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BQ25895: BC1.2 Detection

Folorunsho Atanda
Prodigy 10 points
Part Number: BQ25895
Other Parts Discussed in Thread: BQ25890H, BQ25898

I was reading through the datasheet and it said that the BQ25895 does BC1.2 detection via the D+/D- pins. How exactly does that work? Is this a feature by default? Can it be configured?

  • 0
    TI__Guru**** 166116 points

    Hi Folorunsho,

    For the first 2 seconds following power up, the D+/D- pins perform USB BC1.2, 5-V adapter detection, per the published spec, and then high voltage adapter (HVDDCP adapters = 9V, 12V) detection for many common HVDPC adapters.  The detection attempts to set the charger's input current limiting circuit no higher than the adapter can provide.  For USB adapters, the charger expects the host to perform USB enumeration as the final word on adapter output current = charger input current limit.  After detection, the D+/D- pins go high impedance so you can use them for other communication.  The default setting for detection at power up and for HVPDC detection is enabled but you can disable either or both detection via I2C.  The exact detection protocol (in other words the voltage or current at D+/D- pins) is not user configurable on the BQ25895 but the voltage levels are user configurable on the BQ25890H in QFN and the BQ25898 in WCSP.

    Regards,

    Jeff