资料介绍
Microchip's TC642, TC643, and TC646 are the world's first inte-
grated circuits dedicated for controlling and monitoring fan speed.
The new family of fan speed controllers modulate fan speed to
compensate for changes in system temperature. This means the
fan runs at full speed only when necessary, significantly extending
fan life. In addition to increased fan life, fan speed is controlled by
PWM control circuitry that is more efficient than conventional linear
techniques. The ICs provide other features such as fan current
limiting, minimum speed control, auto shutdown, and speed, fault,
and over-temperature indication. AN767
Interfacing Microchip's Fan Speed Controllers to a SPI Port
Author: Paul Paglia, STANDARD IMPLEMENTATION
Microchip Technology, Inc. The TC642, TC643, and TC646 use two different methodologies to
control fan speed. The TC642/646 provide a standalone solution
whereas the TC643 requires an external drive signal and RPM
INTRODUCTION s
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