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BQ24800EVM: External BATPRES comparator - what for?

user6211252
Prodigy 50 points
Part Number: BQ24800EVM
Other Parts Discussed in Thread: BQ24800,

Tool/software:

Hi,

On BQ24800EVM (kit for BQ24800 battery charger) there are two options for detecting battery presence - BATPRES signal. According to datasheet/guide:

"The BQ24800EVM supports two methods for detecting the battery for input to the BATPRES pin. The use may either use the independent comparator of the BQ24800 or the external TPS3898A Voltage Monitor (U2.)"

I can't find what's the difference between those options? Why I should use external comparator, when there's one inside BQ24800 already. What's the advantage of one solution over the other?

  • +1
    TI__Mastermind 32771 points

    Hello User,

    user6211252 said:
    I can't find what's the difference between those options? Why I should use external comparator, when there's one inside BQ24800 already. What's the advantage of one solution over the other?

    The BQ24800 only has on internal comparator, some application require multiple. So we added a second one on the EVM for validation. Both internal and external comparator can be used for battery detection.

    best Regards,

    Christian