7
User’s Manual / English
5.8 P15 (Floppy) Connector
Pin Description Color AWG
1
+5V Red
22
2 GND
Black 22
3 GND
Black 22
4 +12V1 Yellow
22
5.9 P16 (HCI) Connector
Pin Description Color AWG
1 +3.3V
Orange
24
2 Signal
+ Blue 24
3 Signal
- Purple
24
4 GND
Black 24
6. Automatic Fan Speed Control
Exact CFM requirements vary by application and end-use environment, but 60-70 CFM is typical
for the 120mm fan itself. For noise-sensitive applications, it is recommended that a thermally
sensitive fan speed control circuit be used to balance system-level thermal and acoustic
performance. This circuit typically senses the temperature of an internal heat sink and/or incoming
ambient air and adjusts the fan speed as necessary to keep power supply and system component
temperatures within specifications. Please refer to the fan speed control drawing below.
100%
90%
80%
70%
60%
50%
40%
30%
20%
10%
5
10
15
20
25
30
35
40
RPM
Load
dBA
600
1200
1800
2400
3000
Pin 1
Pin 1
