HDMI2C2-14HD datasheet(11/31 Pages) STMICROELECTRONICS

11 / 31 page

DocID024813 Rev1

11/31

HDMI2C2-14HD

Application information

Figure 9. Modification of block diagram

Note:

SCL_IC, SDA_IC, and CEC_IC have to be driven with an ASIC working with open drain

outputs.

Note:

even if not specified by HDMI standard, it is recommended to add pull-up resistance on SDA

line (cable side) to avoid floating line.

Table 1. Block diagrams references

Ref.

Typical values

Comment

27 k

Pull-up resistance on CEC bus, specified by the HDMI standard

R2, R3

47 k

Pull-up resistances on DDC bus, specified by the HDMI standard

R4, R5

10 k

Pull-up resistance on DDC bus, ASIC side, value selected to be

compliant with I2C levels

270 k

Ω to 1 ΜΩ Pull-up resistance on CEC line, ASIC side

BAT54

Small schottky diode blocking backdrive current flowing toward the

VDD_CEC supply

C1, C2, C3

and C5

100 nF

Decoupling capacitance on power supplies

1 µF

ESD protection enhancement capacitance (option)

CEC

driver

SCL_IC

SDA_IC

SDA

SCL

CEC bus

VDD_CEC_IC

VDD_IC

VDD_CEC

DDC_EN

VDD_IC

VDD_CEC_IC

CEC_IC

5V_IN

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- /HPD_IC

TMDS

lines IN

TMDS

lines OUT

HEAC+

HEAC -

HDMI2C2

HDMI

ASIC

HDMI

connector

- 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

EEPROM

(EEDID)

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