Nokia 234 Baseband Block
After Sales Technical Documentation
NHN–4N Series Transceivers
Chapter 3
Baseband Block
Original 06/99
NHN–4N
PAMS
Baseband Block
Amendment
Number
Date Inserted By Comments
06/99
Technical Documentation
AMENDMENT RECORD SHEET
Page – 2
Original 06/99
PAMS
NHN–4N
Technical Documentation
Baseband Block
CONTENTS
Introduction – 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
List of Sub–modules – 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Modes of Operation – 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DC Characteristics – 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Connections – 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Battery/Service Connector – 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Charger Connector – 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Audio Specifications – 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Circuit Description – 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CTRLU – 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CTRLU Internal Signals, Inputs – 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CTRLU Internal Signals, Outputs – 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Block description – 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
RFTEMP, RF temperature measurement – 12. . . . . . . . . . . . . . . . . . . . . .
Main components – 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PWRU – 16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Block description – 16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
MUUMI pins – 18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
AUDIO – 19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Main features – 19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Technical specifications – 20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Transmit (TX) audio signal path – 23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
UIF – 26. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Original 06/99
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NHN–4N
PAMS
Baseband Block
Introduction
The baseband submodule controls the internal operation of the phone. It
controls the user interface, i.e. LCD driver, keyboard, and audio interface
functions. The module performs all signalling towards the system, and
carries out audio–frequency signal processing. In addition, it controls the
operation of the transceiver and stores tuning data for the phone.
All functional blocks of the baseband are mounted on a single multi layer
printed circuit board. This board also contains RF–parts. The chassis of
the radio unit contains separating walls for baseband and RF. All components of the baseband are surface mounted and reflow soldered. The
connections to the Display–module are fed through a flexible foil to the
board connector.
The Baseband Module includes power supply, modem, audio filters, micro–controller, nonvolatile memory, SIS–processor and keyboard. The
display is a separate module. Power supply circuits like regulators, voltage detection and charging control, are integrated to the custom MUUMI
IC . The modem and audio operations are integrated into NIPA ASIC. The
micro–controller is a Hitachi H8 series controller with 64 kbytes ROM and
2 kbytes RAM. The 8 kbyte EEPROM memory is of serial I
The SIS–processor is a Motorola MC68HC11A8 connected to the controller over serial bus I2C.
Technical Documentation
2
C–bus type.
List of Sub–modules
Name of submodule Notes
CTRLU
PWRU
AUDIO
UIF
RECEIVER
TRANSMITTER
SYNTHESIZER
These blocks are only functional blocks and therefore have no type nor
material codes.
Control Unit for the phone
Power supply
Audio
User interface
Receiver
Transmitter
Synthesizer
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NHN–4N
Technical Documentation
Modes of Operation
The module has three operating modes: stand–by, listening, and conversation mode.
Standby mode:
CPU‘s clock is switched off, only NIPA timer is running to take care of battery save timings.
If charger is connected CPU doesn‘t go to standby mode.
Listening mode:
In the listening mode, some blocks of the audio IC (NIPA) are in standby
state.
Conversation mode:
In the conversation mode all ICs are active.
Baseband Block
DC Characteristics
Line Symbol Minimum Typical /
Nominal
VCS
VCS
VBA T 4.5V 4.8V 6.8V
VRF 4.5V 4.8V 6.8V VBAT for RF module
VA 3.1V 3.3V 3.5V Imax = 20mA
VL 3.1V 3.3V 3.5V Imax = 0.5mA
VL2 3.1V 3.3V 3.5V Imax = 40mA
VL3 3.6V 3.9V 4.3V Imax = 20mA
VREF 3.2V 3.3V 3.42V Imax = 5mA
9.5V 10.5V 10.5V LCH–6; ACH–6
740mA
10.5V 12.0V 16.5V ACH–8
265mA
Maximum Unit / Notes
Original 06/99
Page – 5
NHN–4N
PAMS
Baseband Block
Connections
Battery/Service Connector
Technical Documentation
Pin Line
Symbol
1 VBAT 4.2 4.8 6.8 V
2 MBUS Mbus line
3 XEAR 170 mVrms; External earphone
4 XMIC 270 mVrms; External microphone
5 GND Ground
Minimum
Typical
/ Nomi-
nal
Maxi-
mum
Unit / Notes
Xmic, Xear and Mbus lines are used only in service mode.
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NHN–4N
Technical Documentation
Charger Connector
3.8mm DC–Jack for ACH–6, LCH–6 and ACH–8.
Pin Line
Symbol
2 VCS
3 GND
4 TERMI-
NAL
Minimum
9.5V 10.5V 10.5V LCH–6 and ACH–6
10.5V 12.0V 16.5V ACH–8
Charger Connector is described in the figure below.
Typical
/ Nomi-
nal
800mA
300mA
Maxi-
mum
Baseband Block
Unit / Notes
Original 06/99
S0001227
Page – 7
NHN–4N
PAMS
Baseband Block
Audio Specifications
Minimum Typical /
Nominal
MIC (NIPA’s input pin) 2,5 mV
EARP, EARM 35 mV
XEAR 170mV
XMIC 260mV
rms
rms
rms
rms
Technical Documentation
Maximum Unit / Notes
30 mV
rms
3.0 V
rms
2600mV
rms
Mic amplifier input
(NIPA’s input pin)
Earphone amplifier
output
Via Battery / Service
Connector
Via Battery / Service
Connector
Page – 8
Original 06/99
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