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  • TI Thinks Resolved

BQ50002: BQ50002 and bq500511 Startup error

Part Number: BQ50002

Hello! I assembled the device based on the document SLVUAJ7. The device tries to start charging, then the red LED starts blinking, and then it glows constantly. Rled=24.9k.

If the resistor R18(0.02 ohm) is replaced by 0 ohm, then the charge is coming, but the LED does not signal overload. What could be wrong?

  • This is FOD warning and fault condition-- See data sheet Table 1 LED Control Option 1, Red LED will blink fast. Also see data sheet section on Foreign Object Detection.

    Best Regards,

    Bill Johns,  Applications Engineer

    Texas Instruments Inc

    Dallas, Texas

    Please click "This resolved my issue" button if this post answers your question.

  • In reply to Bill Johns:

    What does constant red light mean? Using resistors R23=200k; R22,R27=100k; R26=82k. Current consumption of the device is normal.
  • In reply to Dima Dima:

    FOD fault will be a flashing Red LED then solid Red LED.
    When you changed the current sense resistor it reduced the power TX thought it was sending to the RX.

    Try increasing the FOD threshold to max for now.

    Best Regards,

    Bill Johns,  Applications Engineer

    Texas Instruments Inc

    Dallas, Texas

    Please click "This resolved my issue" button if this post answers your question.

  • In reply to Bill Johns:

    I set the voltage at pin FOD_CAL equal to 2.5 V, the product works, but the red LED does not light up. Resistors R23, 27 did not change. How correctly to make calibration? (In the description I can not understand in any way)

  • In reply to Dima Dima:

    If your application does not need FOD detection it can be disabled by pulling FOD_THR, Pin 35 to 3.0V.

    To investigate the FOD performance you will need to used BQSTUDIO to read the "Calculated Parasitic Loss" value. See User'S Guide (SLUVAJ7) section 6.1.8 -- Software.

    Best Regards,

    Bill Johns,  Applications Engineer

    Texas Instruments Inc

    Dallas, Texas

    Please click "This resolved my issue" button if this post answers your question.

  • In reply to Bill Johns:

    Thank you!

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