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F71806 Datasheet(PDF) 21 Page - Feature Integration Technology Inc.

Part # F71806
Description  Super H/W Monitor LPC IO
PDF  109 Pages
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Manufacturer  FINTEK [Feature Integration Technology Inc.]
Direct Link  http://www.fintek.com.tw/eng
Logo FINTEK - Feature Integration Technology Inc.

F71806 Datasheet(HTML) 21 Page - Feature Integration Technology Inc.

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July, 2007
V0.26P
19
F71806
RPM
Count
6
10
5
.
1
×
=
In other words, the fan speed counter has been read from register, the fan speed can be evaluated by the
following equation. As for fan, it would be best to use 2 pulses tachmeter output per round.
Count
RPM
6
10
5
.
1
×
=
6.4.4
Fan speed control
The F71806 provides 2 fan speed control methods: 1. Linear FAN Control 2. PWM Duty Cycle
Linear Fan Control
The range of DC output is 0~3.3V, controlled by 8-bit register (CR6Bh for FAN1, CR7Bh for FAN2 and
CR8Bh for FAN3). 1 LSB is about 0.013V. The output DC voltage is amplified by external OP circuit, thus to
reach maximum FAN OPERATION VOLTAGE, 12V.
The output voltage will be given as followed:
255
Value
Register
bit
-
8
Programmed
3
.
3
(V)
tage
Output_vol
×
=
And the suggested application circuit for linear fac control would be:
DC OUTPUT VOLTAGE
R
3.9K
R10K
12V
PMOS
R27K
1
2
3
JP1
CON3
R
10K
D1
1N4148
R
4.7K
C
47u
FANIN MONITOR
C
0.1u
3
2
1
+
-
LM358
DC FAN Control with OP
PWM duty Fan Control
The duty cycle of PWM can be programmed by a 8-bit register which are defined in the CR6Bh, CR7Bh and
CR8Bh. 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.



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