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ISL54103IHZ-T7 Arkusz danych(PDF) 6 Page - Intersil Corporation |
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ISL54103IHZ-T7 Arkusz danych(HTML) 6 Page - Intersil Corporation |
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6 / 8 page  6 FN6303.2 October 14, 2011 Functional Description DDC Overview DDC is a 2-wire serial communication standard based on the I2C standard. Devices communicate to each other using one clock (SCL) and one data (SDA) line. These are both bidirectional. Each signal is connected to a positive supply voltage via a current-source or pull-up resistor (see “System Diagram” on page 3). When the bus is free, both lines are HIGH. The output stages of all devices connected to the bus must have an open-drain or open-collector to perform the wired-AND function. Simple pull-up resistors on the clock and data lines work well unless there are long signal lines. The combined capacitance of long cables increases the rise time on the signal to such an extent that the communication becomes unreliable or fails to meet the bus timing specifications. Smaller value resistors can sometimes compensate for the extra capacitance, but this increases the current consumption when the signal lines are pulled LOW. ISL54103 Operation To improve the operation of the DDC where larger bus capacitance exists, the ISL54103 provides active pull-up using switched current sources. When the bus is idle and both lines are HIGH, a standby pull-up current of 100µA is used to maintain the signal level while minimizing power consumption. When either of the two signals is pulled LOW, an active pull-up current of 275µA maintains a good VOL noise margin. FIGURE 5. VTRIPH VOLTAGE FIGURE 6. IDD CURRENT, DDC1 = DDC2 = OPEN FIGURE 7. BOOST PULL-UP CURRENT vs DDC VOLTAGE Typical Performance Curves (Continued) 0.50 0.55 0.60 0.65 0.70 0.45 0.40 0.35 0.30 -40 -20 0 204060 80 100 -60 TEMPERATURE (°C) VDD = 5.5V VDD = 2.7V 75 80 85 90 95 70 65 60 55 -40 -20 0 204060 80 100 -60 TEMPERATURE (°C) VDD = 5.5V VDD = 2.7V 2.0 2.5 3.0 3.5 1.5 1.0 0.5 0 12 34 5 0 DDC VOLTAGE (V) 6 VDD = 5.0V VDD = 2.7V ISL54103 |
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