TC642 Datasheet
http://www.microchip.com/stellent/images/mchpsiteimages/dwnfolder.gifTC642 DatasheetThe TC642 is a switch mode fan speed controller for use with brushless DC motors. Temperature proportional speed control is accomplished using pulse width modulation. A thermistor (or other voltage output temperature sensor) connected to the VIN input furnishes the required control voltage of 1.25Vto 2.65V (typical) for 0% to 100% PWM duty cycle. Minimum fan speed is set by a simple resistor divider on the VMIN input. An integrated Start-Up Timer ensures reliable motor start-up at turn-on, coming out of Shutdown Mode, or following a transient fault. A logic low applied to VMIN, pin 3, causes fan shutdown. The TC642 also features Microchip Technology's proprietary FanSense™ technology for increasing system reliability. In normal fan operation, a pulse train is present at SENSE, pin 5, indicating normal operation. A missing-pulse detector monitors this pin during normal fan operation. A stalled, open, or unconnected fan causes the TC642 to trigger its start-up timer once. If the fault persists, the FAULT output goes low, and the device is latched in its Shutdown Mode. FAULT is also asserted if the PWM reaches 100%
Parameter NameValue
Typical Accuracy (°C)Depends on external thermistor
Over Temp Alertyes
SM BusNO
Predictive Fan FaultNO
Max. Supply Current (µA)1000
Max. Accuracy @ 25°C (°C)Depends on external thermistor
Integrated Temp SensorNo
Fan SenseYes
External Temp InputYes
Auto ShutdownNo
Device DescriptionFan Manager
Temp Range (°C)-40 to +85
Vcc Range (V)+3.0 to +5.5
Features
Temperature Proportional
Fan Speed for Acoustic Control and Longer Fan Life
Efficient PWM Fan Drive
3.0V 5.5V Supply Range Fan Voltage Independent of TC642 Supply Voltage - Supports Any Fan Voltage!
FanSense™ Fault Detection Circuits Protect Against Fan Failure and Aid
System Testing
Shutdown Mode for "Green" Systems
Supports Low Cost NTC/PTC Thermistors
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