Nokia 5120 System Module 03
PAMS Technical Documentation
NSC–1 Series Transceivers
Chapter 3
System Module US4RSM
Original 10/98
NSC–1
PAMS
System Module US4RSM
AMENDMENT RECORD SHEET
Amendment
Number
Date Inserted By Comments
10/98 Original
Technical Documentation
Page 3 – 2
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NSC–1
Technical Documentation
System Module US4RSM
CONTENTS
System Module US4RSM 3 – 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
External and Internal Connectors 3 – 6. . . . . . . . . . . . . . . . . . . . .
System Connector Signals 3 – 7. . . . . . . . . . . . . . . . . . . . . . . .
RF–Connector 3 – 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Battery Contacts 3 – 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating Conditions 3 – 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Functional Description 3 – 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Modes of Operation 3 – 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Analog Control Channel (ACCH) Mode 3 – 9. . . . . . . . . . . . . . . .
Analog Voice Channel (AVCH) Mode 3 – 10. . . . . . . . . . . . . . . . .
Digital Control Channel (DCCH) 800 MHz Mode 3 – 10. . . . . . . .
Digital Traffic Channel (DTCH) 800 MHz Mode 3 – 10. . . . . . . . .
Out of Range (OOR) Mode 3 – 11. . . . . . . . . . . . . . . . . . . . . . . . . .
Locals Mode 3 – 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Distribution Diagram 3 – 12. . . . . . . . . . . . . . . . . . . . . . . . . .
External interfaces 3 – 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Signals between baseband and User Interface section 3 – 13. .
User Interface module connection 3 – 13. . . . . . . . . . . . . . . . . . . .
Earphone 3 – 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Buzzer 3 – 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Baseband Module 3 – 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Distribution 3 – 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Charging Control 3 – 15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2–wire charging 3 – 15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3–wire charging 3 – 16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Watchdog 3 – 16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power up 3 – 17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power up when power–button is pushed 3 – 17. . . . . . . . . . . . . .
IBI (Intelligent Battery Interface) 3 – 18. . . . . . . . . . . . . . . . . . . . . .
Mixed trigger to power up 3 – 18. . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Off 3 – 18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power off by pushing Power–key 3 – 18. . . . . . . . . . . . . . . . . . . . .
Power off when battery voltage low 3 – 19. . . . . . . . . . . . . . . . . . .
Power off when fault in the transmitter 3 – 19. . . . . . . . . . . . . . . .
Sleep Mode 3 – 19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Waking up from the Sleep–mode 3 – 19. . . . . . . . . . . . . . . . . . . . .
Baseband submodules 3 – 20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CTRLU 3 – 20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
MCU main features 3 – 20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DSP main features 3 – 21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
System Logic main features 3 – 21. . . . . . . . . . . . . . . . . . . . . . . . .
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Memories 3 – 21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
AUDIO–RF 3 – 22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cobba main features 3 – 22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Speech processing 3 – 23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Alert Signal Generation 3 – 23. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PWRU 3 – 24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CCONT main features 3 – 24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CHAPS main features 3 – 24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
RF Module 3 – 25. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
RF Frequency Plan 3 – 25. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DC Characteristics 3 – 25. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Distribution Diagram 3 – 25. . . . . . . . . . . . . . . . . . . . . . . . . .
Power Distribution – Typical Currents 3 – 27. . . . . . . . . . . . . . . . .
Functional Description 3 – 28. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Receiver 3 – 28. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DAMPS800 RX 3 – 28. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Transmitter 3 – 29. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DAMPS800 TX 3 – 29. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Frequency Synthesizers 3 – 29. . . . . . . . . . . . . . . . . . . . . . . . . . . .
DAMPS800 operation 3 – 30. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Supply voltages in different modes of operation 3 – 30. . . . . . . .
Software Compensations 3 – 31. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Levels (TXC) vs. Temperature 3 – 31. . . . . . . . . . . . . . .
Power Levels (TXC) vs. Channel 3 – 31. . . . . . . . . . . . . . . . . . .
Power levels vs. Battery Voltage 3 – 31. . . . . . . . . . . . . . . . . . .
TX Power Up/Down Ramps 3 – 31. . . . . . . . . . . . . . . . . . . . . . .
Modulator Output Level 3 – 31. . . . . . . . . . . . . . . . . . . . . . . . . . .
Digital Mode RSSI 3 – 31. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
RF Block Specifications 3 – 32. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Receiver 3 – 32. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DAMPS 800 Mhz Front End 3 – 32. . . . . . . . . . . . . . . . . . . . . . . . .
First IF Filter 3 – 32. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Transmitter 3 – 33. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
RF Characteristics 3 – 33. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Levels 3 – 33. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Synthesizers 3 – 33. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
UHF 3 – 33. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
VHF 3 – 34. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output Levels 3 – 34. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Connections 3 – 36. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
RF–Baseband signals 3 – 36. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Data Interface and Timing 3 – 42. . . . . . . . . . . . . . . . . . . . . . . . . . .
Digital control channels 3 – 43. . . . . . . . . . . . . . . . . . . . . . . . . . .
Analog control channel 3 – 44. . . . . . . . . . . . . . . . . . . . . . . . . . .
Parts list of US4RSM (EDMS Issue 2.0) Code: 0201343 .
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System Module US4RSM
Schematic Diagrams: US4RSM
Circuit Diagram of System Blocks (Version 4.03 Edit 3) 3/A3–1. . . . .
Circuit Diagram of Power Supply (Version 04.03 Edit 5) 3/A3–2. . . . .
Circuit Diagram of CTRLU Block (Version 04.03 Edit 3) 3/A3–3. . . . . .
Circuit Diagram of Audio (Version 4.03 Edit 6) 3/A3–4. . . . . . . . . . . . .
Circuit Diagram of Transmitter (Version 4.3 Edit 5) 3/A3–5. . . . . . . . . .
Circuit Diagram of Receiver (Version 4.3 Edit 03) 3/A3–6. . . . . . . . . . .
Circuit Diagram of Synthesizer (Version 4.3 Edit 3) 3/A3–7. . . . . . . . .
Circuit Diagram of RF Block (Version 04.03 Edit 2) 3/A3–8. . . . . . . . . .
Circuit Diagram of RF–BB Interface (Version 4.03 Edit 03) 3/A3–9. . .
Layout Diagram 1/2 of US4RSM (Layout version 04) 3/A3–10. . . . . . . .
Layout Diagram 2/2 of US4RSM (Layout version 04) 3/A3–11. . . . . . . .
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System Module US4RSM
System Module US4RSM
The purpose of the system module is to control the phone and process
audio signals to and from RF. The module also controls the user interface.
External and Internal Connectors
B side view
Fixing pads (2 pcs)
Technical Documentation
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 Module US4RSM
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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Technical Documentation
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 –20 oC ... +40 oC Specifications fulfilled
Reduced performance condi-
tions
Intermittent operation condi-
tions
Cessation of operation <–40 oC and >80 oC No storage or operation is al-
Long term storage conditions 0 oC ... +40 oC Battery only up to +30 oC !
Short term storage, max. 24 h –40 oC ... +80 oC Cumulative for life–time of bat-
LCD operation –30 oC ... +70 oC Functions are delayed in low
+40 oC ... +60 oC Operational only for short peri-
ods
–40 oC ... –30 oC and
+60 oC ... +80 oC
Operation maybe not possible
but attempt to operate will
not damage the phone
lowed
tery
temperatures
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Functional Description
The US4RSM 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 US4RSM
The US4RSM 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.
Modes of Operation
US4RSM 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.
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System Module US4RSM
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.
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)
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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
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 US4RSM
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
Charger
Charge
control
PENTA
CCONT
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
US4RSM
ENGINE
6
Accessories
Bottom
connectorconnector
Mic
System Module US4RSM
User
28
22
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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System Module US4RSM
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.
CHAPS
VCHAR
BATTERY
Technical Documentation
VCXO
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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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 US4RSM
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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PAMS
System Module US4RSM
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
Technical Documentation
VCXO
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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Original 10/98
PAMS
NSC–1
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 US4RSM
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
Original 10/98
Page 3 – 17
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