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Original question:

ADS1258: Sample code to support 16 channels request

BQ77216: Power management forum

Jayden Li
Expert 3295 points
Part Number: BQ77216

Hi team,

I don't understand the 2nd and 3rd line in below picture shown in BQ77216 datasheet: 

  • I don't see any BQ77216 spin is Active High VDD, so we do not need to pay attention to this spec for a spin which is Active High 6V, right?
  • How should I understand the second spec? If a spin is Active High VDD, and a OV event is triggered, then COUT and DOUT will be pulled to 1V? if yes, why under this situation, only 1V is pulled up?
  • How should I understand the 3rd spec? Especially the 'VDD-VCOUT or VDOUT' in the test condition, what is the detailed condition, I cannot understand this very well.

Thanks!

Jayden Li

  • 0
    TI__Mastermind 25980 points

    Hi Jayden,

    Going through your questions:

    I don't see any BQ77216 spin is Active High VDD, so we do not need to pay attention to this spec for a spin which is Active High 6V, right?

    That's correct. You can ignore the Active High VDD spec when using an Active High 6V spin.

    How should I understand the second spec? If a spin is Active High VDD, and a OV event is triggered, then COUT and DOUT will be pulled to 1V? if yes, why under this situation, only 1V is pulled up?

    It looks like this test case might have a typo. COUT and DOUT should be pulled up to VDD in this case, hence Active High VDD.

    How should I understand the 3rd spec? Especially the 'VDD-VCOUT or VDOUT' in the test condition, what is the detailed condition, I cannot understand this very well.

    I am not entirely sure what the author of the datasheet meant by VDD - VCOUT or VDOUT, however the test condition is essentially saying that only one cell is connected and VDD = Vx (the voltage of that cell).

    Hopefully this answers your questions!

    Regards,

    Max Verboncoeur

  • 0 in reply to Max Verboncoeur
    TI__Expert 3295 points

    Hi Max,

    Thanks for your feedback.

    • Can you help check internally if this is really a typo? Thanks!
    • Could you help further check the meaning of 'VDD - VCOUT or VDOUT', my customer is very confused about that.

    Thanks!

    Jayden Li

  • 0 in reply to Jayden Li
    TI__Mastermind 25980 points

    Hi Jayden,

    After consulting I have found that there is no typo in the datasheet.

    See this thread that has a very similar question to yours.

    Essentially the values stated in the cases with VDD - VCOUT or VDOUT in the conditions are the difference between VDD and VCOUT or VDOUT.

    So, the given typical value of 1V for those two cases means that in those cases VCOUT and/or VDOUT = VDD-1V (typically).

    I hope this clarifies things!

    Regards,

    Max Verboncoeur

  • 0 in reply to Max Verboncoeur
    TI__Expert 3295 points

    Hi Max,

    Many thanks!

    Jayden Li