IBM DDRS-39130 - Ultrastar 9.1 GB Hard Drive Specifications page 44

6.2.1.9 Disable SCSI Parity Check (Position 11)
Grounding this pin will disable SCSI Parity checking.
6.2.1.10 LED pins (Position 12)
The LED pins are used to drive an external Light Emitting Diode. Up to 30 mA of sink current capability
is provided. The LED Anode must be tied to the current limited + 5 V source provided on Pin #1 of the
Option Jumper Block. The LED Cathode is then connected to the Pin #2 to complete the circuit.
Figure 25. L E D Circuit
34
O E M Spec. of DDRS-3xxxx
+ 5 V
o
>
< 6 2 0 O h m
>
o P i n # 1 f o r L E D A n o d e
o P i n # 2 f o r L E D C a t h o d
/
\
/ / /