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8.1.2 Loudspeaker (Ringer) and Microphone
Notes
Loudspeaker
(EPP1, EPN1, EPP2,
EPN2) and Microphone
(HF_MICRO,
MICN2,
MICP,
MICN) are connected directly to the Voiceband-Part of EGOLD+
Loudspeaker(Ringer)
Beside the normal Loudspeaker function the Loudspeaker is acting as a Ringer
controlled by the EGOLD+
The EGOLD+ ringer function is implemented as a special mode of operation of the
earpiece buffer EP1. In ringer mode the output of is connected to a specific
driver circuit which guarantees a definite slew rate of the ringer output signal. This
feature ensures that excessive load of power supply circuits and overshoots at the
ringer output pins due to inductive load are avoided.
V1.0
Page 33 of 38
ICM MP CC ST
A35-A36-A40
Company Confidential
09/01
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