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TPS65185: TPS65185 not coming up

Anonymous
Anonymous
Guru 17045 points
Part Number: TPS65185
Other Parts Discussed in Thread: TPS65186

Hello there,

I created a PCB with TSP65185 following the datasheet (it looks almost exactly as the demo board TI provides).

The problems are the following:

 - PWRUP pin can't come up, the IC is pulling it down somehow even if pull it up (via a STM32 GPIO) reaches a voltage close to zero.

 - I2C won't respond at all, pulling WAKEUP pin up works but I2C is not responding. I analized the line with a logic analizer and everything looks fine but no ACK will come.

What can I possibly take a look at to debug this issue? It seems to me there's some issue I can't discover.

Thanks

  • 0
    TI__Expert 5650 points
    Hi David,

    Do you have input voltage present all the time and correct level?

    Have you checked page 19 from TPS65185 datasheet? It instructs how to power up device correctly.

    Best regards,
    Jari Niemelä
  • Anonymous
    0 Anonymous in reply to Jari Niemela13
    Guru 17045 points
    Yes I did. I tried using I2C and no luck, then I just tried to pull the pins up, since it will use the default power sequence that's defined in the datasheet, and no luck as well.
  • 0 in reply to Anonymous
    TI__Genius 10885 points

    Hi David,

    What is the exact part number of the populated device?

    A TPS65186 on a board designed for the TPS65185 might behave this way.

    Have you tried both i2c addresses? The TPS65185 uses 0x68h and the TPS65186 uses 0x48h.

    Best Regards,

    Rick S.

  • Anonymous
    0 Anonymous in reply to Richard Solarski
    Guru 17045 points

    Hey Richard, thanks for the reply

    The device is a TPS65185 (written on top of the IC). It literally reads TPS 65185 TI 751 ADPS G4.

    Don't you find it weird the fact that I can't pull the PWRUP pin up properly? I thought it was only an input.

    I've doublechecked the pin mappings, but will do another time just in case.

    David