HDMI2C1-14HD datasheet(13/32 Pages) STMICROELECTRONICS

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DocID023674 Rev 2

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HDMI2C1-14HD

Application information

Figure 12. TMDS lines ESD protection functional diagram

2.7

Application block diagrams

The Figure 13 shows an application block diagram proposal, implementing all the possible

options. The TMDS channels are simply connected to the connector and to the source

HDMI ASIC. The diagram shows that the CEC driver can be totally independent from the

HDMI ASIC. By this way, even if the +5 V power supply and/or if the HDMI ASIC is sleeping

in stand-by mode, the CEC bus is still active in low power mode. The designer has then all

the tools to optimize the power consumption of the global application in stand-by mode, and

has the possibility to implement a smart wake-up through the CEC bus enhancing the final

user experience.

Figure 13. Application block diagram

DAT_D2+

DAT_D2 -

DAT_D1+

DAT_D1-

DAT_D0+

DAT_D0 -

DAT_CLK

5V_OUT

DAT_CLK+

ESD_DSICH

HDMI

ASIC

DAT_D2+_IC

DAT_D2 -_IC

DAT_D1+_IC

DAT_D1-_IC

DAT_D0+_IC

DAT_D0 -_IC

DAT_CLK- _IC

DAT_CLK+_IC

HDMI

connector

VDD_IC

CEC

driver

+5V

SCL_IC

SDA_IC

SDA

SCL

CEC bus

VDD_CEC_IC

VDD_IC

VDD_CEC

VDD_5V

VDD_IC

FAULT

HPD_IC

VDD_CEC_IC

CEC_IC

5V_OUT

HPD

SDA

SCL

CEC

VDD_CEC

Utility

ESD_DISCH

VDD_IC

4 TMDS channels

8 lines

HPD

DDC data

HPD / HEAC-

Utility / HEAC+

HEAC-

HEAC+

over current

detect

TMDS

lines IN

TMDS

lines OUT

HEAC -

HEAC+

HDMI2C1-14HD

TMDS data 2+

TMDS data 2

TMDS data 1+

TMDS data 1

TMDS data 0+

TMDS data 0

TMDS Clock+

TMDS Clock

+5V power

DDC clock

GND

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