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INA219: Datasheet Equations Clarification

Part Number: INA219

Hello

We are having issues with the suggested calibration equations, datasheet page 12:

  1. Can you please confirm full scale Vshunt range if PGA=/1. Page 5 suggests it is 40mW, but given the 10mV LSBit and 12bit output, shouldn't it be 40.96mV?

  2. Equation 2 is using a 2^15 divider, even though this is a 12b ADC part. Why not just use V_lsbit (10uV) / Rshunt to get the current_LSB?

  3. What is the 'Maximum Expected Current' in equation 2 supposed to be? Is it 40mV/Rshunt? Or the end application's full range target, even if it doesn't use up the whole 40mV range?

  4. Equation 1 seems to be calculating the number of steps that fit in the ADC's 40.96mV full range, is this correct?

Thank you,
Ryan B.