Nokia 6120 System Module 03

PAMS Technical Documentation

NSC–3 Series Transceivers

Chapter 3

System Module

US4U/US4RM/US4RSMD

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System Module US4U/US4RM/US4RSMD

CONTENTS

Transceiver NSC–3 3 – 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Introduction 3 – 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Functional Description 3 – 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Interconnection Diagram 3 – 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

System Module 3 – 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

External and Internal Connectors 3 – 8. . . . . . . . . . . . . . . . . . . . .

System Connector Signals 3 – 9. . . . . . . . . . . . . . . . . . . . . . . .

RF–Connector 3 – 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Battery Contacts 3 – 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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

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

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

Analog Control Channel (ACCH) Mode 3 – 11. . . . . . . . . . . . . . . .

Analog Voice Channel (AVCH) Mode 3 – 12. . . . . . . . . . . . . . . . .

Digital Control Channel (DCCH) 800 MHz Mode 3 – 12. . . . . . . .

Digital Traffic Channel (DTCH) 800 MHz Mode 3 – 12. . . . . . . . .

Out of Range (OOR) Mode 3 – 13. . . . . . . . . . . . . . . . . . . . . . . . . .

Locals Mode 3 – 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Power Distribution Diagram 3 – 14. . . . . . . . . . . . . . . . . . . . . . . . . .

External interfaces 3 – 15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Signals between baseband and User Interface section 3 – 15. .

User Interface module connection 3 – 15. . . . . . . . . . . . . . . . . . . .

Earphone 3 – 15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Buzzer 3 – 15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Baseband Module 3 – 16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Power Distribution 3 – 16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Charging Control 3 – 17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2–wire charging 3 – 17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3–wire charging 3 – 18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Watchdog 3 – 18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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

Power up when power–button is pushed 3 – 19. . . . . . . . . . . . . .

IBI (Intelligent Battery Interface) 3 – 20. . . . . . . . . . . . . . . . . . . . . .

Mixed trigger to power up 3 – 20. . . . . . . . . . . . . . . . . . . . . . . . . . .

Power Off 3 – 20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Power off by pushing Power–key 3 – 20. . . . . . . . . . . . . . . . . . . . .

Power off when battery voltage low 3 – 21. . . . . . . . . . . . . . . . . . .

Power off when fault in the transmitter 3 – 21. . . . . . . . . . . . . . . .

Sleep Mode 3 – 21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Waking up from the Sleep–mode 3 – 21. . . . . . . . . . . . . . . . . . . . .

Baseband submodules 3 – 22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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CTRLU 3 – 22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

MCU main features 3 – 22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

DSP main features 3 – 23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

System Logic main features 3 – 23. . . . . . . . . . . . . . . . . . . . . . . . .

Memories 3 – 23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

AUDIO–RF 3 – 24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Cobba main features 3 – 24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Speech processing 3 – 25. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Alert Signal Generation 3 – 25. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

PWRU 3 – 26. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

CCONT main features 3 – 26. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

CHAPS main features 3 – 26. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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

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

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

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

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

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

Receiver 3 – 30. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

DAMPS800 RX 3 – 30. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Transmitter 3 – 31. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

DAMPS800 TX 3 – 31. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Frequency Synthesizers 3 – 31. . . . . . . . . . . . . . . . . . . . . . . . . . . .

DAMPS800 operation 3 – 32. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Supply voltages in different modes of operation 3 – 32. . . . . . . .

Software Compensations 3 – 33. . . . . . . . . . . . . . . . . . . . . . . . . . . .

Power Levels (TXC) vs. Temperature 3 – 33. . . . . . . . . . . . . . .

Power Levels (TXC) vs. Channel 3 – 33. . . . . . . . . . . . . . . . . . .

Power levels vs. Battery Voltage 3 – 33. . . . . . . . . . . . . . . . . . .

TX Power Up/Down Ramps 3 – 33. . . . . . . . . . . . . . . . . . . . . . .

Modulator Output Level 3 – 33. . . . . . . . . . . . . . . . . . . . . . . . . . .

Digital Mode RSSI 3 – 33. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

RF Block Specifications 3 – 34. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Receiver 3 – 34. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

DAMPS 800 Mhz Front End 3 – 34. . . . . . . . . . . . . . . . . . . . . . . . .

First IF Filter 3 – 34. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Transmitter 3 – 35. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

RF Characteristics 3 – 35. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Power Levels 3 – 35. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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

UHF 3 – 35. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

VHF 3 – 36. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Output Levels 3 – 36. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Connections 3 – 37. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

RF–Baseband signals 3 – 37. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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Data Interface and Timing 3 – 43. . . . . . . . . . . . . . . . . . . . . . . . . . .

Digital control channels 3 – 44. . . . . . . . . . . . . . . . . . . . . . . . . . .

Analog control channel 3 – 45. . . . . . . . . . . . . . . . . . . . . . . . . . .

Parts list of US4U (EDMS Issue 8.3) Code: 0200973 3 – 46. . . . . . . .

Parts list of US4RM (EDMS Issue 3.2) Code: 0201308 3 – 55. . . . . .

Parts list of US4RSMD (EDMS Issue 3.0) Code: 0201371 3 – 64. . .

Schematic Diagrams: US4U
Circuit Diagram of System Blocks (Version 16 Edit 188) layout 16 3/A3–1
Circuit Diagram of Power Supply (Version 16 Edit 286) layout 16 3/A3–2
Circuit Diagram of CTRLU Block (Version 16 Edit 287) layout 16 3/A3–3
Circuit Diagram of Audio (Version 16 Edit 213) for layout version 16 3/A3–4
Circuit Diagram of Transmitter (Version 16 Edit 549) layout 16 3/A3–5

Technical Documentation

Circuit Diagram of Receiver (Version 16 Edit 129) for layout version 16 3/A3–6
Circuit Diagram of Synthesizer (Version 16 Edit 156) for layout 16 3/A3–7
Circuit Diagram of RF Block (Version 16 Edit 104) for layout version 16 3/A3–8
Circuit Diagram of RF–BB Interface (Version 16 Edit 70) layout 16 3/A3–9

Layout Diagram of US4U (Layout version 16) 3/A3–10. . . . . . . . . . . . . .

Schematic Diagrams: US4RM
Circuit Diagram of System Blocks (Version 05.03 Edit 2) layout 5 3/A3–1
Circuit Diagram of Power Supply (Version 05.01 Edit 4) layout 5 3/A3–2
Circuit Diagram of CTRLU Block (Version 05.01 Edit 4) layout 5 3/A3–3
Circuit Diagram of Audio (Version 06.01 Edit 3) for layout version 5 3/A3–4
Circuit Diagram of Transmitter (Version 05.01 Edit 2) layout 5 3/A3–5
Circuit Diagram of Receiver (Version 05.01 Edit 2) for layout version 5 3/A3–6
Circuit Diagram of Synthesizer (Version 05.01 Edit 2) for layout 5 3/A3–7
Circuit Diagram of RF Block (Version 06.01 Edit 2) for layout version 5 3/A3–8
Circuit Diagram of RF–BB Interface (Version 06.01 Edit 3) layout 5 3/A3–9

Layout Diagram 1/2 of US4RM (Layout version 5) 3/A3–10. . . . . . . . . . .

Layout Diagram 2/2 of US4RM (Layout version 5) 3/A3–11. . . . . . . . . . .

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Schematic Diagrams: US4RSMD
Circuit Diagram of System Blocks (Version 06.41 Edit 9) 3/A3–1
Circuit Diagram of Power Supply (Version 06.41 Edit 8) 3/A3–2
Circuit Diagram of CTRLU Block (Version 06.41 Edit 7) 3/A3–3
Circuit Diagram of Audio (Version 06.41 Edit 7) 3/A3–4
Circuit Diagram of Transmitter (Version 06.41 Edit 11) 3/A3–5
Circuit Diagram of Receiver (Version 06.41 Edit 11) 3/A3–6
Circuit Diagram of Synthesizer (Version 06.41 Edit 8) 3/A3–7
Circuit Diagram of RF Block (Version 06.41 Edit 6) 3/A3–8
Circuit Diagram of RF–BB Interface (Version 06.41 Edit 11) 3/A3–9

Layout Diagram 1/2 of US4RSMD (Phase 3) 3/A3–10. . . . . . . . . . . . . . .

Layout Diagram 2/2 of US4RSMD (Phase 3) 3/A3–11. . . . . . . . . . . . . . .

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Transceiver NSC–3

Introduction

The NSC–3 is a radio transceiver unit for the TDMA 800 networks. The
transceiver is true 3 V transceiver.

The transceiver consists of System/RF module ( US4U Phase1, US4RM
Phase 2 and US4RSMD Phase 3), User interface module ( UE4 ) and as­sembly parts.

The purpose of the baseband module is to control the phone and process
audio signals to and from RF. The module also controls the user inter­face.

The transceiver has full graphic display and two soft key based user inter­face.

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

Technical Documentation

Functional Description

There are five different operation modes:

– power off mode
– sleep 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

User Interface

Module

Keypad

System Module US4U/US4RM/US4RSMD

9

Display

UE4

2

Earpiece

28

4

Antenna

1

(including Mic)

US4U/US4RM/

System

Connector

Connector

Battery

System/RF

Module

US4RSMD

3 + 36+2

2

Charger

RF

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System Module

External and Internal Connectors

B side view

Fixing pads (2 pcs)

Engine PCB

DC Jack

1

Microphone

acoustic ports

Technical Documentation

IBI connector

(6 pads)

8

7

14

Bottom

connector (6 pads)

A side view

Charger pads (3 pcs)

Cable locking holes (3 pcs)

Cavity for microphone

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System Module US4U/US4RM/US4RSMD

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

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 attempt

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
Short term operation > +70 oC

+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

possible without permanent

damage

tery

tery

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Functional Description

The US4U (Phase 1) / US4RM (Phase 2) / US4RSMSD (Phase 3) engine
consist of a Baseband/RF module with connections to a separate User
Interface module. Baseband and RF submodules are interconnected with
PCB wiring. The engine can be connected to accessories via bottom system
connector and an 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 RF submodule can further be devided into lower band and
upper band functions.

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 US4U/US4RM/US4RSMD

Modes of Operation

US4U/US4RM/US4RSMD operates in five cellular modes and a local mode
for service:

– Analog Control Channel (ACCH) 800 MHz Mode,
– Analog Voice Channel (AVCH) 800 MHz Mode,
– Digital Control Channel (DCCH) 800 MHz Mode,
– Digital Traffic Channel (DTCH) 800 MHz Mode,
– Out of Range (OOR) Mode,
– Locals mode, used by Production and After Sales.

Analog Control Channel (ACCH) Mode

On analog control channel the phone receives continuous signalling
messages on Forward Control Channel (FOCC) from the base station, being
most of the time in IDLE mode. Only the receiver part is on. The phone scans
the preferred dedicated control channels to find and lock to the strongest
channel for reading information from this control channel.

DSP is not used on ACCH (it stays in sleep mode), except during channel
scanning for loading the synthesizers.

As a separate sleep clock is used, also the VCTCXO can be turned off
periodically with the RF parts. Only the sleep clock and necessary timers in
MCU are operational.

When registration is demanded the phone sends (TX on) it’s information on
Reverse Control Channel (RECC) to the base station. The phone’s location
is updated in the switching office.

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If a call is initiated, either by the user or the base station, the phone moves
to the allocated analog voice channel or digital traffic channel depending on
the orders by the base station.

Analog Voice Channel (AVCH) Mode

The phone receives and transmits analog audio signal. All circuitry is
powered on (except the receiver parts used only in digital modes). DSP does
the audio processing and in Hands Free mode also performs
echo–cancellation and HF algorithms. The COBBA IC makes A/D
conversion for the MIC signal, and D/A conversion for the EAR signal.

With audio signal also the Supervisory Audio Tone (SAT) is being received
from the base station. The SA T frequency can be 5970 Hz, 6000Hz or 6030
Hz, defined by the base station. The DSP phase lock loop locks to the SA T,
detects if the frequency is the expected one and examines the signal quality .
DSP reports SAT quality figures regularily to the MCU. The received SAT
signal is transmitted back (transponded) to the base station.

Technical Documentation

The base station can send signalling messages on Forward Voice Channel
(FVC) to the phone, by replacing the audio with a burst of Wide Band Data
(WBD). These are typically hand–off or power level messages. The RX
modem in System Logic receives the signalling message burst and gives an
interrupt to the MCU for reading the data. MCU gives a message to DSP to
mute the audio path during the burst. MCU can acknowledge the messages
on Reverse V oice Channel (RVC), where DSP sends the WBD to transmitter
RF.

Digital Control Channel (DCCH) 800 MHz Mode

On digital control channel (DCCH) DSP receives the paging information from
the Paging channels and sends the messages to MCU for processing.

Each Hyperframe (HFC) comprises two Superframes (SF), the Primary (p)
and the Secondary (s) paging frame. The assigned Page Frame Class (PFC)
defines the frames which must be received, and thus defines when the
receiver must be on.

The phone is in sleep mode between the received time slots. The sleep clock
timer is set and MCU, DSP and RF parts (including VCTCXO) are powered
down. Only sleep clock and the respective timers are running.

From DCCH phone may be ordered to analog control channel or to analog
or digital traffic channel.

Digital Traffic Channel (DTCH) 800 MHz Mode

Digital Voice Channel (S–DTCH)

On digital voice channel DSP processes the speech signal in 20 ms time
slots. DSP performs the speech and channel functions in time shared
fashion and is in sleep mode whenever possible. RX and TX parts are

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powered on and off according to the slot timing. MCU is waken up mainly
by DSP, when there is signalling information for the Cellular Software.

Digital Data Channel (D–DTCH)

In Digital Data Channel Mode audio processing is not needed and audio
circuitry can be shut down. Otherwise the mode is similar to Digital Voice
Channel Mode.

Out of Range (OOR) Mode

If the phone can’t find signal from the base station on any control channel
(analog or digital) it can go into OOR mode for power saving. All RF circuits
are powered down and the baseband circuits in a low power mode, VCTCXO
stopped and only the sleep clock running. After a programmable timer in
MCU has elapsed the phone turns the receiver on and tries to receive
signalling data from base station. If it succeeds, the phone goes to standby
mode on analog or digital control channel. If the connection can not be
established the phone returns to OOR mode until the timer elapses again.

System Module US4U/US4RM/US4RSMD

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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Power Distribution Diagram

UT4U Engine

PENTA

Charger

CCONT

Charge
control

VR8
VR9

VR10

VR11

VR12

VR1
VR2
VR3
VR4
VR5
VR6
VR7

VREF

VSIM

Technical Documentation

PA 1900 MHz

PA 800 MHz

RF

1900 MHz

800 MHz

Battery

VBB
V5V

UI Module

Baseband

COBBA
analog

Flash
ROM

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External interfaces

4

Battery

Pack

3

Charger

IBI

Connector Name Notes

Antenna

US4U

ENGINE

6

Accessories

Bottom
connectorconnector

System Module US4U/US4RM/US4RSMD

User

28

22

Mic

Interface

Module

Display
Keyboard

Backlights

Speaker

Buzzer

Bottom connector + IBI connector Includes control, data, charging and audio sig-

nals

UI–connector includes keyboard, backlight, display,buzzer, call

led, and earpiece signals
Battery connector VBAT, GND, BTYPE, BTEMP
RF–interface Connection

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. The
buzzer is a SMD device and is placed on the UI board.

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Baseband Module
Power Distribution

In normal operation the baseband is powered from the phone‘s battery.
The battery consists of one Lithium–cell. There is also a possibility to use
batteries consisting of three Nickel– cells. 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.

VCXO

CHAPS

VCHAR

BATTERY

Technical Documentation

COBBA LCD–DRVR

MAD

VBAT

CCONT

PWM

V2V
VR1_SW

VR1
VR6
VBB

FLASH

SIO

VSIM
V5V
Vref

RF

VR1–VR7

Battery voltage VBAT is connected to CCONT which regulates all the sup­ply voltages VBB, VR1–VR7, V2V, VR1_SW, VSIM and V5V. VR7 is di­vided into VR7 and VR7_bias. VR7_bias is for RF, because PA is heating
and this reduces the heat. CCONT enables automatically VR1, VBB,
V2V_core, VR6 and Vref in power–up.

VBB is used as baseband power supply for all digital parts, and it is
constantly on whenever the phone is powered up. There is also another
Baseband voltage, V2V, which is reserved for later version of MAD circuit.
V2V will be used as a lower core voltage for MAD internal parts, by sup­plying it to specific MAD core voltage pins. Until that time, VBB will be
used for all MAD pins. VSIM can be used as programming voltage for the
Flash memory, if re–flashing is needed after initial flash programming in
production. V5V is used for RF parts only.

VR1 is used for the VCXO supply. VR1_SW is derived from VR1 inside
CCONT, and is actually the same voltage, but can be separately switched

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Technical Documentation

on and off. This VR1_SW is used as bias voltage for microphone, during
talk modes. Voltage VR6 is used in COBBA for analog parts and also
in RF parts. RFCEN signal to CCONT controls both the VR1 and VR6
regulators; they can be switched off in sleep modes, during standby.

CCONT regulators are controlled either through SIO from MAD or timing
sensitive regulators are controlled directly to their control pins. These two
control methods form a logical OR–function, i.e. the regulator is enabled
when either of the controls is active. Most of the regulators can be individ­ually controlled.

CHAPS connects the charger voltage (VCHAR) to battery. MCU of MAD
controls the charging through CCONT. MAD sets the parameters to
PWM–generator in CCONT and PWM–output controls the charging volt­age in charger.

When battery voltage is under 3.0V, CHAPS controls independently the
charging current to battery.

Charging Control

System Module US4U/US4RM/US4RSMD

System

Connector

To

charger

Charging is controlled by MCU SW, which writes control data to CCONT
via serial bus. CCONT output pin PWMOUT (Pulse Width Modulation)
can be used to control both the charger and the CHAPS circuit inside
phone.

2–wire charging

Vin

PWMOUT
Charging Control

CHAPS

BATTERY

MAD

CCONT

serial control

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

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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 voltage is controlled by adjusting the
PWMOUT signal pulse width. The charger switch in CHAPS is constantly
on in this case.

Watchdog

VCXO

Technical Documentation

BATTERY

MAD COBBA

CCONT

32 kHz

VR1
VR6
VBB
SLCLK

MCU

LOGIC

SIO

Both MAD and CCONT include a watchdog, and both use the 32 kHz
sleep clock. The watchdog in MAD is the primary one, and this is called
SW–watchdog. MCU has to update it regularly. If it is not updated, logic
inside MAD gives reset to MAD. After the reset, MCU can read an inter­nal status bit to see the reason for reset, whether it was from MAD or
CCONT. The SW–watchdog delay can be set between 0 and 63 seconds
at 250 millisecond steps; and after power–up the default value is the max.
time.

MAD must reset CCONT watchdog regularly. CCONT watchdog time can
be set through SIO between 0 and 63 seconds at 1 second steps. After
power–up the default value is 32 seconds. If watchdog elapses, CCONT
will cut off all supply voltages.

After total cut–off the phone can be re–started through any normal pow­er–up procedure.

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Technical Documentation

Power up

When the battery is connected to phone, nothing will happen until the
power–up procedure is initiated, for instance by pressing the power–but­ton (or by connecting charger voltage). After that the 32kHz crystal oscil­lator of CCONT is started (can take up to 1 sec), as well as the regulators
are powered up.

If power down is done, and the battery remains connected, the 32 kHz
crystal oscillator keeps still running in the CCONT. When power–up is ini­tiated again, the complete power–up sequence is like in the figure below.
This time the power–up sequence is faster, because the oscillator is al­ready running.

Power up when power–button is pushed

PWRONX

System Module US4U/US4RM/US4RSMD

VR1, VBB, VR6
RFCEN

RFCSETTLED
RFC (VCXO)

COBBACLK
PURX

SLCLK

t1

t2

t3

t1 < 1 ms
t2 1 – 6 ms, VCXO settled
t3 62 ms, PURX delay generated by CCONT

After PWR–key has been pushed, CCONT gives PURX reset to MAD and
COBBA, and turns on VR1, VBB and VR6 regulators (if battery voltage
has exceeded 3.0 V). VR1 supplies VCXO, VBB supplies MAD and digital
parts of COBBA, and VR6 supplies analog parts of COBBA and some RF

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parts. After the initial delay t2 VCXO starts to give proper RFC to COBBA
that further divides it to COBBACLK for MAD. COBBA will output the
COBBACLK only after the PURX reset has been removed. After delay t3
CCONT releases PURX and MAD can take control of the operation of the
phone.

After that MCU–SW in MAD detects that the PWR–key is still pushed and
shows the user that the phone is powering up by starting the LCD and
turning on the lights. MCU–SW must start also RF receiver parts at this
point.

CCONT will automatically power–up also VSIM–regulator (used for pos­sible reFlashing), regardless of the control pin SIMPWR state, and the
regulator default voltage is 3V. VSIM voltage could be selected to be 5V,
by writing the selection via serial bus to CCONT, but that is not needed
with the new Flash versions (Jaguar).

V5V–regulator (for RF) default value is off in power–up, and can be con­trolled on via serial bus when needed.

Technical Documentation

IBI (Intelligent Battery Interface)

Phone can be powered up by external device (accessory or similar) by
providing a start pulse to the battery signal BTEMP; this is detected by
CCONT. After that the power–up procedure is similar to pushing power–
button.

Mixed trigger to power up

It is possible that PWR–key is pushed during charger initiated power–up
procedure or charger is connected during PWR–key initiated power up
procedure. In this kind of circumstances the power–up procedure (in HW
point of view) continues as nothing had happened.

When the Baseband HW is working normally and SW is running, SW de­tects that both conditions are fulfilled and then acts accordingly.

Power Off

Power off by pushing Power–key

MAD (MCU SW) detects that PWR–key is pressed long enough time. Af­ter that the lights and LCD are turned off. MCU stops all the activities it
was doing (e.g. ends a call), sends power off command to CCONT (i.e.
gives a short watchdog time) and goes to idle–task. After the delay
CCONT cuts all the supply voltages from the phone. Only the 32 kHz
sleep clock remains running.

Note that the phone doesn’t go to power off (from HW point of view) when
the charger is connected and PWR–key is pushed. It is shown to user
that the phone is in power off, but in fact the phone is just acting being
powered off (this state is usually called acting dead).

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Power off when battery voltage low

During normal discharge the phone indicates the user that the battery will
drain after some time. If not recharged, SW detects that battery voltage is
too low and shuts the phone off through a normal power down procedure.

Anyway, if the SW fails to power down the phone, CCONT will make a re­set and power down the phone if the battery voltage drops below 2.8 V.

Power off when fault in the transmitter

If the MAD receives fault indication, from the line TXF, that the transmitter
is on although it shouldn’t be, the control SW will power down the phone.

Sleep Mode

The phone can enter SLEEP only when both MCU and DSP request it. A
substantial amount of current is saved in SLEEP. When going to SLEEP
following things will happen

System Module US4U/US4RM/US4RSMD

1. Both MCU and DSP enable sleep mode, set the sleep timer
and enter sleep mode

2. RFCEN and RFCSETTLED –> 0 –> COBBACLK will stop
(gated in COBBA). Also VR1 is disabled –> VCXO supply volt­age is cut off –> RFC stops.

3. LCD display remains the same, no changes

4. Sleep clock (SLCLK) and watchdog in CCONT running

5. Sleep counter in MAD running, uses SLCLK

Waking up from the Sleep–mode

In the typical case phone leaves the SLEEP–mode when the SLEEP–
counter in MAD expires. After that MAD enables VR1 ⇒ VCXO starts run­ning ⇒ after a pre–programmed delay RFCSETTLED rises => MAD re­ceives COBBACLK clock ⇒ MAD operation re–starts.

There are also many other cases when the SLEEP mode can be inter­rupted, in these cases MAD enables the VR1 and operation is started
similarly

– some MCU or DSP timer expires
– DSP regular event interrupt happens
– MBUS activity is detected
– FBUS activity is detected
– Charger is connected, Charger interrupt to MAD
– any key on keyboard is pressed, interrupt to MAD
– HEADSETINT, from system connector XMIC line (EAD)
– HOOKINT, from system connector XEAR line

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Baseband submodules

CTRLU

CTRLU comprises MAD ASIC (MCU, DSP, System Logic) and Memories.
The environment consists of three memory circuits (FLASH,SRAM,EE-

PROM), 22–bit address bus and 8/16–bit data bus. Besides there are
ROM1SELX, ROM2SELX, RAMSELX and EEPROMSELX signals for chip
select.

MCU main features

System control
Cellular Software (CS)

Cellular Software takes care of communication with switching
office, as well call build–up, maintenance and termination.

Technical Documentation

Communication control

M2BUS is used to communicate to external devices. This in­terface is also used for factory testing, service and mainte­nance purposes.

User Interface (UI)

PWR–key, keyboard, LCD, flip/door switch, backlight, mic, ear
and alert (buzzer, vibra, led) control. Serial interface from MAD
to LCD (common for CCONT).

Authentication

Authentication is used to prevent fraud usage of cellular
phones.

RF monitoring

RF temperature monitoring by VCXOTEMP, ADC in CCONT.
Received signal strength monitoring by RSSI, ADC in CCONT.
False transmission detection by TXF signal, digital IO–pin.

Power up/down and Watchdog control

When power key is pressed, initial reset (PURX) has happened
and default regulators have powered up in CCONT, MCU and
DSP take care of the rest of power up procedures (LCD, COB­BA, RF). MCU must regularly reset Watchdog counter in
CCONT, otherwise the power will be switched off.

Accessory monitoring

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Accessory detection by EAD (XMIC/HEADSETINT), AD–con-
verter in CCONT. Connection (FBUS) for data transfer.

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