8.33ms

8.33ms

ALA RM/ LED Pulsing at 3KHz

ALA RM/ LED Low

10

AFE3010

SBFS042 – JUNE 2020

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Figure 9. AFE3010 ALARM Signal Active Mode Definition (Time Calculation Shown for a 60-Hz Power

Line)

7.3.5 Phase Detection

The AFE3010 monitors power line signal phase at any given time through the PH and SCR_TST pins. Both pins

are clamped to VDD through internal clamping diodes. The PH pin is connected directly to the HOT power line.

This enables the device to monitor the power signal instantaneously. Phase measurement is critical for faster

and accurate response to system fault conditions. The SCR_TST pin measures the phase after the rectifying

diode.

7.3.6 SCR Control

The AFE3010 triggers an external SCR through the device SCR pin during a load fault event or self-test fail

event. This SCR trigger event activates a solenoid to trip the load switch disconnecting the load.