SBFS042 June 2020 AFE3010
The AFE3010 ALARM pin can be used to drive an LED or a buzzer. Under normal system operation the ALARM output remains low. During active operation, the ALARM signal generates a 3-KHz signal for the duration of positive half of the power cycle and remains low for the duration of the negative half power cycle. Figure 9 shows the ALARM signal scheme over a 60-Hz power line.