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DS90UB928Q-Q1: DS90UB928 questions

JiaHuag Lin
Prodigy 90 points
Part Number: DS90UB928Q-Q1

We will use the combination of DS90UB927(TX) and DS90UB928(RX), and GPIO[3:0] of DS90UB928 will be used and configured to output ports.
Question1: I want to know that the define of I2S_B and LCBL on DS90UB928.
I2S_B: if we use GPIO[3:0], I2S_B must to set to "low"?
LCBL: High for long cable mode? How long distance should be set to "long cable mode"?

Question2: On the demo board, 0.1uF AC coupled capacitor (X7R) are used on DOUT+/- of DS90UB927 and RIN+/- of DS90UB928.
X7R type capacitor suit for "long cable mode"
I want to know that the capacity torrance range of these 0.1uF capacitor, and X7R type capacitor suit for "long cable mode"?

  • 0
    TI__Genius 12705 points
    Hello,
    It is not necessary to set I2S_B if you are not using I2S. Configure GPIO in registers 0x1D- 0x1F.
    X7R type 0.1uF AC coupling capacitor is suitable for all modes with 927 - 928 pairing, typical tolerance used in system is +/- 10%.
  • 0 in reply to Liam Keese
    Prodigy 90 points

    Hi Liam Keese,

    Thanks for your response.
    For I2S_B question, pin 36 and pin 37 of DS90UB928 are the multiple function pin(pin 36 is I2S_DD/GPIO[3] and pin 37 is I2S_DC/GPIO[2]).
    If we use GPIO[3:2] and disable I2S_DC/I2S_DD function, Should I2S_B be set to "High" or "Low"?