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ManualsBrandsSeagate ManualsSwitchCHEETAH ST34501FC
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Cheetah 4LP FC Product Manual, Rev. A 43
9.5.4 Pin descriptions
This section provides a pin-out of the FC-SCA and a description of the functions provided by the pins.
Table 15: FC-SCA pin descriptions
*Short pins in mating backpanel connector.
9.5.5 FC-AL transmitters and receivers
A typical FC-AL differential copper transmitter and receiver pair is shown in Figure 14. The receiver is required
to provide the AC coupling to eliminate ground shift noise.
Figure 14. FC-AL transmitters and receivers
9.5.6 Power
Power is supplied through the FC-SCA with support for +5 volts and +12 volts. All of the voltage pins in the
drive connector are the same length.
Four 12 volt pins provide +12 volt power to the drive. The current return for the +12 volt power supply is
through the common ground pins. The supply current and return current must be distributed as evenly as pos-
sible among the pins. The maximum current typically occurs while the drive motor is starting.
Three 5 volt pins provide logic power to the drive. The current return for the +5 volt power supply is through the
common ground pins. The supply and return current must be distributed as evenly as possible among the volt-
age and ground pins.
Pin Signal name Signal type Pin Signal name Signal type
1* -EN bypass port A TTL output 21 12 Volts charge
2* 12 Volts 22 Ground
3* 12 Volts 23 Ground
4* 12 Volts 24* +Port A_in Diff. PECL input pair
5* -Parallel ESI TTL output 25* -Port A_in
6* Ground (-DRV present) 26 Ground
7* Active LED out Open collector out 27* +Port B_in Diff. PECL input pair
8* Reserved 28* -Port B_in
9* Start_1 TTL input 29 Ground
10* Start_2 TTL input 30* +Port A_out Diff PECL output pair
11* -EN bypass port B TTL output 31* -Port A_out
12* SEL_6 TTL input 32 Ground
13* SEL_5 TTL input 33* +Port B_out Diff PECL output pair
14* SEL_4 TTL input 34* -Port B_out
15* SEL_3 TTL input 35 Ground
16* Fault LED out Open collector out 36 SEL_2 TTL input
17* Reserved NC 37 SEL_1 TTL input
18* Reserved NC 38 SEL_0 TTL input
19* 5 Volts 39 Reserved NC
20* 5 Volts 40 5 Volts charge