Electrical Description; Pin Descriptions - Seagate Cheetah 15K Product Manual

12.4.4

Electrical description

SAS drives use the device connector for:
• DC power
• SAS interface
• Activity LED
This connector is designed to either plug directly into a backpanel or accept cables.
12.4.5

Pin descriptions

This section provides a pin-out of the SAS device and a description of the functions provided by the pins.
Table 23: SAS pin descriptions
Pin Signal name
S1 Port A Ground
S2* +Port A_in
S3* -Port A_in
S4 Port A Ground
S5* -Port A_out
S6* +Port A_out
S7 Port A Ground
S8 Port B Ground
S9* +Port B_in
S10* -Port B_in
S11 Port A Ground
S12* -Port B_out
S13* +Port B_out
S14 Port B Ground
* - Short pin to support hot plugging
NC - No connection in the drive.
Cheetah 15K.7 SAS Product Manual, Rev. C
Signal type
Diff. input pair
Diff output pair
Diff. input pair
Diff output pair
Pin Signal name
P1* NC (reserved 3.3Volts)
P2* NC (reserved 3.3Volts)
P3 NC (reserved 3.3Volts)
P4 Ground
P5 Ground
P6 Ground
P7 5 Volts charge
P8* 5 Volts
P9* 5 Volts
P10 Ground
P11* Ready LED
P12 Ground
P13 12 Volts charge
P14* 12 Volts
P15* 12 Volts
Signal type
Open collector out
61