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INA226: INA226 Technical consultation

Jack Su1
Intellectual 300 points

Part Number: INA226

Before the ina226 circuit is connected, the sleep current on the module is 60ua. After the circuit is connected, the power consumption of the whole circuit becomes 70ua. Is it because the ina226 monitoring current circuit consumes 10uA?

  • 0
    TI__Mastermind 26335 points

    Hello Jack,

    Thanks for considering to use Texas Instruments.  If the device is in shut down mode, it should not be measuring current.  One possible explanation for the increase in current through the supply pin could be attributed to a change in ambient temperature (illustrated in figure 16 of the datasheet) which will likely increase with all the surrounding circuitry powered up. Another possible explanation, if the extra 10uA you are seeing is through the sense pins, is that the front end common mode detection circuit, which allows the common mode to be higher than the supply voltage, pulls more current as the common mode rises above the supply voltage.  You can see this behavior in figure 12 of the datasheet.

  • 0
    Intellectual 300 points

    Hello Patrick Simmons：

    Figure 12 means, in continuous or triggered mode, the relationship between the current and voltage consumed by in + and in -?

    Our usage here is that in + is connected to 5V, in - is connected to load, vs is 3.3V, using trigged mode, is there an additional current consumption of 20ua in theory at this time?

    thank you

  • 0 in reply to Jack Su1
    TI__Mastermind 26335 points

    Hello Jack,

    Yes, figure 12 show the current sunk into pins IN+ and IN- for a supply of 5V when the common mode voltage is swept.  Here we can see that when the common mode voltage is greater than the supply (5V), the current consumed through these pins is about 20uA.  For the situation in which your common mode is 5V while your device supply is 3.3V, I would expect a similar amount of current to pass through these input pins.