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INA231: Can ALERT pins be connected from two or more INA231 in same design

Matt Mottier
Prodigy 190 points
Part Number: INA231

For a design that has two or more INA231 devices, can the ALERT pin share the same GPIO into microprocessor, assuming the ALERT is configured for normally active low and has a common pull-up resistor?

  • 0
    TI__Mastermind 21720 points

    Hello 6319281,

    Thank you for considering to use Texas Instruments.  The INA231 ALERT pin is connected to the drain of a mosfet.  When the device is powered and the alert is not triggered, the gate voltage is below the threshold voltage, thereby making the path from ALERT to device GND look like a very large resistor.  As such, having the INA231 ALERT pin share a common pull-up with other INA231s should not damage the device.  The device that is triggered will pull low and the majority of current will flow from the pull-up through the triggered device.  As long as the pull-up is sized such that no more than 5mA enter the ALERT pin, the device will be fine.  The only problem I see with a shared pull-up would be quickly determining which device was triggered.  If all devices are sharing the same pull-up and gpio, you would need to read from each device until you find the one that had been triggered.