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MEC1322 Datasheet(PDF) 290 Page - Microchip Technology

Part # MEC1322
Description  Keyboard and Embedded Controller for Notebook PC
PDF  456 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

MEC1322 Datasheet(HTML) 290 Page - Microchip Technology

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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-
1.
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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