15
Beeper
The EM3296 provides a pin (Buzz, 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 or
good read. The PWM output is not strong enough to drive a beeper, thus a beeper driver circuit is needed.
The following beeper driver circuit is provided for reference.
2N3904
Q8
AS903Q
LS1
1
2
R5
10R
R6 1K
R7
10K
VDD
BUZZ
BAT760
D2
Содержание EM3296
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