16
In
teg
ra
tio
n
Gu
id
e
In
teg
ra
tio
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Gu
id
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Beeper
The RT211 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.
D
2
B
A
T
7
6
0
