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CM2030-A0TR Datasheet(PDF) 6 Page - ON Semiconductor |
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CM2030-A0TR Datasheet(HTML) 6 Page - ON Semiconductor |
6 / 17 page CM2030 Rev. 5 | Page 6 of 17 | www.onsemi.com When I 2C devices are driving the external cable, an internal pulldown on DDC_XX_IN guarantees that the VOL seen by the ASIC on DDC_XX_IN is equal to or lower than DDC_XX_OUT. Multiport DDC Multiplexing By switching LV_SUPPLY, the DDC/HPD blocks can be independently disabled by engaging their inherent “backdrive” protection. This allows N:1 multiplexing of the low-speed HDMI signals without any additional FET switches. Consumer Electronics Control (CEC) The Consumer Electronics Control (CEC) line is a high level command and control protocol, based on a single wire multidrop open drain communication bus running at approximately 1kHz (See Figure 3). While the HDMI link provides only a single point-to-point connection, up to ten (10) CEC devices may reside on the bus, and they may be daisy chained out through other physical connectors including other HDMI ports or other dedicated CEC links. The high level protocol of CEC can be implemented in a simple microcontroller or other interface with any I/OD (input/open-drain) GPIO. Figure 3. Typical µC I/OD Driver To limit possible EMI and ringing in this potentially complex connection topology, the rise- and fall-time of this line are limited by the specification. However, meeting the slew-rate limiting requirements with additional discrete circuitry in this bi-directional block is not trivial without an additional RX/TX control line to limit the output slew-rate without affecting the input sensing (See Figure 4). Figure 4. Three-Pin External Buffer Control Simple CMOS buffers cannot be used in this application since the load can vary so much (total pullup of 27kΩ to less than 2kΩ, and up to 7.3nF total capacitance.) The CM2030 targets an output drive slew-rate of less than 100mV/ms regardless of static load for the CEC line. Additionally, the same internal circuitry will perform active termination, thus reducing ringing and overshoot in entertainment systems connected to legacy or poorly designed CEC nodes. RX TX I/OD GPIO CEC RX TX TX_EN CEC Slew Rate Limited 3-State Buffer X |
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