User Guide

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AV connector

The device has a 3.5mm AV-connector. The user can use it to connect any audio accessory or e.g. TV-out cable

to the phone. In-box headset (HS-43) is so-called Enhancement Control Interface (ECI) accessory. If the

connected cable is not ECI accessory, cable recognizing is based on impedance on the microphone line. If the

cable cannot be recognized, the user can select which accessory type is connected to the phone.

There are five Audio Control lines from Cellular Modem ASIC D2800 to control control audio and AV-connector

related electronics. Those signals and default stages of the signals are described in the following table.

Table 13 AUDIOCTRL interface

Signal Control Default state / action

AUDIOCTRL(0),

AVPaEn

Headphone amplifier 0 (shutdown)

AUDIOCTRL(1),

AVPlugDet

Plug_det from AV-

connector

1.8V (VIO), grounded when 3.5mm plug

inserted

AUDIOCTRL(2),

AVECICtrl

Mic2P / head_det

switch N2001

Default 0 (microphone line connected

to Mic2P). When 1, microphone line

connected to head_det -> ECI-detection

AUDIOCTRL(3),

AVVideoCtrl

Mic2P / Comp_Video

switch N2002

Default 0, (microphone line connected

to Mic2P). When 1, Composite Video

from APE connected to microphone

line.

AUDIOCTRL(4),

IHF_AMP_EN

Attenuation switches

N2030 and N2031, IHF

amp N2120

Default 0, IHF amplifier and

attenuation not used.

Figure 51 AV connector component layout and pads

Figure 52 Connector pin layout (Plug conductors from left to right HS EAR L, HS EAR R, HS MIC/Cntrl. and HS GND)

RM-313

System Module

Issue 1 COMPANY CONFIDENTIAL Page 6 –23