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Original question:

BQ24078: BQ24078 TS Temp range change to 0 to 45 Degree

BQ24078: Reason for using SYSOFF during programming

Southern Engineering
Intellectual 715 points
Part Number: BQ24078


Hi,

The BQ24078 datasheet suggests pulling SYSOFF high to turn FET Q2 off when "factory programming where the battery is not installed". What negative effect do I mitigate by doing so in that situation?

Thanks!

  • 0
    TI__Mastermind 21590 points
    Hello,
    When the SYSOFF pin is pulled high, battery detection is not active. This prevents the detection routine from affecting rails connected to the BAT pin when the battery is absent.
  • 0 in reply to Raheem
    Intellectual 715 points

    Ok, so is it correct to understand that the reason we want to pull SYSOFF high is not that it has any effect on battery programming (our ability to program or so)? That factory programming is only mentioned here because it happens to be an example of when the battery is removed? 

    I asked this question because I did not understand how SYSOFF affected factory programming, but I assume then that the answer is that it does not. Instead the important detail was that the battery was not installed then, which means that the VBAT node will toggle between zero and ~4V until a battery is attached, which we want to avoid in case something else is connected to VBAT. Correct?

    Thanks!