HDMI2C1-14HD Datasheet, PDF (13/32 Pages) STMicroelectronics – HPD pull down and signal conditioning

HDMI2C1-14HD
Application information
Figure 12. TMDS lines ESD protection functional diagram
VDD_IC
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
5V_OUT
HDMI
connector
DAT_D2+
DAT_D2 -
DAT_D1+
DAT_D1-
DAT_D0+
DAT_D0 -
DAT_CLK+
DAT_CLK-
ESD_DSICH
1
2
3
4
5
6
7
8
9
10
11
13
12
14
15
17
16
19
18
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
VDD_IC
4 TMDS channels
8 lines
over current
detect
HPD
DDC data
DDC clock
HEAC -
HEAC+
HDMI2C1-14HD
TMDS
lines IN
TMDS
lines OUT
VDD_IC _+5V
C6
ESD_DISCH
R7
C3
C4
VDD_IC
R4
R5
VDD_CEC_IC
VDD_5V
VDD_IC
FAULT
HPD_IC
SDA_IC
SCL_IC
HEAC-
HEAC+
VDD_CEC_IC
CEC
driver
R6
C5
CEC_IC
GND
5V_OUT
HPD
SDA
SCL
Utility
VDD_CEC
CEC
C2
R3 R2
VDD_CEC
D1
C1
R1
TMDS data 2+
TMDS
TMDS
ddaattaa-
2
1+
TMDS
TMDS
ddaattaa-
1
0+
TMDS
TMDS
dCalota-ck0+
TMDS Clo-ck
+5V power
HPD / HEAC-
SDA
SCL
Utility / HEAC+
CEC bus
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