2.7.3 Reference Schematics
Some displays feature an I
2
C interface for reading out the EDID PROM or additional controls such
as contrast and hue. If the carrier board provides no other display interface with DDC, the I2C2
interface should be used. If the DDC is used, make sure that I
2
C device(s) on the LVDS display does
not interfere with the DDC address 50h. Otherwise, a different I
2
C interface should be used. The
I
2
C interfaces on the Apalis module are 3.3V logic level. If the display requires a 5V interface, add
an I
2
C logic level shifter.
Figure 38: 24-bit Dual channel LVDS display reference schematic
2.7.4 Unused LVDS Interface Signal Termination
All unused LVDS interface signals can be left unconnected.
2.8 HDMI/DVI
The HDMI and DVI interface uses a TMDS compatible physical link to transfer video and optional
audio data. Electrically, HDMI and DVI are equal, but there can be some differences in the
protocol. HDMI is the successor of DVI and specifies the additional transport for audio data and
content protection (HDCP). HDMI devices (monitor, television set etc.) can be driven with the DVI
interface as HDMI is backward compatible. Compatibility is not guaranteed when attempting to
drive a DVI device with an HDMI interface. Not all DVI displays accept the HDMI protocol or are
HDCP compatible. Please read the datasheet of the Apalis module for more information about the
supported HDMI and DVI protocols.
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