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TMDS181I Datasheet(PDF) 45 Page - Texas Instruments |
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TMDS181I Datasheet(HTML) 45 Page - Texas Instruments |
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45 / 58 page  ± W R C D D 9 W 9 ± H K C C u p (m in ) s in k V R I BUS MASTER TMDS181 TMDS181 TMDS181 BUS SLAVE Rup Rup Rup Rup 3.3 V 5 V 5 V 3.3 V RUPsource RUPsink RUPsource C1 C2 C1 C2 C2 5 V C2 5 V RUPsink C3 C3 SOURCE Active Cable SINK TSCL TSDA SDA_SRC SLK_SRC SLK_SINK SDA_SINK SLK_SRC SDA_SRC SDA_SINK SLK_SINK SLK_SRC SDA_SRC SDA_SINK SLK_SINK RSLK RSDA TMDS181, TMDS181I www.ti.com SLASE75A – AUGUST 2015 – REVISED OCTOBER 2015 9.2.3 Application Chain Showing DDC Connections The DDC circuitry inside the TMDS181 allows multiple stage operation (see Figure 36). The retimer devices can be connected to any of the bus segments. The number of devices that can be connected in series is limited by repeater delay/time of flight considerations for the maximum bus speed requirements. Figure 37. Typical Series Application 9.2.3.1 Detailed Design Procedure 9.2.3.1.1 DDC Pullup Resistors NOTE This section is informational only and subject to change depending upon the specific system implementation. The pullup resistor value is determined by two requirements. 1. The maximum sink current of the I2C buffer: The maximum sink current is 3 mA or slightly higher for an I2C driver supporting standard-mode I2C operation. (1) 2. The maximum transition time on the bus: The maximum transition time, T, of an I2C bus is set by an RC time constant. The parameter, k, can be calculated from Equation 3 by solving for t, the times at which certain voltage thresholds are reached. Different input threshold combinations introduce different values of t. Table 10 summarizes the possible values of k under different threshold combinations. T = k × RC where • R is the pullup resistor value. • C is the total load capacitance. (2) (3) Copyright © 2015, Texas Instruments Incorporated Submit Documentation Feedback 45 Product Folder Links: TMDS181 TMDS181I |
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