Technical Information; Pph-1 Handsfree; Introduction; Interface - Nokia NKC-1X Series Technical Documentation Manual

NKC-1X
System Module
2.7V
Hookint
/MBUS
EAD
Headint Headint
MIC1Bias
MIC1P
MIC1N
HF
3...25k
HFCM
UEM

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.
Page 22
Figure 7: Accessory Detection / External Audio.
2k2
2.1V
33n
33n
0.8V
100p
Nokia Corporation
CCS Technical Documentation
1.8V
0.3V
MicGND
Issue 1 02/03