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UCD9222+UCD7242 for C6655 just creat one powe rail

tang huan
Prodigy 130 points

Other Parts Discussed in Thread: UCD9222

Dear SIR,

I try to down load the right .XML file for UCD9222 and  be successful.

however, the new problem occur. the UCD9222 just creat one power rail instead of two and I can confirm the SCH of two power rails are exact the same. Meanwhile, this part  SCH is the same as DEMO of C6657.

Can you give some suggestion to resolve this issue?

 

Thanks!

Best regards!

huan tang

  • 0
    TI__Mastermind 42545 points

    Hi Huan,

    The EVM schematic and the configuration for the UCD9222 will provide two separately controlled power suppl rails, CVDD and CVDD1. What do you mean when you sat that you have one power rail instead of two? Are you saying that one of the rails isn't working or are you saying that they are set to the same voltage?

    Regards, Bill

  • 0 in reply to Bill Taboada
    Prodigy 130 points

    8508.Attachment.rar

    Hi Bill,

    Today, I have try to verify the result.

    I make EN1 and EN2 high all the time.(EN2 is behind EN1 about 50ms) .

    Firstly, after power reset, the power rail CVDD comes up at the right time, but CVDD1 do not comes up.the  flowsheet is the flowsheet1（reffer to the attachment）

    Secondly， I add one reset after the powergood signal is valid. To my surprise,the power rail CVDD1 comes up.

    but ther is also a strange isuue: Power rail CVDD1 is not stable. it will be stable for some time and will be low after hold high for some time, which is not controlled by me. the flowsheet is the flowsheet2 and some waveform pictures.

    Thanks

    Regards 

    HUAN TANG8688.Attachment.rar