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AM3352: AM3352 VDD_MPU rail current confirmation

Jimmy Zhou95
Intellectual 870 points
Part Number: AM3352

Expert,

My customer has used AM3352BZCZ100 for a long time. Recently, they reached out to us for VDD_MPU current rating. In our datasheet, we have specified 1000mA as maximum current rating of VDD_MPU rail. However, the test result goes up to 1.4A as attached fig shows. Do we have proper explanation of this specs? Thanks!

Jimmy

  • 0
    TI__Guru 62835 points

    It is not clear how this current is being measured. 

    The scope snapshot provided above seems to represent many sweeps of the scope by displaying them with infinite persistence. It appears you are trying to measure the peak current rather than an average current. It is not possible to measure the peak current without removing all high frequency decoupling capacitors, which is very likely to make the device inoperable. So you are only able to measure the change in average current.

    The datasheet values were meant to be the maximum average value. So your results may be appropriate you were to integrate them over longer periods of time.

    The dark green line appears to represent an average current consumption of about 240mA. 

    The scope snapshot also shows negative current peaks of 300mA, which represents a min peak value that is about 550mA lower than the average. I'm concerned your probe is picking up noise and creating false results. 

    Your results should not show any negative current if correctly representing current consumption of the device. Therefore, I do not think your current measurement correctly represents actual current consumption of the device.

    Regards,
    Paul