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Beeper
The EM3090 provides a pin (BUZ, PIN 9) on the host interface connector that provides a PWM output to
an external driver circuit for generating audible feedback to the user to indicate statuses like power up,
good read or operation error. The PWM output is not strong enough to drive a beeper, so a beeper driver
circuit is needed.
The following beeper driver circuit is provided for reference.
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