User Guide

An analogue electret microphone is connected to the EM ASIC (N2200) Mic1P via asymmetric electrical

connection.

The microphone is biased by the EM ASIC MicB1 bias voltage output.

Figure 97 Internal microphone circuitry

External microphone

External micrphone is used in accessory mode.

Galvanic accessories are connected to the system connector.

External microphone uses EM ASIC (N2200) Mic2P and Mic2N inputs.

Accessory audio mode is automatically enabled/disabled during connection/disconnection of dedicated

phone accessories.

Figure 98 External microphone circuitry (system connector connects to right side)

Internal earpiece

The internal earpiece is used in the HandPortable (HP) call mode. A dynamic 7 x 11mm earpiece capsule is

connected directly to the EM ASIC (N2200) differential outputs EarP and EarN through the coax cable, top

block PWB and the flex.

External earpiece

All galvanic accessories are connected to the system connector.

The accessory audio mode is automatically enabled/disabled during connection/disconnection of dedicated

phone accessories.

RM-100

System Module Nokia Customer Care

Issue 2 COMPANY CONFIDENTIAL Page 10 –23