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CHEETAH 15K.7 FC PRODUCT MANUAL, REV. E 58
11.5.4 Pin descriptions
This section provides a pin-out of the FC-SCA and a description of the functions provided by the pins.
Table 24 FC-SCA pin descriptions
PI
N
SIGNAL NAME SIGNAL TYPE PIN SIGNAL NAME SIGNAL TYPE
1* -EN bypass port A Low Voltage TTL out-
put
21 12 Volts charge
2* 12 Volts 22 Ground
3* 12 Volts 23 Ground
4* 12 Volts 24* +Port A_in FC Diff. input pair
5* -Parallel ESI 25* -Port A_in
6* Ground
[1]
26 Ground
7* Active LED out Open collector out 27* +Port B_in FC Diff. input pair
8* Reserved 28* -Port B_in
9* Start_1
[2]
TTL input 29 Ground
10
*
Start_2
[2]
TTL input 30* +Port A_out FC Diff. output pair
11
*
-EN bypass port B Low Voltage TTL out-
put
31* -Port A_out
12
*
SEL_6 TTL input/output 32 Ground
13
*
SEL_5 TTL input/output 33* +Port B_out FC Diff. output pair
14
*
SEL_4 TTL input 34* -Port B_out
15
*
SEL_3 TTL input/output 35 Ground
16
*
Fault LED out Open collector out 36 SEL_2 TTL input/output
17
*
DEV_CTRL_CODE_2
[
2
]
TTL input 37 SEL_1 TTL input/output
18
*
DEV_CTRL_CODE_1
[
2]
TTL input 38 SEL_0 TTL input/output
19
*
5 Volts 39 DEV_CTRL_CODE_0
[
2
TTL input
20
*
5 Volts 40 5 Volts charge
*Short pins in mating backpanel connector.
[1] This pin may be connected to external logic to detect the presence of the drive. The drive connects this pin to the com-
mon ground.
[2] Pins 9, 10, 17, 18, and 39 are option select pins and are tied high by the drive circuitry. The preferred electrical connec-
tion at the backplane is either open or grounded (open for the ‘1’ setting, grounded for the ‘0’ setting). Alternatively,
these pins may be driven by a 3.3V logic device, pulled up to 3.3V through a pull-up resistor (recommended size of 10k
ohm), or grounded through some other means.