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AFE3010

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SBFS042 – JUNE 2020

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7.4.2 ALARM Modes to Drive LED

The AFE3010 supports three different modes when the ALARM pin is used as an LED driver:

1. Successful power-up indication: The LED turns on for 250-ms when the first periodic self-test is completed

after power up. On a 60-Hz system, this event occurs approximately one second after power up.

2. LED blinking due to self-test fail: In case of a self-test fail, the ALARM pin sets the LED in blinking mode a

frequency of 0.5-Hz. In this state, the LED is on for one second and off for one second. When the ALARM

pin goes into blinking mode, a system power recycle or a successful self-test pass through the PTT press will

deactivate the ALARM signal.

3. LED on through the SW_OPEN pin: If the SW_OPEN pin is low, the LED will turn on without 0.5-Hz blinking.

During a self-test fail event, the device overrides the SW_OPEN state and puts the LED blinking mode at 0.5

Hz.

Table 3. ALARM (LED) Operating Modes

AFE3010 STATUS

SW_OPEN PIN

ALARM (LED) FUNCTION

COMMENTS

Self-test fails

Floating

ALARM (LED) blinks

Self-test fail dominates ALARM (LED)

behavior and ignores the SW_OPEN

signal

Low

Load switch open due

to H-G or N-G fault

Floating

ALARM (LED) remains off

Low

ALARM (LED) remains on without blinking

At power up, during the

first self-test only

Floating

ALARM (LED) on for 0.25 s after first self-

test pass

Indicates the event of first self-test

pass after power up

Low

ALARM (LED) on without blinking