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BQ24072: Design help

Marvin Gasis Arcangel
Expert 8940 points
Part Number: BQ24072

Hi Team,

I need advice in designing a LED indicator for the BQ24072:

The customer design requires to use two LED (Green and Blue) to indicate when the device is charging and when the charging is completed.

I checked the EVM schematic and the datasheet and it appears that the status indicator pins PGOOD and CHG can be used. 

The CHG pin is in High-impedance when the charge is complete, turning the led OFF, Is there a way to configure the circuit so that the LED lights up when charging is complete?

Thanks in advance.

Regards,

Marvin

  • 0
    TI__Expert 8245 points

    Hi Marvin,

    Let's assume you want the green LED to represent charging and the blue LED to represent charge complete.

    The green can be connected from CHG to OUT as shown in the simplified schematic in the datasheet.

    The implementation for the blue LED may be a bit more involved. You could theoretically connect the anode to OUT and then XNOR the CHG and PGOOD pins and connect the output of the XNOR to the cathode. Essentially you want the cathode pulled low when PGOOD is low and CHG is HIZ (device is on and not charging). An XNOR gate can accomplish this goal since there should never be a case when the device is off and charging (the other XNOR condition).

    Quick disclaimer however, we have not tested this implementation so I can not guarantee its functionality 100% but it is the best solution I can think of here.

    Thanks,

    Jackson