W83627THF_06 Datasheet, PDF (128/142 Pages) Winbond – Winbond LPC I/O

W83627THF/W83627THG
Difference between C and E version :
A. Pin Description
Fan speed control. Output analog voltage level to control the
SYSFANOUT 116 AOUT Fan's speed.
CPUFANOUT 115
AUXFANOUT 7 OUT12 Fan speed control. Use the Pulse Width Modulation (PWM) to
control the Fan’s RPM.
B. Fan Speed Control Registers
14.1 SYSFANOUT PWM Output Frequency Configuration Register - Index 00h
Register Location:
00h
Power on Default Value:
01h
Attribute:
Read/Write
Size:
8 bits
7 6 5 4 32 1 0
PWM_SCALE1
PWM_CLK_SEL1
The register is meaningful when SYSFANOUT be programmed as PWM output.
Bit 7: SYSFANOUT PWM Input Clock Source Select. This bit selects the clock source of PWM output f
requency.
Set to 0, select 24 MHz.
Set to 1, select 180 KHz.
Bit 6-0: SYSFANOUT PWM Pre-Scale divider. This is the divider of clock source of PWM output
frequency. The maximum divider is 128 (7Fh). This divider should not be set to 0.
01h : divider is 1
02h : divider is 2
03h : divider is 3
:
:
the formula is
PWM output frequency = ^{Input Clock} ∗ ¹
Pre_Scale Divider 256
- 121 -
Publication Release Date: September 26, 2006
Revision 1.2