MEC1322 datasheet(290/456 Pages) MICROCHIP

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MEC1322

DS00001719D-page 290

 2014 - 2015 Microchip Technology Inc.

26.0 RPM-PWM INTERFACE

26.1

Introduction

The RPM-PWM Interface is closed-loop RPM based Fan Control Algorithm that monitors the fan’s speed and automat-

ically adjusts the drive to maintain the desired fan speed.

The RPM-PWM Interface functionality consists of a closed-loop “set-and-forget” RPM based fan controller.

26.2

References

No references have been cited for this chapter

26.3

Terminology

There is no terminology defined for this chapter.

26.4

Interface

This block is designed to be accessed externally via the pin interface and internally via a registered host interface.

The registers in the block are accessed by embedded controller code at the addresses shown in Section 26.9, "Fan

Control Register Bank".

Figure 26-1 illustrates and categorizes the RPM-PWM Interface block signals. These signals are described in Table 26-

26.4.1

FAN CONTROL

The Fan Control Signal Description Table lists the signals that are routed to/from the block.

26.4.2

HOST INTERFACE

The registers defined for the RPM-PWM Interface are accessible by the various hosts as indicated in Section 26.9, "Fan

Control Register Bank".

FIGURE 26-1:

RPM-PWM INTERFACE I/O DIAGRAM

TABLE 26-1:

FAN CONTROL SIGNAL DESCRIPTION TABLE

Name

Direction

Description

TACH

Input

Tachometer input from fan

PWM

Output

PWM fan drive output

RPM-PWM Interface

Power, Clocks and Reset

Interrupts

Host Interface

Fan Control

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