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    BMA456 supply voltage

    SWKANG
    New Poster

    BMA456 supply voltage

    Dears,

    Hello. I have questions about BMA456_Vdd & Vddio.

    The application's main power is 5V to be needed LDO(Step down regulator) for 3.3V. But I want voltage divider instead of LDO.

    In this case, I'm concerning about unstable and ripple. Pls refer to below pictures.

    1) Don't you recommend voltage divider way to supply power?

    2) Does BMA456 has voltage regulators at Vdd and Vddio?

    3) If supplying voltage has ripple or unstable (within the range, min to max), is output data influenced by it? 

    BMA456.jpg

    BMA456_a.jpg

    I'm looking forward to get your advice.

    Thank you.

    3 REPLIES 3
    BSTRobin
    Community Moderator

    Re: BMA456 supply voltage

    Hello SWKANG,

    For your question:
    1.Yes, voltage divider couldn't provide enough driver current and energy conversion;
    2.No. It requires a power supply range;
    3.Power supply ripple will cause noise.

    SWKANG
    New Poster

    Re: BMA456 supply voltage

    Thank you for your advice.

    one more question. Regarding 2nd reply,

    if there is no regulator or charge pump inside, how to supply stable and uniform voltage to internal block (MEMS or ASIC) in Vdd range 1.62V to 3.6V?

    I'm expecting voltage drop within the Vdd range as below. Does BMA456 has stable power block against unstable voltage like votage drop?

     

    BSTRobin
    Community Moderator

    Re: BMA456 supply voltage

    Hello SWKANG,

    The applications we encounter are powered by LDO or DC-DC power supply. We haven't tested your hardware design.

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