NKC-1X
System Module
CCS Technical Documentation
Page 22
Nokia Corporation
Issue 1 02/03
Figure 7: Accessory Detection / External Audio.
Technical Information
ESD protection is made up by (1) spark caps, (2) a buried capacitor (Z152 and Z154-157)
and (3)
±
8kV inside the UEM. The RF and BB noises are prevented by inductors.
PPH-1 Handsfree
Introduction
The PPH-1 handsfree device
• provides the charging and handsfree functionality
• has a built-in speaker
• and uses a phone microphone, but also has a connector for the HFM-8 optional
external microphone (using HFM-8 mutes phone microphone)
Interface
A 4-wire interface is implemented with 2.5mm diameter round plug/jack which is other-
wise like a so-called standard stereo plug, but the innermost contact is split into two.
2k2
Hookint
Headint
Headint
EAD
MIC1Bias
MIC1P
MIC1N
33n
HFCM
HF
UEM
2.1V
2.7V
33n
/MBUS
MicGND
1.8V
0.3V
0.8V
3...25k
100p
Summary of Contents for NKC-1X Series
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