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BQ76940: BQ76940

Arash Iranfar
Prodigy 70 points
Part Number: BQ76940

Hi there. 

I've been trying to develop an evaluation board for BQ76940 with what I can find in stores near me (not quite the same parts mentioned in the TI reference for evaluation board but very similar ones.)

The board is working fine for most of the time except when the Short circuit event happens! In the case of short circuit event, the microcontroller I used (atmega328) resets itself most probably due to some sort of fluctuations in power supply. Does the internal LDO remain reliable during short circuit event (which means I don't know where else to look to find out why my microcontroller resets) or do I need to consider a backup power supply for my board (I was thinking LM2596hvs)? 

Also, Is it ok to attach the battery cells to the board with a 2*16 connector or should we attach them one by one in a predefined order?

I really appreciate any help you can provide.

  • 0
    TI__Guru 54715 points
    Hi Arash,
    The internal LDO remains stable during short circuit if power remains applied. Short circuit can deplete the power supply caps and cause problems, be sure your caps are adequately sized and REGSRC is blocked from discharge. Also be cautious of the construction and connection of references to the high current path, "ground" references can move substantially with short circuit.
    Ground is recommended to be connected first. The connector will likely work but bottom up is more certain with lower voltage steps applied to the circuit.
  • 0 in reply to WM5295
    Prodigy 70 points

    Thanks a lot. That ought to do it. I'll change the board on some parts and test it again. I don't think that there is anything left with my question that is unanswered so I'll close the post. Thanks again :)