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DS90UB935-Q1: Use GPIO for I2S audio signal

Marc Liu
Expert 3670 points
Part Number: DS90UB935-Q1
Other Parts Discussed in Thread: DS90UB936-Q1, , DS90UB954-Q1, DS90UB953-Q1

Hi Team,

Customer want to know the max rate GPIO_x of DS90UB935-Q1/ DS90UB936-Q1 can meet? Can GPIO_x be used for I2S signal? 

I find one application below, but it can't tranfer video+audio at the same time. so customer want to use GPIO pin.

https://e2e.ti.com/support/interface-group/interface/f/interface-forum/1136852/faq-ds90uh941as-q1-how-to-configure-fpd-link-iii-94x-audio?tisearch=e2e-sitesearch&keymatch=fpd%25252520link%25252520audio# 

Thank you!

Marc

  • 0
    TI__Expert 8030 points

    Hi Marc,

    Marc Liu said:
    Customer want to know the max rate GPIO_x of DS90UB935-Q1/ DS90UB936-Q1 can meet?

    For the maximum data rate specifications of the GPIO pins over the forward and the back channel, I recommend that you refer to Table 7-5 and Table 7-6 of the DS90UB935-Q1 datasheet, and Table 7-9 and 7-10 of the DS90UB936-Q1 datasheet. 

    Marc Liu said:
    Can GPIO_x be used for I2S signal? 

    The GPIO pins of the DS90UB935-Q1/DS90UB936-Q1 are capable of supporting I2S communications, but only for certain SCK frequencies. For more information about this, please refer to this application note: https://www.ti.com/lit/an/snla314a/snla314a.pdf

    The application note specifically refers to the DS90UB953-Q1/DS90UB954-Q1, but the same concepts can also be applied for the DS90UB935-Q1/DS90UB936-Q1.

    Regards,

    Kenneth