Product manual

Barracuda 9FC Product Manual, Rev. C 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 possible

among the pins. The maximum current typically occurs while the drive motor is starting.

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

150

Differential

Transfer Medium

.001µf

Transmitter

Receiver