Figure 12: DVI-I Reference Schematic
2.5.2.2 HDMI Schematic Example
The HDMI connector does not feature an Analog VGA interface, but an optional Consumer
Electronics Control (CEC) interface is available on the connector. The location of the CEC signal is
not standardized on the Colibri modules. Check the datasheet of the modules for more
information on the position of the signal. The CEC is a single-wire interface used to control
consumer audio and video devices such as television sets or AV receivers. There are many different
CEC trade names (VIERA Link, Anynet+, EasyLink, Aquos Link, BRAVIA Link, and others.). The CEC
is a 3.3V interface. Nevertheless, it is recommended to add a level shifter from the internal 3.3V
logic level. This eliminates problems with displays that pull-up the signal to other voltage levels.
The I
2
C signals for the DDC and the hotplug detection (HPD) need to be shifted to/from the 5V
logic level of the HDMI to the Colibri level of 3.3V. The HPD has a 100kΩ pull-down resistor
already on the baseboard
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