Manual brightness control – Planar LC1502R User Manual
Page 17
LC1502R User’s Guide
(020-0315-02B)
17
Manual Brightness Control
In manual brightness control mode, an externally supplied voltage determines the monitor brightness.
To use manual brightness control mode instead of the default automatic brightness control mode:
1. set pin 4 (/EXT_DIM) of the external dimming connector (J1) to a logic low
2. apply a 0 to 5V analog input to pin 3 (DIM_INPUT) of the external dimming connector
A potentiometer may be used to apply the voltage to the DIM_INPUT, as shown in the figure below.
A 20k pot or higher is recommended. Note that VREF is a 5V regulated voltage supplied through a
470 ohm series resistance.
Important note! Do not connect to pin 2!
Manual brightness control using a potentiometer
The schematic below is a reference design for the user to install the photo sensor remotely from
the display.
Reference Design for Remote Photo Diode Brightness Control
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