4.3.3. Backlight power

Connector J5 can be used to supply power to an inverter for a cold-cathode LCD backlight. The backlight supply pins VIN on J5 are supplied for the unregulated, fused power supply input to the CP. The backlight inverter must consume less than 5W.

In addition to voltage and ground pins, the connector also supplies the brightness adjustment voltage (0 to 2.5V) and shutdown logic signal (generated from the on/off switch). The brightness is adjusted by a variable resistor, R26, located near J5.

Copyright © 2002 ARM Limited. All rights reserved.ARM DUI 0159B
Non-Confidential