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TCA4311D Datasheet(PDF) 8 Page - Texas Instruments |
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TCA4311D Datasheet(HTML) 8 Page - Texas Instruments |
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8 / 21 page  Resistor Pull-Up Value Selection Systems With Disparate Supply Voltages TCA4311 SCPS173 – DECEMBER 2008........................................................................................................................................................................................... www.ti.com The system pullup resistors must be strong enough to provide a positive slew rate of 1.25 V/ µs on the SDA and SCL pins, in order to activate the boost pullup currents during rising edges. Choose maximum resistor value R using the formula: R ≤ (VCC(MIN) – 0.6) (800,000) / C where R is the pullup resistor value in ohms, VCC(MIN) is the minimum VCC voltage and C is the equivalent bus capacitance in picofarads (pF). In addition, regardless of the bus capacitance, always choose R ≤ 16 kΩ for VCC = 5.5 V maximum, R ≤ 24 kΩ for VCC = 3.6 V maximum. The start-up circuitry requires logic high voltages on SDAOUT and SCLOUT to connect the backplane to the card, and these pullup values are needed to overcome the precharge voltage. In large 2-wire systems, the VCC voltages seen by devices at various points in the system can differ by a few hundred millivolts or more. This situation is well modeled by a series resistor in the VCC line, as shown in Figure 15. For proper operation of the TCA4311, make sure that VCC(BUS) ≥ VCC(TCA4311) – 0.5 V. 8 Submit Documentation Feedback Copyright © 2008, Texas Instruments Incorporated Product Folder Link(s): TCA4311 |
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