The TC652/653 are integrated temperature sensors and brushless DC fan speed controllers with FanSense™ technology. The TC652/653 measure their junction temperature and control the speed of the fan based on that temperature, making them especially suited for applications in modern electronic equipment. The FanSense™ fan fault detect circuitry eliminates the need for a more expensive 3 wire fan. Temperature data is converted from the on-chip thermal sensing element and translated into a fractional fan speed from 40% to 100%. A temperature selection guide in the data sheet is used to choose the low and high temperature limits to control the fan. The TC652/653 also include a single trip point over temperature alert (Tover) that eliminates the need for additional temperature sensors. In addition the TC653 includes an auto fan shutdown function for additional power savings. The TC652/653 are easy to use, require no software overhead, and are therefore the ideal choice for implementing thermal management in a variety of systems. FanSense™ is a trademark of Microchip Technology Inc.
Parameter Name Value
Typical Accuracy (°C) 1
Over Temp Alert yes
SM Bus NO
Predictive Fan Fault NO
Max. Supply Current (µA) 90
Max. Accuracy @ 25°C (°C) 3
Integrated Temp Sensor Yes
Fan Sense Yes
External Temp Input No
Auto Shutdown No
Device Description Fan Manager
Temp Range (°C) -40 to +125
Vcc Range (V) +2.8 to +5.5
Features
Digital Temperature Sensing
and Multi-Speed Fan Control
Built in Over Temperature Alert (Tover)
Temperature Proportional Fan Speed Control for Acoustic Noise Reduction
and Longer Fan Life
Pulse Width Modulation Output Drive for Cost and Power Savings
Solid State Temperature Sensing
±1o C (Typical) Accuracy from 25o C to +70o C
2.8 - 5.5V Operating Range
TC651 includes Auto Fan Shutdown
Low Operating Power: 50µA (Typ)
