The HDMI and DVI interfaces define different connectors. There are passive adapters available in
both directions. Please be aware that HDMI and HDCP have licensing restrictions in place.
2.8.1 HDMI/DVI Signals
Table 17: HDMI/DVI signals
2.8.2 Reference Schematics
2.8.2.1 DVI Schematic Example
There are different DVI connector configurations available. The DVI-D (digital) supports only the
native DVI signals. The DVI-A (analogue) provides only analogue VGA signals. The DVI-I
(integrated) combines the digital DVI signals and the analogue VGA signals. For the DVI-A and
DVI-I, there are passive adapters to the D-SUB VGA connector available. There is only one DDC
channel available on the DVI-I interface. Therefore, the connector is not designed to use both links
(DVI and VGA) simultaneously. Nevertheless, there are Y-cables available which provide a DVI and
VGA output. Such cables are not standardized. They provide the DDC on either the DVI or VGA
output. Please be aware of this when using a similar Y-cable.
The following schematic example shows a DVI-I implementation. It can be used as an example for
a DVI-D design if you simply remove the analogue VGA signals. The sync signals for the VGA
signals need to be level shifted from 3.3V to 5V. The same is necessary for the DDC signals. The
TDMS signals need to be ESD protected using diodes. The schematic example shows a discrete
solution for the level shifting and protection. There are integrated solutions also available.
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