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PCA9535: Port Expander for 192 GPIOs?

Allen Wachter
Expert 6030 points
Part Number: PCA9535
Other Parts Discussed in Thread: TCA6424A, TCA6418E

My customer is looking for a 3.3V, i2c port expander for up to 192 GPIO with addressing that can accommodate 12 16-bit devices?  The 16-bit devices I have found, like the PCA9535, can support only 8 addresses.  Do we have anything else we can offer?

Thanks 

  • 0
    TI__Genius 17205 points
    Hello Allen,
    Have you looked at the TCA6418E or the TCA6424A? You could also use a MUX to deal with addressing limitations. You would probably need to separate them anyway due to capacitive loading requirements set by I2C standard, 400pF per node.

    Look at the App Note covering how to choose I2C devices.
    www.ti.com/.../slva787.pdf
    Let me know if you have questions.

    Francis Houde