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TCA9535 Datasheet(PDF) 27 Page - Texas Instruments |
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TCA9535 Datasheet(HTML) 27 Page - Texas Instruments |
27 / 46 page r p(max) b t R 0.8473 C = ´ CC OL(max) p(min) OL V V R I - = VCC 3.3 V 5 V LED Pn VCC VCC LED Pn 100 k 27 TCA9535 www.ti.com SCPS201D – AUGUST 2009 – REVISED JULY 2016 Product Folder Links: TCA9535 Submit Documentation Feedback Copyright © 2009–2016, Texas Instruments Incorporated Figure 35. High-Value Resistor in Parallel With LED Figure 36. Device Supplied by Lower Voltage 9.2.2 Detailed Design Procedure The pull-up resistors, RP, for the SCL and SDA lines need to be selected appropriately and take into consideration the total capacitance of all slaves on the I2C bus. The minimum pull-up resistance is a function of VCC, VOL,(max), and IOL as shown in Equation 5. (5) The maximum pull-up resistance is a function of the maximum rise time, tr (300 ns for fast-mode operation, fSCL = 400 kHz) and bus capacitance, Cb as shown in Equation 6. (6) The maximum bus capacitance for an I2C bus must not exceed 400 pF for standard-mode or fast-mode operation. The bus capacitance can be approximated by adding the capacitance of the TCA9538, Ci for SCL or Cio for SDA, the capacitance of wires/connections/traces, and the capacitance of additional slaves on the bus. For further details, refer to I2C Pull-up Resistor Calculation application report, SLVA689. |
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