User Guide

Figure 101 Internal handsfree speakers (upper block)

Figure 102 Internal handsfree speaker amplifier circuitry

System connector

The system connector provides a fully differential 4–wire stereo line-level output connection and a fully

differential 2-wire mono line-level or microphone level input connection.

The handsfree driver in one of the EM ASICs is meant for the headset.

The output is driven in a fully differential mode. In the fully differential mode, the handsfree pin is the

negative output and the HFCM pin is the positive output. The gain of the handsfree driver in the differential

mode is 6 dB.

RM-100

Nokia Customer Care System Module

Page 10 –26 COMPANY CONFIDENTIAL Issue 2