Chapter 2: Hardware Interface Description
January 1, 2006 Module Hardware Description 33
Alert Loudspeaker Port
The alert loudspeaker is the default G24 power-up ringer. It is used for, but not limited to,
sounding the G24 alerts, melodies, and rings. It is located at pins 63 and 65 on the G24 interface
connector, named ALRT_N and ALRT_P respectively.
It is designed with an internal amplifier supplied directly from VCC, which supplies 0.5W to the
audio device. It may also be used as a single-ended output referenced to the G24 analog ground.
Figure 2-21 shows the alert loudspeaker circuit and Table 2-9 gives the loudspeaker
specifications.
Figure 2-21: Differential Loudspeaker Circuit
Important: For safety regulations it is important to place series resistors on the alert output
lines, as illustrated in Figure 2-21. The resistors value should be R = 0
Ω at the
design stage, but may be changed to a different value during audio safety testing, in
case attenuation in the alert gain is required.
Figure 2-22: SIngle-ended Loudspeaker Circuit
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