User's Manual

AnyDATA.NET Inc.

AnyTime AnyPlace Any Wireless Data Solution

AD-2001-06-28 Ver 1.1

-23-

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

Vdd

Ringer signal

From

the modem

0.01uF

Buzzer

Figure 4-4 Reference External Ringer Driver Circuit