SW_OPEN

ALARM

SCR

Fault Counter Reset

3

1

2

4

5

6

Debounce Time, td2

Debounce Time, td3

16

AFE3010

SBFS042 – JUNE 2020

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Application Information (continued)

8.1.2.1 No Self-Test Fail Event

If there is no self-test failure event, the ALARM is turned on without blinking when the SW_OPEN signal goes

from high to low. Figure 13 describes the sequence of events.

Figure 13. ALARM With SW_OPEN Transition to Low. No Self-Test Failure.

1. The SW_OPEN signal transitions from high to low.

2. After a debounce time to ensure there is no false transition, the device fires the SCR.

3. The internal fault counter resets.

4. The ALARM turns on.

5. The SW_OPEN signal transitions low to high.

6. After a debounce time to ensure there is no false transition, the ALARM turns off.