HDMI2C2-14HD Datasheet, PDF (8/31 Pages) STMicroelectronics – ESD protection and signal booster for HDMI™ 1.4 sink interface

Application information
HDMI2C2-14HD
Figure 6. Benefit of the dynamic pull-up on the DDC bus
I2C driver without dynamic pull-up
I2C driver with dynamic pull-up
5V_IN
5V_IN
R _{PU_BUS}
R _{PU_BUS}
750pF
750pF
IC control
VDD_IC
HDMI™ cable model
IC control
VDD_IC
HDMI™ cable model
Signal on the cable
5V_IN
Signal on the cable
5V_IN
Rise time out of I2C specification
Risk of communication failure
Rise time compliant with I2C specification
Signal integrity even on 750pF load capacitance
In order to activate the DDC bus, both following conditions must be respected: the V_{DD_5V}
must be higher than the V_{DD_ON} threshold (see Table 3) and all inputs and outputs of the
bidirectional level shifters (SCL, SDA, SCL_IC, SDA_IC) must be set to a high level at the
same time.
The DDC outputs (SCL and SDA on cable side) integrate a protection against ESD which is
compliant with IEC61000-4-2 standard, level 4 (8kV contact).
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