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F71883 Datasheet(PDF) 45 Page - Feature Integration Technology Inc.

Part # F71883
Description  Super Hardware Monitor LPC I/O
PDF  133 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.

F71883 Datasheet(HTML) 45 Page - Feature Integration Technology Inc.

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May, 2008
V0.27P
-39-
F71883
Fig 7-4
Fan speed count
Inputs are provided by the signals from fans equipped with tachometer outputs. The
level of these signals should be set to TTL level, and maximum input voltage cannot be over
5V. If the input signals from the tachometer outputs are over the 5V, the external trimming
circuit should be added to reduce the voltage to obtain the input specification. The normal
circuit and trimming circuits are shown as follows:
FAN Out
+12V
GND
Pull-up resister
4.7K Ohms
+12V
Fan Input
FANIN 1
F71883
22K~30K
10K
FAN
Connector
FAN Out
+12V
GND
Pull-up resister < 1K
or totem-pole output
+12V
Fan Input
F71883
> 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
Fig 7-5 / 7-6
FAN Out
+5V
GND
Pull-up resister
4.7K Ohms
+5V
Fan Input
FANIN1
F71883
1K~2.7K
10K
FAN
Connector
FAN Out
+5V
GND
Pull-up resister < 1K
or totem-pole output
+5V
Fan Input
FANIN1
F71883
> 1K
Fan with Tach Pull-Up to +5V, or
Totem-Pole Putput and Zener Clamp
3.3V Zener
Fan with Tach Pull-Up to +5V, or Totern-Pole
Output and Register Attenuator
Fig 7-7 / 7-8
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 tachometer
output per round.



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