This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

BQ76PL455A-Q1: How to perform open wire test

Part Number: BQ76PL455A-Q1

Hi,

I wanted to get some clarity on how to perform open wire test on the bq76PL455A-Q1 device. 

From the datasheet i gather that we have to set EQ_SQUEEZE_EN = 1. This would enable the squeeze registers when setting the corrosponding CBENBL register to test a channel. Datasheet mentions something on the lines of

"This bit is used to control the internal resistors connected across the VSENSE inputs, and changes the behavior of the CBENBL register. In the event of a broken wire, applying the resistor should cause anystored charge on the VSENSEn capacitor to bleed off. This bit is normally used for system testing purposes. When using this feature," 

What after that?

 

  • Hi Saurabh,

    The idea of the test is that if the wire is connected, there should only be a small difference in the measured voltage if you apply the squeeze resistors for a short period of time. If the wire is broken, the squeeze resistor will discharge the filter cap because it will be disconnected from the battery source. With that in mind, you can take an adc measurement before implementing the test and after, then compare the two voltages. If there is a large difference, you can assume that the cable is broken because of the drop in capacitor voltage.

    You may find Stephen's info in this thread helpful:

    e2e.ti.com/.../2178958