Nokia 5130 System Module 03

PAMS Technical Documentation

NSK–1 Series Transceivers

Chapter 3

System Module

Original 05/98

NSK–1

PAMS

System Module

CONTENTS

Transceiver NSK–1 3 – 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Introduction 3 – 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Functional Description 3 – 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Interconnection Diagram 3 – 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

System Module 3 – 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

External and Internal Connectors 3 – 7. . . . . . . . . . . . . . . . . . . . .

System Connector Signals 3 – 8. . . . . . . . . . . . . . . . . . . . . . . .

RF–Connector 3 – 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Battery Contacts 3 – 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SIM Reader 3 – 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Operating Conditions 3 – 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Functional Description 3 – 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Modes of Operation 3 – 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Cellular Mode 3 – 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Power off 3 – 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Locals Mode 3 – 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Baseband Module 3 – 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Block Diagram 3 – 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Power Distribution Diagram 3 – 13. . . . . . . . . . . . . . . . . . . . . . . . . .

External interfaces 3 – 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Flash Programming connector 3 – 14. . . . . . . . . . . . . . . . . . . . . . .

Battery connector 3 – 15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SIM card connector 3 – 15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Real time clock 3 – 16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Signals between baseband and User Interface section 3 – 16. .

User Interface module connection 3 – 16. . . . . . . . . . . . . . . . . . . .

Earphone 3 – 16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Buzzer 3 – 16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Power Distribution 3 – 17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Power up 3 – 19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Acting Dead 3 – 19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Active Mode 3 – 19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Sleep Mode 3 – 20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Charging 3 – 20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2–wire charging 3 – 20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3–wire charging 3 – 20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Power Off 3 – 21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Audio control 3 – 21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Microphone and Earphone 3 – 21. . . . . . . . . . . . . . . . . . . . . . . . . .

Speech processing 3 – 22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Alert Signal Generation 3 – 22. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Digital control 3 – 23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

MAD 3 – 23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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Memories 3 – 24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Program Memory 3 – 24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SRAM Memory 3 – 25. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

EEPROM Memory 3 – 25. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

MCU Memory Map 3 – 25. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Baseband EMC Strategy 3 – 26. . . . . . . . . . . . . . . . . . . . . . . . . . . .

RF Module 3 – 27. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

RF Frequency Plan 3 – 27. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

DC Characteristics 3 – 27. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Power Distribution Diagram 3 – 27. . . . . . . . . . . . . . . . . . . . . . . . . .

Power Distribution – Maximum Currents 3 – 28. . . . . . . . . . . . . . .

Power Distribution – Typical Currents 3 – 29. . . . . . . . . . . . . . . . .

Functional Description 3 – 30. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Receiver 3 – 31. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Transmitter 3 – 32. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Power Detection Circuit 3 – 33. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Frequency Synthesizers 3 – 35. . . . . . . . . . . . . . . . . . . . . . . . . . . .

AGC 3 – 36. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

AFC 3 – 37. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Software Compensations 3 – 37. . . . . . . . . . . . . . . . . . . . . . . . . . . .

Power Levels (TXC) vs. Channel 3 – 37. . . . . . . . . . . . . . . . . . .

Modulator Output Level 3 – 37. . . . . . . . . . . . . . . . . . . . . . . . . . .

Power Levels vs temperature 3 – 37. . . . . . . . . . . . . . . . . . . . . .

RSSI 3 – 37. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

TX power range 3 – 37. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

RF Block Specifications 3 – 38. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

DCS1800 Receive Interstage Filter 3 – 38. . . . . . . . . . . . . . . . . . .

First Mixer (UHF) in CRFU2a 3 – 38. . . . . . . . . . . . . . . . . . . . . . . .

First IF Filter 3 – 39. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

DCS1800 TX SAW filter 3 – 39. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

DCS1800 TX Ceramic Filter 3 – 39. . . . . . . . . . . . . . . . . . . . . . . . .

Power Amplifier MMIC 3 – 39. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

VHF VCO and Lowpass Filter 3 – 39. . . . . . . . . . . . . . . . . . . . . . . .

UHF PLL 3 – 40. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

DCS1800 UHF VCO module 3 – 40. . . . . . . . . . . . . . . . . . . . . . . . .

UHF LO signal into CRFU_2a 3 – 40. . . . . . . . . . . . . . . . . . . . . . . .

Connections 3 – 41. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

RF connector and antenna switch 3 – 41. . . . . . . . . . . . . . . . . . . .

RF–Baseband signals 3 – 41. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Data Interface and Timing 3 – 46. . . . . . . . . . . . . . . . . . . . . . . . . . .

Synthesizer Timing Control 3 – 46. . . . . . . . . . . . . . . . . . . . . . . . . .

Transmit Power Timing 3 – 48. . . . . . . . . . . . . . . . . . . . . . . . . . .

System Module

Parts list of UR9F Europe (EDMS Issue 4.6) Code: 0201184 3 – 49.
Parts list of UR9S APAC (EDMS Issue 6.6) Code: 0201089 3 – 58. .

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Schematic Diagrams: UR9F
Block Diagram of Baseband Blocks (Version 24 Edit 204) layout 24 3/A3F–1

Block Diagram of System/RF Blocks 3/A3F–2. . . . . . . . . . . . . . . . . . . . . .

Circuit Diagram of Power Supply (Version 24 Edit 354) layout 24 3/A3F–3
Circuit Diagram of UI Connector (Version 24 Edit 88) for layout 24 3/A3F–4
Circuit Diagram of CTRLU Block (Version 24 Edit 234) for layout 24 3/A3F–5
Circuit Diagram of Audio (Version 24 Edit 158) for layout version 24 3/A3F–6
Circuit Diagram of RF–BB Interface (Version 24 Edit 114) layout 24 3/A3F–7
Circuit Diagram of RF Block (Version 24 Edit 469) for layout 24 3/A3F–8

Layout Diagram of UR9F (Layout version 24) 3/A3F–9. . . . . . . . . . . . . .

Schematic Diagrams: UR9S

Technical Documentation

Block Diagram of Baseband Blocks (Version 24 Edit 204) layout 24 3/A3F–1

Block Diagram of System/RF Blocks 3/A3F–2. . . . . . . . . . . . . . . . . . . . . .

Circuit Diagram of Power Supply (Version 24 Edit 354) for layout 24 3/A3F–3
Circuit Diagram of UI Connector (Version 24 Edit 88) for layout 24 3/A3F–4
Circuit Diagram of CTRLU Block (Version 24 Edit 234) for layout 24 3/A3F–5
Circuit Diagram of Audio (Version 24 Edit 158) for layout version 24 3/A3F–6
Circuit Diagram of RF–BB Interface (Version 24 Edit 114) layout 24 3/A3F–7
Circuit Diagram of RF Block (Version 24 Edit 469) for layout 24 3/A3F–8

Layout Diagram of UR9S (Layout version 24) 3/A3F–9. . . . . . . . . . . . . .

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Transceiver NSK–1

Introduction

The NSK–1 is a radio transceiver unit for the PCN (GSM1800) network. It
is a GSM phase 2 power class 1 transceiver providing 16 power levels
with a maximum output power of 1 W. The transceiver is true 3 V trans­ceiver.

The transceiver consists of System/RF module ( UR9F/S ), User interface
module ( UE4S ) and assembly parts.

The antenna is a fixed helix. External antenna connection is provided by
rear RF connector

The small SIM ( Subscriber Identity Module ) card is located inside the
phone, under the battery pack.

System Module

Functional Description

There are five different operation modes:
– power off mode
– idle mode
– active mode
– charge mode
– local mode

In the power off mode only the circuits needed for power up are supplied.
In the idle mode circuits are powered down and only sleep clock is run-

ning.
In the active mode all the circuits are supplied with power although some

parts might be in the idle state part of the time.
The charge mode is effective in parallel with all previous modes. The

charge mode itself consists of two different states, i.e. the charge and the
maintenance mode.

The local mode is used for alignment and testing.

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Interconnection Diagram

10 9

Technical Documentation

Keypad Display

User Interface

Module

UE4S

28

6

SIM Battery

2

Earpiece

4

Engine

Antenna

Module

1

UR9S/UR9F

2

2

Mic

Connector

System

Connector

Charger

RF

3+36

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System Module

External and Internal Connectors

B side view

Fixing pads (2 pcs)

System Module

IBI connector

(6 pads)

8

1

7

14

Engine PCB

A side view

DC Jack

acoustic ports

Charger pads (3 pcs)

Microphone

Bottom

connector (6 pads)

Cable locking holes (3 pcs)

Cavity for microphone

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System Connector Signals

Pin Name Function Description

1 V_IN Bottom charger contacts Charging voltage.
2 L_GND DC Jack Logic and charging ground.
3 V_IN DC Jack Charging voltage.
4 CHRG_CTRL DC Jack Charger control.
5 CHRG_CTRL Bottom charger contacts Charger control.
6 MICP Microphone Microphone signal, positive node.
7 MICN Microphone Microphone signal, negative node.
8 XMIC Bottom & IBI connectors Analog audio input.

9 SGND Bottom & IBI connectors Audio signal ground.
10 XEAR Bottom & IBI connectors Analog audio output.
11 MBUS Bottom & IBI connectors Bidirectional serial bus.
12 FBUS_RX Bottom & IBI connectors Serial data in.
13 FBUS_TX Bottom & IBI connectors Serial data out.
14 L_GND Bottom charger contacts Logic and charging ground.

RF–Connector

The RF–connector is needed to utilize the external antenna with Car
Cradle. The RF–connector is located on the back side of the transceiver
on the top section. The connector is plug type connector with special me­chanical switching.

Accessory side of connector
Part will be floating in

car holder

Phone side of connector

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Battery Contacts

Pin Name Function Description

1 BVOLT Battery voltage Battery voltage
2 BSI Battery Size Indicator Input voltage

3 BTEMP Battery temperature indication

Phone power up
Battery power up
PWM to VIBRA BA TTERY

4 BGND Ground

Input voltage
Input voltage
Output voltage
PWM output signal frequency

SIM Reader

System Module

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Operating Conditions

Environmental condition Ambient temperature Notes

Normal operation conditions +7 oC ... +40 oC Specifications fulfilled and fast

charging possible
Extreme operation conditions –10 oC ... +55 oC Specifications fulfilled
Reduced performance condi-

tions
Intermittent operation condi-

tions

Cessation of operation <–25 oC and >80 oC No storage or operation at-

Long term storage conditions 0 oC ... +40 oC Battery only up to +30 oC !
Short term storage, max. 96 h –25 oC ... +70 oC Cumulative for life–time of bat-

Short term storage, max. 12 h –25 oC ... +80 oC Cumulative for life–time of bat-

–25 oC ... +75 oC LCD operation

+55 oC ... +65 oC Operational only for short peri-

ods

–25 oC ... –10 oC and
+65

o

C ... +80 oC

Operation maybe not possible

but attempt to operate will

not damage the phone

tempt possible without per-

manent dam– age

tery

tery

Short term operation > +70 oC Maximum value for SIM card,

GSM spec. 11.11

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Functional Description

The DCS 1800 engine consist of a Baseband/RF module with connec­tions to a separate user interface module. Baseband and RF modules
are interconnected with PCB wiring. The engine can be connected to ac­cessories via the bottom system connector, the Intelligent Battery Inter­face (IBI) connector.

The RF submodule receives and demodulates radio frequency signals
from the base station and transmits modulated RF signals to the base
station. It consists of functional submodules Receiver, Frequency Syn­thesizer and Transmitter.

The Baseband module containes audio, control, signal processing and
power supply functions. It consists of functional submodules CTRLU
(Control Unit; MCU, DSP, logic and memories), PWRU (Power Supply;
regulators and charging) and AUDIO_RF (audio coding, RF–BB inter­face).

System Module

Modes of Operation

UR4 operates in cellular mode and a local mode for service:
– Cellular mode, phone controlled by OS and partly by basestation
– Locals mode, used by Production and After Sales.
– Acting Dead mode
– Power Off mode
– Flash mode

Cellular Mode

In cellular mode phone performes all the tasks to place and release calls.
Also charging and communication between accessories and phone are
done during this mode by OS. Signaling and handover functions are sup­ported by basestation.

Power off

In the power–off mode only CCONT is active. Power–off mode can be left
by pushing the PWR–key, connecting charger to the phone, real time
clock interrupt or intelligent battery interrupt.

Locals Mode

Locals mode is used for testing purposes by Product Development, Pro­duction and After Sales. The Cellular Software is stopped (no signalling
to base station), and the phone is controlled by MBUS/FBUS messages
by the controlling PC.

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Baseband Module

Block Diagram

TX/RX SIGNALS

COBBA

UI

COBBA SUPPLY

RF SUPPLIES

CCONT

BB SUPPLY

Technical Documentation

PA SUPPLY

32kHz
CLK

SLEEP CLOCK

SIM

13MHz
CLK

SYSTEM CLOCK

AUDIOLINES

BASEBAND

MAD
+

MEMORIES

VBAT

BATTERY

CHAPS

SYSCON

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Power Distribution Diagram

Charger

Charge

control

UR4 engine

CCONT

System Module

VBAT

TX PA

RF

1800

VR1
VR2
VR3
VR4
VR5
VR6
VR7

VREF

Battery

VSIM

VBB

V5V

UI Module

Baseband

COBBA
analog

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Technical Documentation

External interfaces

Antenna

4

Battery

Pack

3

Charger

IBI

Connector Name Code Notes

Bottom & IBI connector 54690061 Includes DC plug and microphone connec-

User Interface Module connector 5460021 28 pins, spring contacts.

UR9

ENGINE

6

Bottom
connectorconnector

SIM

6

Mic

tions.

28

User
Interface

Module

Display
Keyboard

Backlights

Speaker

Buzzer

Battery connector 5469069 2 pieces, 2 connections each.
SIM connector 5400085 Supports 3V/5V SIM cards

Flash Programming connector

The system connector can be used as a flash prom programming interface for
flash memories for updating (i.e. re–programming) the flash program memory.

The phone has to be switched off, when the flash prommer is connected to the
phone system connector. The baseband is powered up as the supply voltage
is connected to the charger contacts, or by pressing the PWR button, or by an
IBI device.

The program execution starts from the BOOT ROM and the MCU investigates
in the early start–up sequence if the flash prommer is connected. This is done
by checking the status of the MBUS–line. Normally this line is high but when
the flash prommer is connected the line is forced low by the prommer. The
flash prommer serial data receive line is in receive mode waiting for an ac­knowledgement from the phone. The data transmit line from the baseband to
the prommer is initially high. When the baseband has recognized the flash
prommer, the TX–line is pulled low. This acknowledgement is used to start the
data transfer of the first two bytes from the flash prommer to the baseband on
the RX–line. The data transmission begins by starting the serial transmission
clock (MBUS–line) at the prommer.

The 5V programming voltage is supplied inside the transceiver from the battery
voltage with a switch mode regulator (5V/30mA) of the CCONT. The voltage is
fed via UI connector to avoid damage of the CCONT during production line
flasing ( 12V fed to FLASH Vpp from the production tester ).

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Pin Name Parameter Min Typ Max Unit Remark

1 VIN Supply

Voltage

11 MBUS Serial clock

from the

Prommer

12 FBUS_RX Serial data

from the

Prommer

13 FBUS_TX Data ac-

knowledge to
the Prommer

13 GND GND 0 0 V Supply ground

6.8 7.8 8.8 V Supply Voltage,Current li-

2.0
0

2.0
0

2.0
0

2.8

0.8

2.8

0.8

2.8

0.8

V Prommer detection and

V Receive Data from

V Transmit Data from Base-

System Module

mitted to 850 mA

Serial Clock for synchro-

nous communication

Prommer to Baseband

band to Prommer

Battery connector

The BSI contact on the battery connector is used to detect when the bat­tery is to be removed to be able to shut down the operations of the SIM
card before the power is lost if the battery is removed with power on. The
BSI contact in the battery pack should be shorter than the supply power
contacts to give enough time for the SIM shut down.

A vibra alerting device is used for giving silent signal to the user of an in­coming call. The device is not placed in the phone but it will be added to a
special battery pack. The vibra is controlled with a PWM signal by the
MAD via the BTEMP battery terminal.

SIM card connector

Pin Name Parameter Min Typ Max Unit Notes

1 GND GND 0 0 V Ground
2 VSIM 5V SIM Card

3V SIM Card

3 DATA 5V Vin/Vout

3V Vin/Vout

4 SIMRST 5V SIM Card

3V SIM Card

5 SIMCLK Frequency

Trise/Tfall

4.8

2.8

4.0
0

2.8
0

4.0

2.8

1.625 3.25 5.0

5.0

3.0
”1”

”0”
”1”
”0”

”1”
”1”

5.2

3.2

VSIM

0.5

VSIM

0.5

VSIM
VSIM

25

V Supply voltage

V SIM data

Trise/Tfall max 1us

V SIM reset

MHz

ns

SIM clock

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Real time clock

Requirements for a real time clock implementation are a basic clock
(hours and minutes), a calender and a timer with alarm and power on/off
–function and miscellaneous calls. The RTC will contain only the time
base and the alarm timer but all other functions (e.g. calendar) will be im­plemented with the MCU software. The RTC needs a power backup to
keep the clock running when the phone battery is disconnected. The
backup power is supplied from a rechargable polyacene battery that can
keep the clock running some ten minutes. If the backup has expired, the
RTC clock restarts after the main battery is connected. The CCONT
keeps MCU in reset until the 32kHz source is settled (1s max).

The CCONT is an ideal place for an integrated real time clock as the asic
already contains the power up/down functions and a sleep control with
the 32kHz sleep clock, which is running always when the phone battery is
connected. This sleep clock is used for a time source to a RTC block.

Technical Documentation

Signals between baseband and User Interface section

The User interface section is implemented on separate UI board, which
connects to the engine board with a board to board spring connector.

User Interface module connection

The User interface section comprises the keyboard with keyboard lights,
display module with display lights, an earphone and a buzzer.

Earphone

The internal earphone is connected to the UI board by means of mount­ing springs for automatic assembly. The low impedance, dynamic type
earphone is connected to a differential output in the COBBA audio codec.
The voltage level at each output is given as reference to ground. Ear­phone levels are given to 32 ohm load.

Buzzer

Alerting tones and/or melodies as a signal of an incoming call are gener­ated with a buzzer that is controlled with a PWM signal by the MAD. Also
keypress and user function response beeps are generated with the buzz­er. The buzzer is a SMT device and is placed on the UI board.

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Technical Documentation

Power Distribution

In normal operation the baseband is powered from the phone‘s battery.
The battery consists of three Nickel– cells. There is also a possibility to
use batteries consisting of one Lithium–cell. An external charger can be
used for recharging the battery and supplying power to the phone. The
charger can be either so called fast charger, which can deliver supply cur­rent up to 850 mA or a standard charger that can deliver around 300 mA.

The baseband contains components that control power distribution to
whole phone excluding the power amplifier, which have a continuous
power rail direct from the battery. The battery feeds power directly to
three parts of the system: CCONT, power amplifier, and UI (buzzer and
display and keyboard lights).

The power management circuitry provides protection agains overvol­tages, charger failures and pirate chargers etc. that would otherwise
cause damage to the phone. The circuitry is implemented in the begin­ning with discrete components, but it will be partly or fully integrated on
later phase.

System Module

PA SUPPLY

VCOBBA

COBBA

UI

VBAT

VBB

MAD

+

MEMORIES

BASEBAND

RF SUPPLIES

CCONT

PWRONX

CNTVR

VBB

PURX

V2V

CONNECTOR

POWER
MGMT

VIN

VSIM

VBAT

PWM

SIM

RTC

BACKUP

BATTERY

The heart of the power distrubution is the CCONT. It includes all the volt­age regulators and feeds the power to the whole system. The whole
baseband is powered from the same regulator which provides 2.8V base­band supply VBB. The baseband regulator is active always when the
phone is powered on. The baseband regulator feeds MAD and memories,
COBBA digital parts and the LCD driver in the UI section. There is a sep­arate regulator for a SIM card.

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System Module

The regulator is selectable between 3V and 5V and controlled by the
SIMPwr line from MAD to CCONT. SIM card regulator is also used for af­ter sales flash programming. COBBA analog parts are powered from a
dedicated 2.8V supply VCOBBA by the CCONT. The CCONT supplies
also 5V for RF. The CCONT contains a real time clock function, which is
powered from a RTC backup when the main battery is disconnected. The
RTC backup is rechargable polyacene battery.

CCONT includes also six additional 2.8V regulators providing power to
the RF section. These regulators can be controlled either by the direct
control signals from MAD or by the RF regulator control register in
CCONT which MAD can update. Below are the listed the MAD control
lines and the regulators they are controlling.

– TxPwr controls VTX regulator (VR7)
– RxPwr controls and VRX regulators (VR2 and VR5)
– SynthPwr controls VSYN_A and VSYN_D regulators (VR4 and VR3)
– VCXOPwr controls VXO and VCOBBA regulators (VR1 and VR6)

Technical Documentation

CCONT generates also a 1.5 V reference voltage VREF to COBBA,
PLUSSA and CRFU. The VREF voltage is also used as a reference to
some of the CCONT A/D converters.

In additon to the above mentioned signals MAD includes also TXP control
signal which goes to PLUSSA power control block and to the power am­plifier. The transmitter power control TXC is led from COBBA to PLUSSA.

Regulator Max.current Unit Vout Unit Notes

VR1 25 mA 2.8 V VVCXO
VR2 25 mA 2.8 V NOT USED
VR3 50 mA 2.8 V VSYN_D
VR4 90 mA 2.8 V VSYN_A
VR5 80 mA 2.8 V VRX
VR6 100 mA 2.8 V COBBA
VR7 150 mA 2.8 V VTX .Depends on exter

nal BJT

V2V 50 mA 1.3 –

2.65

V MAD core voltage, in

225mV steps (1.975V
default)

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VBB ON
VBB SLEEP

VSIM 30 mA 3.0/

V5V 30 mA 5.0 V for RF

125
1

mA
mA

2.8

2.8

5.0

V current limit 250mA

current limit 5mA

V VSIM output voltage

selectable,Used also for
flashing. (VPP)

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Technical Documentation

Power up

The baseband is powered up by:

1. Pressing the power key, that generates a PWRONX interrupt
signal from the power key to the CCONT, which starts the pow­er up procedure.

2. Connecting a charger to the phone. The CCONT recognizes
the charger from the VCHAR voltage and starts the power up
procedure.

Before battery voltage voltage rises over 3.0 V Charging Logic
gives an initial charge (with limited current) to the battery. After
battery voltage reaches that voltage limit the power up proce­dure is as described in the previous chapters.

3. A RTC interrupt. If the real time clock is set to alarm and the
phone is switched off, the RTC generates an interrupt signal,
when the alarm is gone off. The RTC interrupt signal is con­nected to the PWRONX line to give a power on signal to the
CCONT just like the power key.

System Module

When the CCONT is activated, it swithes on the baseband supply voltage
and generates a power up reset signal PURX to the MAD. When the
PURX reset is released, the MAD releases the system reset ExtSysReset
and the internal MCUResetX signals and starts the boot program execu­tion. If booting is succeeded program execution continues from flash pro­gram memory. When the phone is powered up with an empty battery pack
using the standard charger, the charger may not supply enough current
for standard powerup procedure and the powerup must be delayed.

Acting Dead

If the phone is off when the charger is connected, the phone is powered
on but enters a state called ”acting dead”. To the user the phone acts as if
it was switched off. A battery charging alert is given and/or a battery
charging indication on the display is shown to acknowledge the user that
the battery is being charged.

4. A battery interrupt. Intelligent battery packs have a possibility
to power up the phone. When the battery gives a short (10ms)
voltage pulse through the BTEMP pin, the CCONT wakes up
and starts the power on procedure.

Active Mode

In the active mode the phone is in normal operation, scanning for chan­nels, listening to a base station, transmitting and processing information.
All the CCONT regulators are operating. There are several substates in
the active mode depending on if the phone is in burst reception, burst
transmission, if DSP is working etc..

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Sleep Mode

In the sleep mode all the regulators except the baseband VBB and the
SIM card VSIM regulators are off. Sleep mode is activated by the MAD
after MCU and DSP clocks have been switched off. The voltage regula­tors for the RF section are switched off and the VCXO power control,
VCXOPwr is set low. In this state only the 32 kHz sleep clock oscillator in
CCONT is running. The flash memory power down input is connected to
the VCXO power control, so that the flash is deep powered down during
sleep mode.

The sleep mode is exited either by the expiration of a sleep clock counter
in the CCONT or by some external interrupt, generated by a charger con­nection, key press, headset connection etc. The MAD starts the wake up
sequence and sets the VCXOPwr control high. After VCXO settling time
other regulators and clocks are enabled for active mode.

If the battery pack is disconnect during the sleep mode, the CCONT
should power down the SIM in the sleep mode as there is no time to wake
up the MCU.

Technical Documentation

Charging

The power management circuitry controls the charging current delivered
from the charger to the battery. Charging is controlled with a PWM input
signal, generated by the CCONT. The PWM pulse width is controlled by
the MAD and sent to the CCONT through a serial data bus. The battery
voltage rise is limited to a specified level by turning the switch off. Charg­ing current is passed through protection ASIC CHAPS and monitored by
measuring the voltage drop across a 220mohm resistor.

2–wire charging

With 2–wire charging the charger provides constant output current, and
the charging is controlled by PWMOUT signal from CCONT to Charging
Logic. PWMOUT signal frequency is selected to be 1 Hz, and the charg­ing switch in Charging Logic is pulsed on and off at this frequency. The
final charged energy to battery is controlled by adjusting the PWMOUT
signal pulse width.

Both the PWMOUT frequency selection and pulse width control are made
MCU which writes these values to CCONT.

3–wire charging

With 3–wire charging the charger provides adjustable output current, and
the charging is controlled by PWMOUT signal from CCONT to Charger,
with the bottom connector signal. PWMOUT signal frequency is selected
to be 32 Hz, and the charger output current is controlled by adjusting the
PWMOUT signal pulse width. The charger switch in Charging Logic is
constantly on in this case.

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