External Audio Connector - Nokia RM-305 Service Manual

RM-305; RM-306
System module
Figure 81 Audio block diagram
The audio control is taken care of by UEMCLite, which contains the MCU and audio codec. Input and output
selection, and gain control is performed inside UEMCLite. DTMF-tones and other audio tones are generated
and encoded by UPP and transmitted to UEMCLite for decoding.
The vibra has is driven by PWM signal, generating vibration by rotating an un-balanced mass (counter
weight). The vibration signal is for example used as a silent alert call.

External audio connector

The system connector, containing a 4-pole Jack plug, gains the access to the external audio interface. The
Jack plug, which is integrated in the system connector, contains a mechanical switch, which is used to detect
the connection of the accessories. The configuration for the 4-pole Jack-plug is shown in the following figure.
Issue 2 COMPANY CONFIDENTIAL Page 6 –7
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