The device ALERT pin is an active-low, open-drain output that is designed to be pulled low when the input conditions are detected to be out-of-range. Add a 10-kΩ pullup resistor from ALERT pin to the supply voltage. This open-drain pin can be pulled up to a voltage beyond the V_S supply voltage, but must not exceed 5.5 V.

Figure 7-1 shows the alert output response of the internal comparator. When the output voltage of the amplifier is less than the voltage developed at the LIMIT pin, the comparator output is in the default high state. When the amplifier output voltage exceeds the threshold voltage set at the LIMIT pin, the comparator output becomes active and pulls low. This active low output indicates that the measured signal at the amplifier input has exceeded the programmed threshold level, indicating an overcurrent or out-of-range condition has occurred.

Figure 7-1 Overcurrent Alert Response