HDMI2C1-6C1 Datasheet, PDF (8/23 Pages) STMicroelectronics – ESD protection and signal booster for HDMI source control stage interface

Application information
HDMI2C1-6C1
2.3
HEAC link and HPD line description
The HDMI2C1-6C1 proposes a unique solution in order to manage and protect both the
HEAC and the HPD links. The Figure 7 shows an overview of the function diagram of the
integrated block.
VDD_IC
Figure 7. HEAC / HPD / Utility functional block diagram
VDD_IC
HDMI
connector
HDMI
ASIC
or
IC
HPD_IC
HEAC -
HEAC+
matching
HPD
HPD / HEAC- 1
2
3
4
5
6
7
8
9
10
11
Utility
12
13
14
15
17
16
Utility / HEAC+
19
18
2.3.1
This block simplifies the design and the PCB layout of the HPD and HEAC functions. Simply
connect the 2 pins from the HDMI connector to one side of the device, and then use the 3
dedicated outputs on the other side of the device to manage separately the HPD and the
HEAC links.
Both HPD and Utility inputs (cable side) integrate a protection against ESD which is
compliant with IEC61000-4-2 standard, level 4 (8 kV contact).
HPD line description
The HPD line is described in the HDMI standard as the hot plug detect function. This line is
used by the source device in order to detect if a sink device is connected through an HDMI
cable.
The integrated HPD block is pulling down the line via a current source. When the input
voltage is detected to be higher than a threshold level, the signal is converted into a high
state level on the ASIC side, at the voltage level of the ASIC power supply V_{DD_IC}.
Otherwise, CEC_IC pin remains in low state.
The electrical parameters relevant to the HPD block and specified by theTable 7 are
illustrated in the Figure 8.
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