• State
  • Locked Locked
  • Replies 1 reply
  • Subscribers 62 subscribers
  • Views 203 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.

BQ76940: BQ76940 xREADY fault in EMC test

Dong Shen1
Prodigy 110 points
Part Number: BQ76940

Hi all，

My customer encountered a rare problem when using bq76940.

1. Bq76940 can work normally under normal working conditions;

2. When EMC testing is carried out in China, sometimes bq76940 will have a ready fault;

3. When conducting EMC test abroad, bq76940 often has xREADY fault, and can work normally after leaving EMC test environment;

In previous questions, some colleagues mentioned that the strong magnetic field environment may interfere with the power pin or TSN pin, resulting in an error.

Link：https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/923907/bq76940-xready-trigger-reason-identify?tisearch=e2e-sitesearch&keymatch=BQ76940%20xREADY#

Are there any documents or posts with such problems that you can share?

BRs，

Sanders

  • 0
    TI__Guru 54715 points

    Hi Sanders,

    I don't know of other documents or posts.  The common reference for EMI in battery pack electronics is www.ti.com/lit/slua368 , it was written with an earlier product family, but the principles still apply.

    Common with other electronics you generally want to filter signals as they come into the board and provide a low impedance at the input to a diode so that a noise signal is not rectified into a apparent real signal. Route signals so that any input reaches the input filter capacitors before the IC pins.