CCS Technical Documentation Engine module
Company confidential RH-18/36/38
Issue 1 10/03 Nokia Corporation. Page 19
Functional Description
Audio External
Nokia 1100 is designed to support fully differential external audio accessory connection.
A headset and PnPHF can be directly connected to system connector.
Figure 3: Headset Interface
Headset accessory uses 4-wire fully differential audio connection.
Audio Internal
Earpiece
The earpiece selected is a 13-mm dynamic earpiece with a nominal impedance of 32 Ω (.
The earpiece is placed within the mechanic parts, e.g. C-cover and Light guide. The holes
of the A-cover and the choice of dust shield are made in a way to have the best trans-
mission of the sound, without having much impact on the sound waves and sound qual-
ities.
The acoustic design involves a sandwich of five parts: Earmat, A-cover, C-cover, light-
guide- and D-cover.
On top of the lightguide there will be a metal frame (C-cover) that protects the earpiece.
The C-cover includes 5 acoustical holes and a double-sided gasket for sealing in the area
over the earpiece.
The front cover consists of two parts, an A-cover and an earmat with six acoustical holes,
2 direct front holes, and 4 leak holes.
1k0
Hookint
Headint
Headint
EAD
MICB2
MIC2P
MIC2N
33N
HFCM
HF
Bottom
Connector
UEM
2.1V
2.7V
33N
1k0
/MBUS
MicGnd
1.8V
0.3V
0.8V
3...25k
Mic_bias
0.8V
Not all components are shown
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