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LP87332A-Q1: J6Entry for PMIC POWER LP87332A

Genius 3260 points

Replies: 2

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Part Number: LP87332A-Q1

Dear,


we use LP87332A for J6 Entry,  we find the LDO1 should be 3,3V, but measurment only 1.8v

and LDO2 should be 3.3V, but measurment only 0v.


LP87322E LDO1 should be 1.8V, but only 0.4V

LDO2 should be 1.8v, but only 0.4v

below as schematic:

nu100_20180419-core-TI.pdf

it's about user guide table 5 setting?

If any suggestion, Please advise me.

Thanks,

Best regards,

Lawrence.

  • Hi Lawrence,

    Our device expert is out of office today for US holiday, but reviewing the LP8733-Q1 and LP8732-Q1 User’s Guide to Power TDA3x, it looks like LDO0 and LDO1 are not enabled by default for LP87322E-Q1 and LDO1 is not enabled by default for LP87332A-Q1 so it makes sense that they would be measuring 0 V until the processor writes set them to the desired voltage:

    They also show as having EN = 0 in the datasheet. 

    Please check and make sure that the processor - PMIC communication is working properly and that the software is configured to support LP873x based solution. The DRAx Infotainment SoCs forum can help with software setup.

    Thank you,
    Kevin LaRosa
    --------------------------------------------------
    For more information on Multi-Channel Power Management ICs visit www.ti.com/PMIC 

  • In reply to Kevin LaRosa:

    Hi Lawrence,

    Note that LP87332A-Q1 + LP87322E-Q1 are the power solution for TDA3x. This is why the LDOs are not at the correct voltage.

    For J6Entry, we recommend LP87332D-Q1 + LP873220-Q1. You can see the power solution user's guide here: www.ti.com/.../snvu577

    Regards,
    Karl

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