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DS90UB913A-Q1: Parity Error counted up by PowerDownPLL(0x27)

user6108147
Prodigy 50 points
Part Number: DS90UB913A-Q1

Hello,

Regarding 913A(DS90UB913ATRTVRQ1) revF or G, we need to perform 0x27=00 at initialization stage.  The Parity error count was counted up from 0 to 2 after applied 0x27=00.

( DS90UB914ATRHSRQ1 is also same behavior/result.)

Is this that you already knew specification? Otherwise, what is we need to do for it?

If this was already known, let me know where the desription is in the datasheet.

Regards,

  • 0
    TI__Guru** 108100 points

    Hello,

    reg 0x27 is by default = 00. Why do you need to write it again during init?

  • 0
    Prodigy 50 points

    Hello,

    Thank you for your reply.

    DS90UB913A-Q1 datasheet(rev.F or G) is saying:

    * If timing constraint t3 can not be assured, the following programming steps should be issued to the 913A via
    local I2C control (not via remote back channel) >= 10ms after the power sequence is complete. This step will
    cause a brief restart of the forward channel output:
    • Write Register 0x27 = 0x20
    • Wait >= 20ms
    • Write Register 0x27 = 0x00

    In our system, it is not accomplished t3.  So we need reset(as the above) at power-on(initialization) stage.

    Thanks in advance.

  • 0 in reply to user6108147
    TI__Guru** 108100 points

    Hello,

    okay, now I understand!

    Having 1 or 2 parity error at power up is something possible due to device not LOCKing immediately. This is normal behaviour.

    So it is recommended to reset the parity error counter after power up. This can be done by writing 1 to reg 0x03[1] and then write a 0.