M
TC64X/TC64XB FAN CONTROL
EVALUATION BOARD USER’S GUIDE
2003 Microchip Technology Inc. DS21403C-page 1
Chapter 1. General Information
1.1 INTRODUCTION
Thank you for purchasing the TC64X/TC64XB Fan Control Evaluation Board from
Microchip Technology Inc. The TC64X/TC64XB Fan Control Evaluation Board allows
the user to evaluate and prototype brushless DC fan control circuits using one of the
following Microchip BDC fan controllers.
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
The fan speed control signal can be provided by an external sensor or voltage signal,
or from the on-board control voltage potentiometer.
Minimum speed setting devices are:
•TC642/2B
•TC647/7B
Auto-shutdown threshold devices are:
•TC646/6B
•TC648/8B
•TC649/9B
The minimum speed setting and auto-shutdown threshold devices are conveniently set
by an on-board potentiometer.
The TC64X/TC64XB Fan Control Evaluation Board has the following features:
1. Capacity for complete evaluation and prototyping for TC64X and TC64XB BDC
fan controllers.
2. Works with any BDC fan.
3. User prototyping area is provided for dedicated circuity and other user-specific
circuits.
4. Jumper blocks allow users to quickly configure output stage and input signal
source.
5. External or internal control voltage.
6. Convenient user test points provide easy access for instrument readings at
critical nodes.
