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BQ24610: LED indicating circuit

user6555887
Prodigy 230 points
Part Number: BQ24610


Dear sir:

   If bq24610 VREF is short circuited with VCC, can bq24610 work normally when AC adapter is connected? Can it charge battery normally? Can it supply power to VSYS?

In my opinion, this design is unreasonable.

This part of the circuit LED indicates whether the vsys is powered by AC adapter or battery.If it is used for the design of sweeping robot, can this part of the circuit be deleted?

If it is not deleted, can the following modifications be made.

Thank you very much！

  Ellie

  • 0
    TI__Mastermind 41745 points

    Dear Ellie,

    VREF is a 3.3-V regulated voltage output and cannot be shorted to VCC. In fact, the Absolute Maximum Rating for the VREF pin is 3.6 V.

    Your LED circuit with D10 and D11 is used to give LED output of the status of ACDRV and BATDRV. Having them or not having them is entirely up to your system needs.

    If you do want to use it, please make sure the lower NMOS get enough voltage to turn them on. We use two 100 kOhm for divider in our EVM but the design presented uses 10 kOhm and 100 kOhm for the divider. This makes the NMOS drive voltage 1/11th of the VCC voltage instead of 1/2 of the VCC voltage.

    In addition, if you want to use the circuit please make sure that the resistors in line with the diode are rated for the input voltage and the current through them.

    Thanks,

    Mike Emanuel

    Please click "Resolved" if this answered your question.

  • 0 in reply to Michael Emanuel35
    Prodigy 230 points

    Dear Mike:

      Thank you for your reply. The above question has been understood. Another question to ask is  the PG pin indicates whether the VCC is within the valid range (not in UVLO or acov or sleep mode). When bq24610evm D5 is on, it means that the IC VCC input is valid, and it does not mean that bq24610 can work normally. Is this correct? If D4 is on, it means that the AC adapter is connected OK and the acdrv output is OK. Under which circumstances may D4 be on and D5 be off?

      Thank you very much!

  • 0 in reply to user6555887
    TI__Mastermind 41745 points

    Dear Ellie,

    Someone will get back to you by next week.

    Thanks,

    Mike Emanuel

  • +1 in reply to Michael Emanuel35
    TI__Mastermind 24075 points

    Hi,

       The functionality of the 2 LED are similar. PG and ACDRV logic are active at the same time with valid VCC