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TCA6408A-Q1: Please review the schematic

Chase Jeong
Mastermind 7505 points
Part Number: TCA6408A-Q1

Dear TI experts,

My customer made their first schematic with TCA6408A-Q1. Could you review the schematic below?

Best regards,

Chase

  • 0
    TI__Mastermind 47828 points

    Hi Chase,

    Check Comments (If Needed)
    Local Decoupling Capacitors

    100 nF decoupling capacitors present on the VCCP and VCCI supply lines. These are good values
    Verify the schematic pinout matches the data sheet pinout. Correct
    Verify that the SDA, and SCL net names match SDA and SCL pinout. Correct
    Check that the pullup resistors are present on the SDA and SCL net within the schematic. Pull-up resistors are required. I am assuming these are in another page of the schematic. 
    Unused GPIO pins are biased to either VCC or GND via resistor. No unused GPIO pins
    Device address is unique on the bus unless using an I2C switch or I2C MUX to resolve conflicts. ADDR pin correctly connected to GND
    If the device has a #RESET pin, bias the pin high (preferably with a pullup resistor) after powering up R8919 is a very strong pull-up resistor at 22ohm. I don't think the external GPIO would be able to drive this pin LOW if it needed to conduct and external /RESET condition? Is this a problem for the implementation? 
    If the device has a #INT pin and the #INT pin is used, tie this pin to a pullup resistor. Interrupt pin is corrected connected to pull-up resistor to the supply voltage. 

    Regards,

    Tyler