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F71872F Datasheet(PDF) 21 Page - Feature Integration Technology Inc.

Part # F71872F
Description  Super H/W Monitor LPC IO
PDF  115 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.

F71872F Datasheet(HTML) 21 Page - Feature Integration Technology Inc.

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July, 2007
V0.28P
19
F71872
FAN Out
+12V
GND
Pull-up resister
4.7K Ohms
+12V
Fan Input
FANIN 1
F71872
22K~30K
10K
FAN
Connector
FAN Out
+12V
GND
Pull-up resister < 1K
or totem-pole output
+12V
Fan Input
F71872
> 1K
Fan with Tach Pull-Up to +12V, or
Totem-Pole Putput and Zener Clamp
3.3V Zener
Fan with Tach Pull-Up to +12V, or Totern-Pole
Output and Register Attenuator
FANIN 1
FAN Out
+5V
GND
Pull-up resister
4.7K Ohms
+5V
Fan Input
FANIN1
F71872
1K~2.7K
10K
FAN
Connector
FAN Out
+5V
GND
Pull-up resister < 1K
or totem-pole output
+5V
Fan Input
FANIN1
F71872
> 1K
Fan with Tach Pull-Up to
+5V, or
Totem-Pole Putput and Zener
3.3V Zener
Fan with Tach Pull-Up to +5V, or Totern-Pole
Output and Register Attenuator
Determine the fan counter according to:
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 F71872 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:



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