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BQ500211: bq500211 How to implement FOD detection

Part Number: BQ500211
Other Parts Discussed in Thread: BQ500212A, MSP430G2001

Hi

My customer have some query with FOD.

1. Is power PPT calculated according to the values of V_SENSE and I_SENSE pins? The loss power ploss is obtained by subtracting the power PPR obtained at the receiving end. The loss power is not foreign within the specified range.

2. If the receiving end is foreign body, how to get the receiving power PPR?

Waiting for your reply

Thanks

Star

  • Hello Star

    Which device is customer using, could it possibly be BQ500211A?

    The BQ500212A would be a better device.

    "1. Is power PPT calculated according to the values of V_SENSE and I_SENSE pins? The loss power ploss is obtained by subtracting the power PPR obtained at the receiving end. The loss power is not foreign within the specified range."  --  Bill J -- Yes.  PPR represents  power sent to RX and the calculation also takes into account conversion loss inside the TX, not straight V_SENSE and I_SENSE.  This is part of TX FOD calibration.

    "2. If the receiving end is foreign body, how to get the receiving power PPR?"  --  Bill J -- If only a foreign body (no RX) the TX will not start, must communicate with RX.  If RX + Foreign body the RX will report how much power received (PPR).  Power missing will be high (PPT-PPR) and set a fault.

    PPR is set during RX FOD calibration, it is the voltage at FOD pin of TI RX.

  • Hi Bill

    Thanks for your reply.

    One more question, is it ok to use msp430g2001 in any kind of package? The requirements are not mentioned in the specification.

    Thanks

    Star

  • Hi Star

    Yes -- other package can be used.