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DS90UB949-Q1: For GPIO0/AUX I2S configuration

Lee, Sam
Expert 6015 points
Part Number: DS90UB949-Q1
Other Parts Discussed in Thread: DS90UB948-Q1

Hi team,

A customer has suffered from GPIO0 configuration of DS90UB949-Q1. (The GPIO0 input comes from DS90UB948-Q1 and DS90UB949-Q1 outputs the GPIO0.)

And currently, the GPIO0 works normally after disabling the AUX_I2S of MODE_SEL0 along with BCC GPIO settings. However, there is not detailed information for GPIO/AUX I2S settings in DS90UB949-Q1 datasheet, so they want to get the application note or detailed document. Do you have any documents?

      

Thanks,

Sam Lee

  • 0
    TI__Intellectual 1565 points

    Hi Sam,

    7.3.15.3 notes that GPIO_REG bits can override I2S

    Here is an app report that shows how to use the I2S interface with an IVI FPD-Link pair.

  • 0 in reply to Mike Leister
    TI__Expert 6015 points

    Hi Mike,

    Thank you for your reply. There are futher questions about that.

    GPIO0 input -> DS90UB948-Q1 -> DS90UB949-Q1 -> GPIO0 output

    -. Is it okay to connect GPIO0 pin and INTB_IN pin of DS90UB948 together?

    -. The datasheet recommends "if unused, tie to an external pulldown" for INTB_IN pin. BW, is it okay even if the exgternal pull up is used?

    Thanks,

    Sam Lee

  • 0 in reply to Lee, Sam
    TI__Intellectual 1565 points

    Hi Sam,

    At power-up, INTB_IN is an input with a weak pull-down, and GPIO0 is an output set to logic low.

    To drive these together from a single output:

    • Ensure the pin driving these powers up either in logic low or high impedance.  It must not power up as a logic high.
    • Configure GPIO0 as an input.

    Mike