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BQ25890: question about HVDCP and handshake

Kai Nomiyama
Expert 5555 points
Part Number: BQ25890

Hi Team,

My customer is evaluating bq25890/2 and I got following questions so could you help?

Question 1
are there any way to disable "USB BC1.2 Detection → Ajustable High Voltage Adapter Handshake" flow by Hardware?

Question 2
could you share HVDCP_EN detail?

Table 11. REG02 shows HVDCP_EN.
DCP voltage range is 5.25V from below USB DCP specification so we want to know the detail about this HVDCP handshake.
- is there any explanation in DCP specification?
- what voltage is HVDCP?
- when/what event is this handshake enabled?
someting like that...

Regards,
Kai

  • 0
    TI__Guru 57541 points

    Kai,

    1. It can't be disabled by hardware, but it will not be triggered if HVDCP handshake is not initiated.

    2. To achieve fast charging, high voltage (9V/12V) adapter with USB compatibility (5V) is required. TI refers such adapters as HVDCP (High Voltage Dedicated Charging Port) in general including MaxCharge™. Several companies also have proprietary handshakes to achieve this goal. The HVDCP handshake connects combinations of voltage source(s) and/or current sink on D+/D- to signal input source to raise output voltage from 5 V to 9 V / 12 V.

    Similar to BQ25890, BQ25890H in addition provides independent controlled voltage output drivers on D+ and D- pins to interface or emulate non-standard adapters when input source is plugged-in or OTG mode is enabled. Please refer to http://www.ti.com/tool/TIDA-03029 for BQ25890H reference design.

    Thanks,

    Ning.