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TC64X/TC64XB FAN CONTROL
DEMO BOARD USER’S GUIDE
2003 Microchip Technology Inc. DS21401C-page 1
Chapter 1. General Information
1.1 INTRODUCTION
Thank you for purchasing the TC64X/TC64XB Fan Control Demo Board from
Microchip Technology Inc. The TC64X/TC64XB Fan Control Demo Board allows the
user to quickly prototype fan control circuits based on Microchip’s pulse width
modulation (PWM) Fan Control integrated circuits.
These devices will be referred to as TC64X in this document:
•TC642
•TC646
•TC647
•TC648
•TC649
These devices will be referred to as TC64XB in this document:
•TC642B
•TC646B
•TC647B
•TC648B
•TC649B
A versatile sensor input and output driver circuitry allows the Fan Control Module to be
used with virtually any brushless DC fan and standard thermistor. An optional LED
status indicator gives a visual indication of a fan fault (stalled, open or unconnected fan)
or an overtemperature condition.
The TC64X/TC64XB Fan Control Demo Board has the following features:
1. Complete implementation of TC64X or TC64XB fan control circuitry on a
1.5" x 2.0" board
2. Works with standard thermistors
3. Temperature-proportional fan speed control
4. Overtemperature fault detection
5. Fan fault detection
6. Installs directly into user's end equipment
7. Speeds up prototyping, system development and system thermal
characterization
