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INA226-Q1: The IC pulls its SDA line high occasionally when load is connected.

Abhijeet Abhijeet1
Prodigy 70 points
Part Number: INA226-Q1
Other Parts Discussed in Thread: INA226

Hey there 

We are using an INA226 for sensing current on the low side in a high side switching application as shown in the schematics below.
The issue here is that if we connect and disconnect a 9A resistive load a bunch of times the INA226 pulls its SDA line high and doesn't respond unless restarted.

  • 0
    TI__Mastermind 27380 points

    Hi,

    It seems the schematic didn’t come through, please attach again.

    Does “restarted” mean power down and up the entire board? Have you performed any test to show that it is only INA226 not responding, yet the controller or any other devices on the bus is working properly?

    Regards, Guang

  • 0 in reply to Guang Zhou
    Prodigy 70 points

    Hey there

    1) By restarted I mean powering on and off the Current sense amplifier.
    2) Yes only INA226 is not responding as if we perform the same connection and disconnection of load with INA226 disconnected from the I2C lines the SDA is not being pulled high and other ADC on the same Bus is performing fine.

    Regards 
    Abhijeet

  • 0 in reply to Abhijeet Abhijeet1
    TI__Mastermind 27380 points

    Hi Abhijeet,

    Under normal working conditions, INA226 doesn’t have the capability to pull SDA high. However it is hard to say in situations where it falls outside of its normal operating condition.

    Can you capture some scope plots to show:

    (1)   I2C waveform – INA226 not responding

    (2)   Transient pin voltage on “SENSE+” during load plug/unplug, especially the time right before INA226 locks up.

    Regards, Guang