Technical Reference Guide
www.hp.com
7-9
Power and Signal Distribution
Figure 7-3 shows the power supply cabling for the SFF/ST systems.
Connectors not shown to scale.
All + and - values are VDC.
RTN = Return (signal ground)
sns = sense
GND = Power ground
RS = Remote sense
FC = Fan command
FO = Fan off
FSpd = Fan speed
FS = Fan Sink
POK = Power OK (power good)
VccP = +12 for CPU
[1] This row represents pins 13–24 of connector P1
Figure 7-3. SFF/ST Power Cable Diagram
Conn
Pin 1
Pin 2
Pin 3
Pin 4
Pin 5
Pin 6
Pin 7
Pin 8
Pin 9
Pin
10
Pin
11
Pin
12
P1
+5
aux
RTN
+ 5
+5
PS On
RTN
Pwr Gd
+3.3
+3.3
Tach
RTN
Fan
P1 [1]
+12
+5 sns
RTN
+5
+5
+3.3
RTN
+3.3 sns
+3.3
+3.3
RTN
-12
P2
+5
RTN
RTN
+12
P3
RTN
RTN
RTN
VccP
VccP
+12
P4, 5,
7
+3.3
RTN
+5
RTN
+12
Power Supply
403778
P1
P3
P2
P4
P5
P7
P1
13
1
12
P4, P5, P7
24
1
2
3
4
5
1
2
3
4
P2
P3
1
3
4
6
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