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Appendix C:
KE-USB108 Status LED Signals
Anode/Cathode Graphic
USB Connector
Scroll Caps Num
Inner Pin
LED Circuit for use with the KE-USB108
KE-USB108 LED Signal on pin closest to outside edge of board (Scroll, Caps, or Num)
Keyboard status light drive is available with the KE-USB108. The
unit provides a pair of connection points for each of the Num
Lock, Caps Lock, and Scroll Lock status LEDs.
The KE-USB108 features a 2 x 3 header for driving the three
status LEDs for Num, Caps, and Scroll Lock. Connect the LEDs
by attaching the anode leg to the inner pin of the signal pair and
attaching the cathode leg of the LED to outer pin on the signal
pair. The outer pin is the pin closest to the outside edge of the
KE-USB108. No external current limiting resistors are required as
they are supplied on the board.
NOTE: Do not supply power to the LED interface connector.
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