User's Manual

AnyDATA.NET Inc. AnyTime AnyPlace Any Wireless Data Solution
TM
4.7.3 Ringer
The Ringer pin provides the output to drive the sound transducer on the host. It alerts the user of a
voice call event and outputs key tones if the keypad is connected.
The reference external driver circuit is shown below:
4.7ohm
10Kohm
2.2Kohm
4.7Kohm
4.7Kohm
Q1
Q2
D1
Vdd
Ringer signal
From
the modem
0.01uF
Buzzer
Figure 4-4 Reference External Ringer Driver Circuit
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AD-2001-06-28 Ver 1.1
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