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TVP5150: How to reset the TVP5150

Armin Konrad
Prodigy 50 points
Part Number: TVP5150

Dear All,

My customer is having problems with the TVP5150 and do have the following questions because it looks like they will have to turn-off the TVP5150 temporarily:

- What are the possibilities to turn the device off?

- Because they do not have a signal line to turn it off via the PDN-pin, Audi is wondering whether there is a possibility to do this via I²C:

- What happens when setting the register 02h, bit0, power down mode? will the oscillator continue to run? Is the PLL still on? Can the emission of the 27MHz radiation be reduced?

- What happens when setting the register 05h, bit0, software reset? Will this cause a short system reset only or can it be kept in reset for a longer time?

Thanks and regards,

Armin

  • 0
    TI__Mastermind 43875 points
    Armin,
    Unfortunately I don't have access to any TVP5150 EVMs to be able to directly answer these questions.
    However, I believe that the PDN/power down are basically the same. They should maintain the internal register settings, and still respond to subsequent I2C transactions, but the A/D and video processing core is placed in a low power mode. My guess is that the oscillator is still enabled, but the customer should be able to easily check this by looking at the oscillator pins with an oscilloscope.
    For register 5, bit 0 I believe this is a self resetting control since it should completely reset the device back to the default settings, but the customer can verify this by reading back the register after writing to this bit.
    BR,
    Steve
  • 0 in reply to Steve Clynes
    TI__Prodigy 50 points

    Hi Steve,

    Thank you very much - however, it is not clear to me yet what should be done:

    The problem statement is basically the following:
    They see an excessive EMI at 27MHz and multiple and therefore would like to switch off the chip when the Rear View Camera (this chip is used for that device) is not used to avoid emissions. But, they cannot use the power-down-line because this does not exisit on their board and therefore would like to turn the device off via I²C instead. This then raises the question whether the 27MHz clock is still running when powered down via I²C?

    Thanks a lot in advance,
    best regards,
    Armin

  • 0 in reply to Armin Konrad
    TI__Mastermind 43875 points

    Unfortunately all I can suggest is to try it and see if the emissions are reduced enough to meet the customer requirements.

    Most likely the emissions are coming from the board, so it MIGHT help to disable the digital outputs (data and clock) rather then the TVP clock directly.

    BR,

    Steve

  • 0 in reply to Steve Clynes
    TI__Prodigy 50 points

    Hi Steve,

    Thank you - I understand.

    Can you confirm that the device can be shut down via I²C (register 02h, bit0)?

    Thanks again,
    best regards,
    Armin

  • 0 in reply to Armin Konrad
    TI__Mastermind 43875 points

    Unfortunately all I can suggest is to try it and see.

    I don't have access to any EVMs nor to any additional support resources.

    BR,

    Steve

  • 0 in reply to Armin Konrad
    TI__Prodigy 50 points
    Hi Steve,
    can you point me to someone who can help me on this?
    Thanks and regards,
    Armin
  • 0 in reply to Armin Konrad
    TI__Mastermind 43875 points
    Unfortunately this device has been NRND for a few years and support resources are no longer available.

    BR,
    Steve