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W83637HF_06 Datasheet, PDF (36/151 Pages) Winbond – LPC I/O | |||
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W83637HF/HG
6.4.2 Fan speed control
The W83637HF provides maximum 3 sets for fan PWM speed control. The duty cycle of PWM can be
programmed by a 8-bit registers which are defined in the Bank0 Index 01h, Index 03h and Index 11h.
The default duty cycle is set to 100%, that is, the default 8-bit registers is set to FFh. The expression of
duty can be represented as follows.
Duty â cycle(%) = Programmed 8 - bit Register Value à 100%
255
The PWM clock frequency also can be program and defined in the Bank0 Index 00h, Index 02h and
Index 10h. The application circuit is shown as follows.
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Figure 6.5
- 31 -
Publication Release Date: March, 2006
Revision 1.6
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