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INA230: request schematic review

Part Number: INA230


Would you review below schematic whether there's any wrong point?

Question > Should we have to connect the +12V_IN to the BUS (pin 11)?



  • Hello TS Yang,

    Thanks for choosing TI. You do not need R1506 and R1507. A0, A1 pins can connect directly to ground. If you don't already have them, I would add pull-up resistors to your SDA and SCL channels. Connecting the BUS pin is not necessary, but if you want to measure the power to your load and the shunt resistor (R1607) are dissapating, then yes, you should connect the BUS pin to the +12V_IN.

    Best regards,
    Peter Iliya
    Current Sensing Applications

  • In reply to Peter Iliya:

    Hello Peter Iliya,
    thanks for your quick answer.
    As for your comment "to measure the power your load", it means 12V Voltage Monitoring (voltage value measurement) ?
    The purpose of this chip is to know the voltage value of + 12V.
    If so, I want to know if the BUS signal should be connected to + 12V_IN.

  • In reply to Peter Iliya:

    Hi Peter,
    Can you share more information about your saying "to measure the power your load" ?
    should I connect the BUS signal to +12V for input voltage monitoring?

  • In reply to TS Yang:

    Hey TS,

    The VBUS pin will take voltage measurements where you connect it. If you connect VBUS to "+12V_IN" node, then the VBUS pin will record the bus voltage and store in the bus voltage register (02h). If you connect VBUS to "12V" node ( I assume this is the load side of shunt resistor R1607), then VBUS will measure 12V minus VR1607. In other words, it will measure your bus voltage minus the voltage drop across R1607.

    The INA230 calculates the power by multiplying VBUS and the current, thus if VBUS is connected to "+12V_IN" then the power you are calculating will include power delivered to your load and power dissapated across R1607. This might seem negligble, but I thought would note the difference. Overall, it is up to you and your design requirements on which side to connect VBUS pin. Thanks for choosing TI.

    Peter Iliya
    Current Sensing Solutions