• State
  • Locked Locked
  • Replies 3 replies
  • Subscribers 62 subscribers
  • Views 124 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

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.

BQ40Z50-R1: CHG pin of BQ40Z50-R1 is damaged

guoqing shi
Intellectual 305 points
Part Number: BQ40Z50-R1
Other Parts Discussed in Thread: BQSTUDIO

Hello，engineers：

           We use BQ40Z50-R1 scheme to make battery management system，There were two problems with the product made. The customer was unable to charge it. After taking back the battery, the test found that the CHG pin of BQ40Z50-R1 was damaged, and the drive voltage was only about 1V。I upload the gg file, please have a look。2054DH-unable-charge.gg.csv

         If you need any more documents, please let me know。

         Look forwad to your reply！

  • 0
    TI__Guru** 102355 points

    Hello Guoqing,

    Can you please share a short log or a screenshot of the bqstudio registers page for the pack exhibiting this behavior? It sounds like a protection may be triggered and the gauge is not enabling the charge FET. How are you able to confirm the pin was damaged or if the gauge is simply keeping the FET off?

    From your .gg file it doesn't look like a PF occurred since the PF Status registers are still default. Do you have Black Box Recording enabled?

    Sincerely,

    Wyatt Keller

  • 0 in reply to Wyatt Keller
    Intellectual 305 points

    Hi，Engineer：

           glad to receive your reply！

    How to confirm the damage of CHG pin:Confirm that the MOS tube functions normally， confirm that the CHG pin of BQ40Z50-R1 is enabled through the upper computer, and then use a multimeter to measure the voltage of CHG pin. The voltage is almost the same as the source voltage of MOS pin;; Measure the DSG pin voltage with the same method, and the voltage is about 10V higher than the source pole of the discharge MOS tube

  • 0 in reply to guoqing shi
    TI__Guru** 102355 points

    Hello Guoqing,

    Make sure to enable scanning as well for the most recent display, I'm not sure if this is a older register page reading since it is not updated constantly unless scanning is turned on.

    It does look like the gauge is trying to enable the charge FET from the registers, so it may be damaged. Can you share the schematic as well so we can review? The only way for the pin to become damaged is if it is exposed to conditions outside the absolute maximum ratings.

    If there is a low impedance path on the CHG pin this can also cause the voltage to collapse since the charge pumps cannot drive much current continuously.

    Sincerely,

    Wyatt Keller