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TVP5154 questions,pls help

Kailyn Chen
Genius 9560 points
Other Parts Discussed in Thread: TVP5154

Dears;

    I have a customer who used TVP5154 to wirte the register, but he found that if  there is one time to write the wrong value of the register, it must reset, otherwise even if  rewrite the right value, then the result is still error, so I adivse the customer reset "ms" after  power up and before initialization  to ensure TVP5154 is stable, but it couldn't solve the questions.In addition, sometimes, write the wrong value of the register, after corrected, read all"0X00", but the I2C timing is OK.  I don't know why.Pls help. Thank you.

 

 

Best regards

Kailyn

 

  • 0
    TI__Genius 15310 points

    Hello Kailyn,

    Can you give me which register you have problem when trying to write and read back?  Note, there is some read-only register.  Also, the TVP5154 has 4 decoders, have you select the correct decoder when you read back?

    From power up, it needs at least 100-300ms after reset before writing to I2C get acknowledge.

    Regards,

    Viet

  • 0 in reply to Viet Dinh
    TI__Genius 9560 points

    Hi,viet;

      Thank for your reply, and I am sorry to reply to you.

     Take register 0x03 and 0x15 for example, the  process is as follows: first reset, write register 0x03 and 0x15 new value( 0x0D and 0x81), and  this time we read the right value that we wrote, and the output signal is also right, but if we changed another value without reset, now the value is the same with the last time(still 0x0D and 0x81 ), that is to say the value we read is the first  value, but if we reset again, we could rewrite the register. So I don't know why,  please give me your valued advice.

     

     

    Best regards

  • 0
    TI__Genius 15310 points

    Hi Kailyn,

    I am out of office today and will get back to you on this tomorrow.

    Regards,

    Viet

  • 0 in reply to Viet Dinh
    TI__Genius 15310 points

    Hello Kailyn,

    I am sorry that you have problem with read/write to the registers.  Can you give me the registers value of FEh and FFh?  Those registers is used for selecting read/write to which decoders (TVP5154 has 4 decoders).  I also attached the TVP5154 data sheet if you don't have it handy.

    Regards,

    Viet

    TVP5154_Product_Spec_Rev_1.04.pdf
  • 0 in reply to Viet Dinh
    TI__Genius 15310 points

    Hi Kailyn,

    I wonder you have the same problem as this one:

    http://e2e.ti.com/support/data_converters/videoconverters/f/376/p/43107/150434.aspx#150434

    Though you might want to know.

    Regards,

    Viet