Av Connector - Nokia RM-313 Service Manual

RM-313
System Module

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.
Signal
AUDIOCTRL(0),
AVPaEn
AUDIOCTRL(1),
AVPlugDet
AUDIOCTRL(2),
AVECICtrl
AUDIOCTRL(3),
AVVideoCtrl
AUDIOCTRL(4),
IHF_AMP_EN
Figure 52 Connector pin layout (Plug conductors from left to right HS EAR L, HS EAR R, HS MIC/Cntrl. and HS GND)
Issue 1
Table 13 AUDIOCTRL interface
Control
Headphone amplifier
Plug_det from AV-
connector
Mic2P / head_det
switch N2001
Mic2P / Comp_Video
switch N2002
Attenuation switches
N2030 and N2031, IHF
amp N2120
Figure 51 AV connector component layout and pads
COMPANY CONFIDENTIAL
Copyright © 2007 Nokia. All rights reserved.
Default state / action
0 (shutdown)
1.8V (VIO), grounded when 3.5mm plug
inserted
Default 0 (microphone line connected
to Mic2P). When 1, microphone line
connected to head_det -> ECI-detection
Default 0, (microphone line connected
to Mic2P). When 1, Composite Video
from APE connected to microphone
line.
Default 0, IHF amplifier and
attenuation not used.
Page 6 –23