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DS90UB948-Q1: DS90UB948-Q1 I2S direction

Sam Kim
Prodigy 510 points
Part Number: DS90UB948-Q1
Other Parts Discussed in Thread: DS90UB947-Q1,

Hello,

Customer wants to send I2S data from display(DS90UB948-Q1) to headunit(DS90UB947-Q1). From the datasheet description, I2S port in deserializer is output and I2S port in serializer is input. Is there any other solution to send I2S data in reverse direction?

And, when only 1 I2S data input(I2S_DA) is required, can other I2S input pins(I2S_DB – I2S_DD) be used as normal GPIOs or register only GPIO?

Regards,

Sam

  • 0
    TI__Genius 10475 points

    Sam,
    Two I2S pins I2S_DC and I2S_DD are shared with GPIO2 and GPIO3, so they can be used as GPIO's. I2S_DB is register-only GPIO.

    You may find this app note on I2S helpful:
    www.ti.com/.../snla221.pdf

  • 0
    TI__Genius 12705 points
    Hello,

    you are correct, I2S data is supported in direction from serializer to deserializer. From reverse direction communication link would be from GPIO, SPI or I2C over the back channel. Depending on the required data rate GPIO may be an option to implement.
    If you are not enabling surround mode, then GPI02 and GPI03 are available for normal use. GPIO5_REG shared with I2S_DB is only allowed register only control.

    Regards,