14
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 graph below shows the typical factory set response to the DIM_INPUT voltage when in manual brightness control mode.
