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INA226-Q1: schmatic review

Sky Kao
Prodigy 80 points
Part Number: INA226-Q1

Tool/software:

Would you have any suggestions for modifications to the schematic?

  • 0
    TI__Mastermind 19495 points

    Hello Sky,

    Thank you for using the TI forum. Here are my comments for your schematic:

    1. It looks like all 3 devices have the same address, so if they are on the same I2C BUS then you won't be able to read from them individually. If they are on separate boards, then it won't be a problem. 
    2. I don't see the I2C pullup resistors, so I will assume they are on a different section of the schematic
    3. Only the schematic with UIC1302 shows the shunt resistor connection, so I can't review it for the others. However, it is fine on this one, so if the others are the same or similar then they would be fine also.

    Regards,

    Mitch

  • 0 in reply to Mitch M
    Prodigy 80 points

    Thank you for your response. The schematic has been updated as described below:

    Model: INA226-Q1, Shunt Resistor: 1mΩ,
    - UIC2619, Function: Exterior Lighting - Reverse Light Power (Lamp), Maximum Current: 0.33A
    - UIC2729, Function: Exterior Lighting - Rear Fog Light Power (Lamp), Maximum Current: 0.2A
    - UIC2730, Function: Exterior Lighting - CHMSL Power Supply (Lamp), Maximum Current: 1.8A

    We have also added 2.2K pull-up resistors to the I2C lines.

    Do we need to adjust the shunt resistor value? Are there any other suggestions?