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DS90UB947-Q1: detect I2C

Bang Duong
Intellectual 370 points
Part Number: DS90UB947-Q1

Hi all,

I can't detect DS90UB947 I2C address.

I have resistor pull-up 4.7k for both pin SDA, SCL to VDDI2C 3.3V ; I2CSEL leave floating; INTB pull-up 4.7k to VDDIO 1.8V;

What can I do for detect I2C address?

Brs,

Bang

  • 0
    Intellectual 370 points
    Hi all,
    I tried set appropriate voltage on the IDx input , but still cant detect DS90UB947 I2C address.
    I really need your support.
    Brs,
    Bang
  • 0 in reply to Bang Duong
    TI__Expert 7935 points
    Hello-

    The I2C address is determined based on measuring the voltage on the IDx pin during the device power-up. Are you correctly setting the resistor divider network per datasheet recommendations? Ensure that you add some decoupling capacitance to filter out any noise on the IDx pin. Follow the connection diagram in the datasheet. Are you following the recommended power up sequence?

    Regards,
    Davor