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HDMI2C1-14HD Datasheet(PDF) 6 Page - STMicroelectronics |
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HDMI2C1-14HD Datasheet(HTML) 6 Page - STMicroelectronics |
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6 / 32 page  Application information HDMI2C1-14HD 6/32 DocID023674 Rev 2 In case the application is set in stand-by mode, the +5 V main supply of the application is generally powered off in order to reduce as much as possible the global power consumption. The CEC driver can be the only device still working in low power mode, allowing a wake up of the whole application through the CEC line. When the main power supply +5 V is switched off, and if the CEC bus is still active (VDD_CEC power in on state), the HDMI2C1-14HD keeps the CEC bus working properly while all other outputs of the component are put in high impedance mode. The CEC output (cable side) integrates a protection against ESD which is compliant with IEC61000-4-2 standard, level 4 (8kV contact). 2.2 DDC functional block description The DDC bus is described in the HDMI™ standards as the Display Data Channel. The topology corresponds to an I2C bus that must be compliant with the I2C bus specification version 5 (October 2012). The DDC bus is made of 2 lines: data line (SDA) and clock line (SCL). It is used to create a point to point communication link from the source to the sink. EEDID and HDCP protocols are flowing through this link, making this I2C communication channel a key element in the HDMI™ application. The DDC block integrated in the HDMI2C1-14HD allows a bidirectional communication between the cable and the ASIC. It is fully compliant with the HDMI™ 2.0 standard and its CTS, and with the I2C bus specification version 2.1. It is shifting the 5V voltage from the cable (V5V_OUT) down to the ASIC voltage level (VDD_IC) that can be as low as 1.8 V. The Figure 5 shows the functional diagram of the DDC block integrated in the HDMI2C1-14HD device. Figure 5. DDC bus functional diagram (SCL and SDA lines) The Figure 6 illustrates the electrical parameter of the DDC block specified in Table 8. SCL_IC SDA_IC VDD_IC reshaping circuit VDD_5V 5V_OUT SCL SDA VDD_IC HDMI ASIC +5V UVLO VDD_5V 5V_OUT Enable Drive HDMI connector decoupling capacitance 1 3 5 7 9 11 13 15 17 19 12 14 16 18 2 4 6 8 10 |
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