User Guide

CCS Technical Documentation System Module
RH-10
Issue 1 09/2002 Nokia Corporation Confidential Page 23
Accessories Interface
When the MCU-SW receives a headset-interrupt, generated by the switch in the head-
set-connector, it will start the accessory-detection sequence.
At first it will measure the voltage at XMICP-pin (divided in half by two resistors) via EAD
AD-converter in CCONT. If it detects a voltage, it will start the sequence for the active
accessory detection.
If there is no active voltage detected at XMICP, AUXOUT-pin of COBBA_D is switched to
1.5V and the voltage at XMICP is measured again. The voltage at XMICP depends on the
impedance which is connected between XMICP and XMICN at the accessory end.
The following table illustrates accessory detection / external audio.
Charger IF
Introduction
The charger connection is implemented through the bottom connector. The DCT4 bottom
connector supports charging with both plug chargers and desktop stand chargers.
There are three signals for charging. Charger gnd pin is used for both desktop and for
plug chargers as well as charger voltage. PWM control line, which is needed for 3-wire
chargers, is connected directly to gnd in module PWB so the RH-10 engine doesn't pro-
vide any PWM control to chargers. Charging controlling is done inside the UEM by
switching the UEM internal charger switch on/off.
Connector
Line
symbol
Minimum Typical/Nominal Unit/Notes
Connector state HOOKDET
(MAD1 pin
C10)
HEAD-
SETINT
(MAD1 pin
B11)
Voltage at XMICP EAD-value Notes
No accessory connected
Headset HDC-5 with but-
ton not pressed
Headset HDC-5 with but-
ton pressed
PPH-1 (connected cor-
rectly)
PPH-1 with external
microphone (connected
correctly)
Audio box JBA-6
‘1’
‘1’
‘0’
‘0’
‘0’
‘1’
‘0’
‘1’
‘1’
‘1’
‘1’
‘1’
0V 0
1.1V 390
0.75V 255
2.6V 900
2.2V 750
-0.9V 330-350
When AUXOUT at
1.5V
When AUXOUT at
1.5V
When muted
When muted
When AUXOUT at
1.5V