature range: -40°C to +85°C • Available in PDIP, MSOP and SOIC packages Application Notes: • AN764 Implementing Temperature-based Variable Fan Speed Control in NLX Power Supplies • AN768 Redundant Fan Systems using the TC642 Fan Manager • AN770 Linear Voltage Fan Speed Control using Microchip’s TC64X family • AN771 Suppressing Acoustic Noise in Pulse Width Modulation Fan Speed Control Systems • AN772 Speed Error in Pulse Width Modulation Fan Control Systems Additional Information: • • • • • • • • • • • • • • • • Microchip’s web site: www.microchip.com Analog & Interface Families Data Book 2002, Order No. DS00207 Stand-Alone Analog and Interface Solutions Flyer, DS21060 Product Line Card, Order No. DS00148 TC642 Data Sheet, DS21444 TC646 Data Sheet, DS21446 TC647 Data Sheet, DS21447 TC648 Data Sheet, DS21448 TC649 Data Sheet, DS21449 TC642B Data Sheet, DS21756 TC646B Data Sheet, DS21755 TC647B Data Sheet, DS21756 TC648B Data Sheet, DS21755 TC649B Data Sheet, DS21755 TC654/TC655 Data Sheet, DS21374 TC664/TC665 Data Sheet, DS21737 Development Tools Support: TC642 Fan Control Demo Board User’s Guide (DS21401): This Fan Control circuit board allows the user to quickly evaluate and prototype Microchip’s TC64X and TC64XB pulse width modulation (PWM) Fan Control ICs. TC642 Fan Control Evaluation Board User’s Guide (DS21403): This fully assembled 4 inch by 6 inch circuit board allows the user to evaluate and prototype fan control circuits based on Microchip’s TC64X and TC64XB DC brushless fan controllers. Fan Speed Controller and Fan Fault Detector Specifications Temp # Min Fan Autoof Fans Speed Shutdown Monitored VCC Range Temperature Range Over-Temp Alert Typical IQ SMBus Interface TC642 +3.0V to +5.5V -40°C to +85°C X 500 µA — X TC646 +3.0V to +5.5V -40°C to +85°C X 500 µA — TC647 +3.0V to +5.5V -40°C to +85°C — 500 µA — TC648 +3.0V to +5.5V -40°C to +85°C X 500 µA TC649 +3.0V to +5.5V -40°C to +85°C — 500 µA TC642B +3.0V to +5.5V -40°C to +85°C X TC646B +3.0V to +5.5V -40°C to +85°C TC647B +3.0V to +5.5V -40°C to +85°C TC648B +3.0V to +5.5V -40°C to +85°C TC649B +3.0V to +5.5V TC654 +3.0V to +5.5V Product 1 RPM Data Predictive Fan Fault Detection Fan AutoRestart # of Pins/ Package — 1 — — — 8P, 8SN, 8MS — X 1 — — — 8P, 8SN, 8MS X — 1 — — — 8P, 8SN, 8MS — — X 0 — — — 8P, 8SN, 8MS — — X 1 — — — 8P, 8SN, 8MS 200 µA — X — 1 — — X 8P, 8SN, 8MS X 200 µA — — X 1 — — X 8P, 8SN, 8MS — 200 µA — X — 1 — — X 8P, 8SN, 8MS X 200 µA — — X 0 — — X 8P, 8SN, 8MS -40°C to +85°C — 200 µA — — X 1 — — X 8P, 8SN, 8MS -40°C to +85°C — 150 µA X X — 2 X X — 10UN TC655 +3.0V to +5.5V -40°C to +85°C X 150 µA X X — 2 X X — 10UN TC664 +3.0V to +5.5V -40°C to +85°C — 150 µA X X — 1 X X — 10UN TC665 +3.0V to +5.5V -40°C to +85°C X 150 µA X X — 1 X X — 10UN Note 1. These devices use an external sensor. Accuracy of the total solution is a function of the accuracy of the external sensor. Package Key: P = PDIP SN = SOIC MS = MSOP UN = MSOP Microchip Technology Inc. • 2355 W. Chandler Blvd. • Chandler, AZ 85224-6199 • (480) 792-7200 • Fax (480) 792-9210 Visit our web site at www.microchip.com for additional product information and your local sales office. Information subject to change. The Microchip name and logo are registered trademarks of Microchip Technology Inc. in the U.S.A. and other countries. FanSense is a trademark of Microchip Technology Inc. in the U.S.A. and other countries. All other trademarks mentioned herein are property of their respective companies. © 2003 Microchip Technology Inc. All rights reserved. DS21604C 5/2003