User`s manual

DIGITAL-LOGIC AG MSMVGA Manual V1.0
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7SPECIAL PERIPHERALS,CONFIGURATION,FUNCTIONS
7.1 Onboard BIAS Power generation (only on the MSMV104L)
On the MSMV104L (low cost) board is no BIAS generator implemented.
IMPORTANT:
The onboard voltage generation must be adjusted and measured before the
LCD panel is connected, otherwise the display may be destroyed.
Follow these steps:
7.1.1 VEE Generation
If there is an external 12V power supply at the PC/104 BUS PIN B9, switch the Jumpers J25 and J26
to 2-3. With 12V at the VEE generator the stability of the VEE range is improved. VEE Range -35V to
+35V.
7.1.2 Selection of the polarity VEE
Some displays use positive, other use negative BIAS voltages. Refer to the datasheet of the flatpanel
in order to find out the correct polarity. With the polarity jumper J6 (see Jumper) the definition is
made.
7.1.3 Adjustment of the voltage
The voltage may be varied between 35V and 15V with the selected polarity.
The current depends on the input voltage and the load. Check the following diagrams:
7.1.3.1 Positive voltage with 5V input