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BQ51003 EPT Behavior different than BQ51013A

Bob Plott
Prodigy 230 points
Other Parts Discussed in Thread: BQ51013A, BQ51003, BQ51013B

I know this has been asked before but there has yet to be a response.

We were looking to use the BQ51003 in place of the BQ51013A in our design because it is characterized for the lower power of our system (~80mA). However, the behavior of the two differs in the packet sent out when the TS/CTRL pin is pulled high: (Packets monitored with Avid Tech Qi Sniffer v1.1)

The BQ51013A-EVM sends EPT - Charge Complete and the transmitter responds by setting LEDs to indicate this state. After a brief time a new power transfer cycle is attempted.

The BQ51003-EVM sends EPT - Unknown and the transmitter responds by setting the LEDs to fault mode. The transmitter waits for the receiver to be removed and replaced before attempting a new power cycle.

Why is there a difference? How do we send the Charge Complete packet?

The behavior is the same if the EN1 pin is pulled high rather than the TS/CTRL pin.

If we can't use the BQ51003, how do we return the two evaluation kits we ordered?

  • 0
    TI__Genius 14890 points

    Bob,

    My apologies for not answering the original post.

    The bq51013B and bq51003 datasheets have the incorrect information in Table 4 and will be updated shortly.  Taking TS/CTRL high or EN1 high (EN2 remaining low) will generate an EPT Unknown.  The bq51013A will generate EPT Charge Complete in the same situation. 

    For all three devices (bq51013A, bq51013B, bq51003) taking EN1=EN2=High will generate an EPT Charge Complete.

    Let me know if this works for your implementation.

    Regards,

    Dick

  • 0 in reply to Dick Stacey
    Prodigy 230 points

    Dick,

    Yes, this seems to work well, and is a bit easier to implement than the open drain FET approach. When can we expect an updated datasheet? :)

    -Bob