Microchip MEC1418 Bedienungsanleitung

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 2017 Microchip Technology Inc.DS00002137B-page 1

INTRODUCTION

Pulse Width Modulation (PWM) modules, which produce basically digital waveforms, can be used in many applications

as a more efficient and lower power alternative to the traditional 8 bit Digital-to-Analog (D/A) converters using only two

inexpensive filter components. A wide variety of microcontroller applications that exist today are better served by utiliz-

ing a PWM generated analog output as opposed to an 8 bit D/A converter. One application where using a high resolution

PWM has value vs. a traditional 8 Bit DAC is in driving the 3-wire voltage controlled fan in a PC.

Audience

This document is written for a reader that is familiar with hardware design. The goal of this application note is to provide

information regarding how to use a PWM to drive 3-wire fans that provides system benefits and an enhanced customer

experience.

References

The following documents should be referenced when using this application note. Please contact your Microchip repre-

sentative for availability.

•Microchip MEC140x/MEC141x/MEC142x Data Sheet

•Microchip MEC140x/MEC141x/MEC142x EVBs

AN2137

PWM Controlled Fan for MEC140x/MEC141x/MEC142x

Author:Tom Tse / Greg VanWesten



Microchip Technology Inc.

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