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MSP430AFE253: 24-bit differential AD acquisition issue

Yale Li 李耀先
Expert 4660 points
Part Number: MSP430AFE253

Hi Team,

Here's an issue from the customer may need your help:

I am currently using MSP430AFE253 to collect battery internal resistance. The device sends out PWM pulse waves, then measures the AD value when the PWM pulse waves are high or low.

When the battery is in a normal state (without charging operation), the measured AD value is stable, as shown in the figure below:

When the battery is charging, the measured AD value is abnormal, which may be due to AC interference, as shown in the figure below:

How to resolve this?

--

Thanks & Regards

Yale

  • +1
    TI__Mastermind 29105 points

    Hello Yale,

    It does seem like some sort of noise source on the signal, as the ADC appears to be configured and reading correctly in the first capture but it then the data looks bad when the external system starts charging.  Can they see this noise on the input with a oscilloscope?

    At this point, the issue doesn't appear to be coming from the MSP430 but the system. 

    How far away is the battery?  Are they running wires to it and if so, are they twisted together? 

    How do they measure internal resistance?  Is it through a current measurement?  Wouldn't active battery charging affect these measurements? 

    Thanks,

    JD   

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