Nokia Ringo2 Baseband Block
After Sales Technical Documentation
NHN–3N Series Transceivers
Chapter 1
Baseband Block
Original 42/96
NHN–3N
After Sales
Baseband Block
Technical Documentation
CONTENTS
Introduction 3 – 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
List of Sub–modules 3 – 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Modes of Operation 3 – 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Ratings ? where ?? 3 – 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DC Characteristics 3 – 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Connections 3 – 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Battery/Service Connector 3 – 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Charger Connector 3 – 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Audio Specifications ?? 3 – 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Circuit Description 3 – 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CTRLU 3 – 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CTRLU Internal Signals, Inputs 3 – 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CTRLU Internal Signals, Outputs 3 – 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Block description 3 – 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
RFTEMP, RF temperature measurement 3 – 13. . . . . . . . . . . . . . . . . . . . . .
Main components 3 – 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PWRU 3 – 17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Block description 3 – 17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
MUUMI Block diagram 3 – 20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
AUDIO 3 – 21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Introduction 3 – 21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Main features 3 – 21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Technical specifications 3 – 22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
NIPA Block Diagram 3 – 25. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Transmit (TX) audio signal path 3 – 26. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
UIF 3 – 29. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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Original 42/96
After Sales
NHN–3N
Technical Documentation
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 mountable. They are reflow soldered .
The connections to the Display–module are fed through a flex 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
circuit . 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 2 kbytes EEPROM memory is of serial I
type. The SIS–processor is a Motorola MC68HC11A8 connected to the
controller over serial bus I2C.
Baseband Block
2
C–bus
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
Original 42/96
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NHN–3N
After Sales
Baseband Block
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:
Technical Documentation
In the conversation mode all ICs are active.
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
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Original 42/96
After Sales
NHN–3N
Technical Documentation
Connections
Battery/Service Connector
Baseband Block
Pin Line
Symbol
1 VBAT 4.2V 4.8V 6.8V Battery voltage for transceiver.
2 MBUS Mbus line
3 XEAR External earphone
4 XMIC External microphone
5 GND Power supply ground.
Minimum
Typical
/ Nomi-
nal
Maxi-
mum
Minimum Typical /
Nominal
Maximum
Original 42/96
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NHN–3N
After Sales
Baseband Block
Charger Connector
Technical Documentation
Pin Line
Symbol
2 VCS
3 GND Power Supply Ground
4 TERMI-
NAL
Minimum
9.5V 10.5V 10.5V LCH–6 and ACH–6
10.5V 12.0V 16.5V ACH–8
Typical
/ Nomi-
nal
740mA
265mA
Maxi-
mum
Unit / Notes
Page 1 – 6
Original 42/96
After Sales
NHN–3N
Technical Documentation
Audio Specifications
Minimum Typical /
Nominal
Minimum Typical /
Nominal
MIC (NIPA’s input pin) 2,5 mV
EARP, EARM 35 mV
XEAR 170mV
XMIC 260mV
rms
rms
rms
rms
Baseband Block
Maximum Unit / Notes
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
Original 42/96
Page 1 – 7
NHN–3N
After Sales
Baseband Block
Technical Documentation
Circuit Description
CTRLU
The Control block controls all phone functions, and SIS–processor too.
CTRLU Internal Signals, Inputs
Signal Name Notes From
VL2 Logic supply voltage Max 40 mA PWRU
VL3 SIS processor supply voltage PWRU
VREF Reference voltage 3.3V 2%. Max. 5mA. PWRU
PWRON Signal from power button. PWRU
XRES Reset line from MUUMI PWRU
VCHARG Charger voltage to A/D converter PWRU
VBATSW Battery voltage to A/D converter. PWRU
BTEMP Battery temperature CTRLU
RFTEMP RF temperature SYNTHESIZER
RSSI Received signal strength indication RECEIVER
TXI Transmitter output power level indication TRANSMITTER
RXD Serial interface (M2BUS) PWRU
XINT Interrupt request from NIPA AUDIO
NMI No maskable Interrupt request from NIPA AUDIO
CLKMCU Clock for controller AUDIO
CTRLU Internal Signals, Outputs
Signal Name Notes To
TXD Serial interface (M2BUS) PWRU
CSW Charger control PWRU
AGC Gain control RECEIVER
RXE RX Circuit power on/off RECEIVER
SCLK Synchronous data clock for synthesizers SYNTHESIZER
SDAT Synchronous data for synthesizers SYNTHESIZER
SLE Synthesizer data latch enable SYNTHESIZER
TXE Transmitter control (on/off) TRANSMITTER
TXC Transmitter Power Control TRANSMITTER
TXS TX synthesizer enable SYNTHESIZER
EAREN Earphone enable AUDIO
XNCS NIPA chip select signal AUDIO
XNWR NIPA write control signal AUDIO
XNRD NIPA read control signal AUDIO
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After Sales
NHN–3N
Technical Documentation
NA(3:0) NIPA address bus AUDIO
ND(7:0) NIPA data bus AUDIO
LIGHTS Backlights on/off UIF
COL0/
XPWROFF
COL1–4 Lines for keyboard read (keypad outputs) UIF
ROW0–2 Lines for keyboard read (keypad inputs). Input pull–up used UIF
LCDD0–3 Lcd driver data UIF
E Lcd driver chip select signal UIF
RW Lcd driver read/write select signal UIF
RS Lcd driver register select signal UIF
LCDRES Lcd driver reset signal UIF
Line for keyboard read/
Power off control
Baseband Block
UIF
ToNotesSignal Name
Block description
CTRLU – PWRU
CTRLU controls the watchdog timer in MUUMI. It sends a positive pulse
at approximately 1 s intervals to the XPWROFF pin of MUUMI to keep the
power on. If CTRLU fails to deliver this pulse, the MUUMI will cut off power from the system. CTRLU also controls the charger on/off switching in
the PWRU block. When power off is requested, CTRLU leaves the
MUUMI watchdog without reset. After the watchdog has elapsed, MUUMI
cuts off the supply voltages from the phone. Battery charging is controlled
by CSW line, which is a PWM–controlled output port (frequency about 11
Hz).
VBATSW, Battery voltage measurement
The battery voltage can be measured up to 9.075 V nominal with 3.3 V
reference voltage. The absolute accuracy is low because of the reference
3 % accuracy, and A/D–converter +/– 8 LSB accuracy . This battery voltage measurement offset error must be calibrated with input voltage 4.8 V.
The A/D conversion result can be calculated from the equation:
A/D readout = 1024 * (VBATSW* ( 4/11)) / VREF VREF=3.3V
Original 42/96
For example:
6.9 V results 778 = 30AH
4.8 V results 542 = 21EH
4.0 V results 451 = 1C3H
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