HDMI2C2-14HD Datasheet, PDF (11/31 Pages) STMicroelectronics – ESD protection and signal booster for HDMI™ 1.4 sink interface

HDMI2C2-14HD
Application information
Figure 9. Modification of block diagram
VDD_IC
4 TMDS channels
8 lines
HDMI
ASIC
DDC data
DDC clock
HEAC+
HEAC -
HPD
VDD_IC
HDMI2C2 - 14HD
TMDS
lines IN
TMDS
lines OUT
ESD_DISCH
C6
DDC_EN
VDD_IC
5V_IN
C3
VDD_IC
R4
R5
SDA_IC
SCL_IC
HEAC+
HEAC- /HPD_IC
HPD
SDA
SCL
Utility
VDD_CEC_IC
R6
CEC
driver
VDD_CEC_IC _{VDD_CEC}
C5
CEC_IC
GND
CEC
C2
EEPROM
(EEDID)
R3
VDD_CEC
C1
D1
R1
TMDS data 2+
TMDS data 2-
TMDS data 1+
TMDS data 1-
TMDS data 0+
TMDS data 0-
TMDS Clock+
TMDS Clock-
+5V power
HDMI
R2 _connector
HPD / HEA- C
SDA
SCL
Utility / HEAC+
CEC bus
Note:
Note:
Table 1. Block diagrams references
Ref.
Typical values
Comment
R1
R2, R3
27 kΩ
47 kΩ
Pull-up resistance on CEC bus, specified by the HDMI standard
Pull-up resistances on DDC bus, specified by the HDMI standard
R4, R5
R6
10 kΩ
Pull-up resistance on DDC bus, ASIC side, value selected to be
compliant with I2C levels
270 kΩ to 1 ΜΩ Pull-up resistance on CEC line, ASIC side
D1
C1, C2, C3
and C5
BAT54
100 nF
Small schottky diode blocking backdrive current flowing toward the
V_{DD_CEC} supply
Decoupling capacitance on power supplies
C6
1 µF
ESD protection enhancement capacitance (option)
SCL_IC, SDA_IC, and CEC_IC have to be driven with an ASIC working with open drain
outputs.
even if not specified by HDMI standard, it is recommended to add pull-up resistance on SDA
line (cable side) to avoid floating line.
DocID024813 Rev1
11/31
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