Nokia 9110 Service Manual
PAMS
Technical Documentation
RAE–2
Baseband
Page 2– 33
Original 02/99
limit, the MCU initiates a power down procedure and disconnects the SIM
power. Then the MCU outputs a system reset signal and resets the DSP.
If there is no charger connected, the MCU writes a short delay to CCONT
watchdog and resets itself. After the set delay the CCONT watchdog ex-
pires, which activates the PURX and all regulators are switched off and
the phone is powered down by the CCONT.
power. Then the MCU outputs a system reset signal and resets the DSP.
If there is no charger connected, the MCU writes a short delay to CCONT
watchdog and resets itself. After the set delay the CCONT watchdog ex-
pires, which activates the PURX and all regulators are switched off and
the phone is powered down by the CCONT.
If a charger is connected when the power key is pressed the phone en-
ters into the acting dead mode.
ters into the acting dead mode.
Watchdog
The Watchdog block inside the CCONT contains a watchdog counter and
some additional logic which are used for controlling the power on and
power off procedures of CCONT. Watchdog output is disabled when
WDDisX pin is tied low. The WD-counter runs during that time, though.
Watchdog counter is reset internally to 32s at power up. Normally it is re-
set by the MAD writing a control word to the WDReg.
some additional logic which are used for controlling the power on and
power off procedures of CCONT. Watchdog output is disabled when
WDDisX pin is tied low. The WD-counter runs during that time, though.
Watchdog counter is reset internally to 32s at power up. Normally it is re-
set by the MAD writing a control word to the WDReg.
Audio control
The audio control and processing is controlled by the COBBA–GJ ASIC,
which contains the audio and rf codecs, and the MAD2, which contains
the MCU, ASIC and DSP blocks handling and processing the audio sig-
nals. The RAE–2 audio block diagram is presented in the figure next
page.
which contains the audio and rf codecs, and the MAD2, which contains
the MCU, ASIC and DSP blocks handling and processing the audio sig-
nals. The RAE–2 audio block diagram is presented in the figure next
page.
MIC1
MIC3
MIC3
MIC2
AuxOut
HFCM
COBBA
Figure 20.
RAE–2 audio block diagram
BS8
BS1
HF–speaker
SCOTTY
Preamp Multipl.
Premult.
Amp
Multipl.
MIC
BOTTOM CONNECTOR
HF
Earphone
PCM BUS
Serial
IF
IF
MAD
Emc + Acc.
Interface
Interface
Bias+
EMC
EMC
DSP
encoding
decoding
decoding
VAD
echo cancel
equalization
equalization
XEAR
XMIC
SGND
HFena
MCU
LP
LP
Pre
A
D
D
A
Micbias
VCOBBA
amp
CCONT
EAD
HookDet
HeadDet
PWM
FET
Switch
Switch
Ear
The baseband supports three microphone inputs and two earphone out-
puts. The inputs can be taken from an internal microphone, a headset mi-
puts. The inputs can be taken from an internal microphone, a headset mi-