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UCD90124A: CODE REVIEW FOR UCD90124A

Richard Yang1
Intellectual 1220 points
Part Number: UCD90124A
Other Parts Discussed in Thread: UCD90124,

Hi Team:

   could you please help to review the code of UCD90124 for the customer side, the design specification and circuit is shown as attachment, if for more information required, I can negotiate with you through email, thanks!

T99O297T00_Power On Sequence Control_20210305.pdf

T99O297T00_TI_UCD90124A_20210325.pdf

UCD90124A_0x34_Q2A_R01_20210323.xml

  • 0
    TI__Guru 65610 points

    Hello

    Please review schematics guideline: https://www.ti.com/lit/pdf/slvub50 

    For the schematics, Please refer below comments:

    1. for the brownout circuit, a 1.333mF hold up capacitor is required. in the schematics it is only 0.99mF. 

    2. 4.99ohms resistor is required between V33A and V33D, Do not use inductor(L3)

    3. Missing Cap on V33DIO1.

    4. The Pull-up resistor on SCL and SDA shall be between 1K and 2K. 

    Via looking the project file, it seems that they want to control the power down sequencing when the signal PSU_VOUT_PWROK is de-asserted. But setting this signal as sequencing off dependencies of rails do not trigger the power down. They have to connect this signal to the PMBUS_CTRL pin of UCD90124A and change the on/off_config setting to control pin only.

    Please refer the attached quick guide to understand this.

    5710.UCD90xxx 简易使用手冊.pptx

    Regards

    Yihe