Nokia 3100, 3120 Service Manual 06 rh19 rh50 bb troublesht

Nokia Customer Care

RH-19/RH-50 Series Cellular Phones

6 - Baseband Description and

Troubleshooting

Issue 3 05/2004  2004 Nokia Corporation. Page 1

Company Confidential

RH-19/RH-50 Company Confidential
6 - Baseband Description and Troubleshooting Nokia Customer Care

This page has been intentionally left blank

Page 2  2004 Nokia Corporation. Issue 3 05/2004

Company Confidential RH-19/RH-50

Nokia Customer Care 6 - Baseband Description and Troubleshooting

Table of Contents

Page No

Baseband Top-Level Description ..........................................................................................................5

Baseband block diagram ....................................................................................................................5

RH-19/RH-50 baseband feature list ...............................................................................................6

Environmental specifications ............................................................................................................6

Normal and extreme voltages.........................................................................................................6

Temperature conditions ....................................................................................................................6

Humidity................................................................................................................................................7

Frequencies in baseband ....................................................................................................................7

Printed wire board (PWB) ...................................................................................................................7

Baseband Architecture............................................................................................................................8

Baseband core .......................................................................................................................................8

Universal Phone Processor (UPP).................................................................................................... 8

Universal Energy Management (UEMK) .......................................................................................8

External flash and external SRAM.................................................................................................9

Energy management ............................................................................................................................ 9

Power supply modes ..........................................................................................................................9

Battery BL-5C/BR-5C.......................................................................................................................13

Power distribution............................................................................................................................13

DC characteristics ..............................................................................................................................16

Charging ................................................................................................................................................17

Audio circuitry .....................................................................................................................................17

Audio block diagram........................................................................................................................18

Earpiece ...............................................................................................................................................18

Microphones.......................................................................................................................................18

Integrated hands-free (IHF)...........................................................................................................19

Audio accessory receive path........................................................................................................19

Audio control signals.......................................................................................................................19

Acoustics ...............................................................................................................................................20

Earpiece acoustic..............................................................................................................................20

IHF speaker acoustics ......................................................................................................................20

Microphone acoustics .....................................................................................................................21

Vibra motor.........................................................................................................................................21

Audio modes ........................................................................................................................................22

Hand portable mode ........................................................................................................................22

Integrated hands-free audio mode..............................................................................................23

Headset audio mode ........................................................................................................................23

Loop set audio mode........................................................................................................................23

External hands-free audio mode..................................................................................................24

User Interface ..........................................................................................................................................25

LCD module ..........................................................................................................................................25

Baseband-LCD interface .................................................................................................................25

DC characteristics.............................................................................................................................25

Current consumption.......................................................................................................................27

Maximum ratings..............................................................................................................................27

AC characteristics.............................................................................................................................27

Reset timing .......................................................................................................................................29

Display power on/off sequence.....................................................................................................29

Issue 3 05/2004  2004 Nokia Corporation. Page 3

RH-19/RH-50 Company Confidential
6 - Baseband Description and Troubleshooting Nokia Customer Care

LED power supply ...............................................................................................................................30

Keypad ...................................................................................................................................................30

SIM Interface ...........................................................................................................................................32

BB-RF Interface.......................................................................................................................................33

Digital signals between BB and RF ................................................................................................33

Analog signals between BB and RF ...............................................................................................35

Voltage regulators in BB for RF ......................................................................................................37

System Connector Interface................................................................................................................40

System connector ...............................................................................................................................40

Accessory control interface (ACI) ..................................................................................................41

Signal flow on ACI line - ACI-ASIC accessory inserted .........................................................42

Signal flow on ACI line - Non ACI-ASIC accessory inserted................................................43

FBUS .....................................................................................................................................................44

VOUT (Accessory Voltage Regulator)...........................................................................................44

HookInt ..................................................................................................................................................45

Charging ................................................................................................................................................46

DC-plug................................................................................................................................................46

VCHAR pins of system connector.................................................................................................46

Voltages and currents .......................................................................................................................47

Baseband Calibration.............................................................................................................................48

Energy management calibration ....................................................................................................48

Calibration method with JBV-1....................................................................................................48

Calibration method without JBV-1 .............................................................................................49

LCD contrast tuning ...........................................................................................................................50

Baseband Testpoints ..............................................................................................................................52

List and description ............................................................................................................................52

Testpoints on bottom side ...............................................................................................................54

Testpoints on top side .......................................................................................................................55

Baseband Troubleshooting...................................................................................................................56

Top level flowchart ............................................................................................................................57

Phone is dead ......................................................................................................................................59

Flash faults ...........................................................................................................................................61

Phone is jammed ................................................................................................................................63

Charger ..................................................................................................................................................66

SIM card error .....................................................................................................................................67

Audio faults ..........................................................................................................................................68

Earpiece fault .......................................................................................................................................72

Display fault .........................................................................................................................................73

Keypad fault .........................................................................................................................................75

Selftest failure .....................................................................................................................................77

Active cover interface .......................................................................................................................78

Page 4  2004 Nokia Corporation. Issue 3 05/2004

Company Confidential RH-19/RH-50

A

Nokia Customer Care 6 - Baseband Description and Troubleshooting

Baseband Top-Level Description

THe RH-19/RH-50 product is a hand portable GSM850 (RH-50), EGSM900 (RH-19)
GSM1800 (RH-19/RH-50), GSM1900 (RH-19/RH-50) DCT-4 generation phone for the
expression segment, with optional active covers available.

The RH-19/RH-50 baseband consists of the DCT4 common baseband chipset having
some product specific blocks of its own, such as PopPortTM system connector, IHF and a

color display.

The baseband engine consists basically of two major ASIC's.

• The UEMK is the Universal Energy Management IC. It includes the analog audio cir­cuits, the charge control and voltage regulators. (The ‘K’ just provides the informa­tion that this is a shrunk version of the UEM. There is no difference in functionality
between UEM and UEMK)

• The UPP is the Universal Phone Processor and contains DSP, MCU and some internal
memory.

Baseband block diagram

The below system block shows the main BB function blocks.

PA Supply

UEM

SIM

Active

Cover I/F

EAR

Battery

Figure 1: Baseband block diagram

RF Supplies

UEMK

RF

RF RX/TX

Supplies

RF RX/TX

SIMIF

SLEEPCLK

32kHz

CBUS/
DBUS

BB

Clock

UPP

M

MIC

VIBRA

IHF

Audio

PA

External Audio

CI, Fbus, Vout

Charger Connection

System connector DC plug

system connector

DLIGHT
KLIGHT

Baseband

DC-

DC

Con-

verter

Keypad
Display

COMBO
Memory

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RH-19/RH-50 Company Confidential
6 - Baseband Description and Troubleshooting Nokia Customer Care

RH-19/RH-50 baseband feature list

Hardware characteristics:

• Single PWB design

• Universal Phone Processor UPP8Mv2.6 (RH-19) or UPP8Mv3.5 (RH-50) with 8Mbit
internal SRAM

• Additional external 4Mbit SRAM and 64MBit FLASH memory in one single package
(called Combo).

• Universal Energy Management ASIC UEMK (RH-19) or UEMK-edge (RH-50)

• GSM triple band 900/1800/1900 (RH-19) or 850/1800/1900 (RH-50)

• BR-5C / BL-5C battery

• Internal antenna assembled on IHF container

• Small SIM, supporting 1.8 & 3.0V

• Internal vibra motor

UI features:

• 130x130 pixel color display, 4096 colors

• Standard keypad with 4-way navigation key, two soft keys

• Illumination concept is based on a DC-DC converter

• Display: two white LED's

• Keypad: six white LED's

• Polyphonic ringing tones (MIDI)

• Internal hands-free

• Active Cover Connection

• AMR speech codec (RH-50 only)

Environmental specifications

Normal and extreme voltages

Following voltages are assumed as normal and extreme voltages for used battery:

• Nominal voltage: 3.7 V

• Lower extreme voltage: 3.2 V

• Higher extreme voltage (fast charging): 4.4 V

Temperature conditions

Operational temperature range (all specifications met within this range): -10°C..+55°C

Functional temperature range (reduced performance): -30°C..+70°C

Storage temperature range: -30°C..+85°C

Page 6  2004 Nokia Corporation. Issue 3 05/2004

Company Confidential RH-19/RH-50

Nokia Customer Care 6 - Baseband Description and Troubleshooting

Humidity

Relative humidity range is 5.....95%.

The BB module is not protected against water. Condensed or splashed water may cause
interim or permanent phone malfunction.

Any submerge of the phone most likely causes permanent damage.

Frequencies in baseband

There are several clock frequencies at the baseband part. Below table lists all available
frequencies. The asynchronous and diagnostic busses are not included.

Table 1: Frequency list

Frequency Context UPP UEMK Flash SIM Comment

52 MHz
26 MHz
13 MHz

3.25 MHz

Up to 1 MHz
1 MHz

32 kHz

1.2 kHz

1.625 / 6.5

Memory clock
RF clock
DBUS, RFBusClk
SIM

RFConvClk
CBUS

Sleep clock
ACI
Display IF

Printed wire board (PWB)

Characteristics of the PWB

• Single PWB

• 1.2 mm, 8 layer board

• Double sided assembled

• Through holes vias and buried vias are possible

The PWB is prepared for I-Line under filling of UEMK, UPP and the Flash (64 Mbit and
128 Mbit).

X
X
XX

X

X
X

X
X

X
X

X
X

X

XMIN. FREQ.

ESTIMATION

Frequency depends on SW

Issue 3 05/2004  2004 Nokia Corporation. Page 7

RH-19/RH-50 Company Confidential
6 - Baseband Description and Troubleshooting Nokia Customer Care

Baseband Architecture

Baseband core

Universal Phone Processor (UPP)

Main characteristics of the used UPP are:

• DSP by Texas Instruments, LEAD3 PH2+ Megacell 16 bit DSP core, 32 bit I/F - max.
speed 200 MHz.

• MCU based on ARM/Thumb 16/32 bit RISC MCU core - max. speed 50 MHz

• Internal 8 Mbit SRAM (PDRAM)

• General purpose USARTs

• SIM card interface

• Accessory interface (ACI)

• Interface control for: keypad, LCD, audio and UEMK control

• Handling of RF-BB interface

The UPP is housed in a 144-pin uBGA package (12x12mm, 0.8mm pitch).

In RH-19/RH-50 the UPP is clocked by a 26MHz frequency from the RF-chip "Mjoelner”.

This 26MHz-clock frequency is internally sliced down by UPP to 13MHz. This frequency is
then inside UPP multiplied to different frequencies, e.g. 145MHz for the DSP core.

UPP can operate on 4 different voltages; 1.05,1.3,1.5 and 1.8V. The voltage can be pro­grammed "on the fly" by the SW. For example in standby-mode, 1.3V is used for power
saving, but in active-mode (i.e. call) the voltages is increased to 1.8V to get maximum
performance.

Universal Energy Management (UEMK)

RH-19/RH-50 uses the UEMK version so called "UEMK". UEMK is a die shrunk version of
standard UEM's, but with the same functionality.

Main characteristics of UEMK's are:

• ACI support

• Audio codec

• 11 Channel A/D converter

• Auxiliary A/D converter

• Real time logic

• Baseband regulators

• RF regulators

• Voltage references needed for analogue blocks

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Nokia Customer Care 6 - Baseband Description and Troubleshooting

• 32 kHz crystal oscillator

• SIM interface and drivers

• Security logic

• Storage of IMEI code

• Buzzer and vibra motor drivers

•2 LED drivers

• Charging function

• RF interface converters

The UEMK is housed in a 168-pin uBGA package (12x12mm, 0.8mm pitch).

External flash and external SRAM

The Combo memory is a multi chip package memory which combines 64Mbit (4Mx16)
muxed burst multi bank Flash and 4Mbit muxed CMOS SRAM. These two dies are stacked
on each other in one package. The functionality of the Flash memory is the same, as it is
known from generic BB4.0 products.

The combo is supplied by single 1.8V for read, write and erase operation.

This Combo memory is housed in a 48-ball TBGA type with a 0.5mm ball pitch. The outer
dimensions are 10x8mm and the thickness is 1.1 mm.

Energy management

The energy management of RH-19/RH-50 is based on BB 4.0 architecture. A so called
semi fixed battery (BL-5C/BR-5C) supplies power primarily to UEMK ASIC and the RF PA.
UEMK includes several regulators to supply RF and baseband. It provides the energy
management including power up/down procedure.

Power supply modes

The functional behavior of the UEMK can be divided into 7 different states. Since the
UEMK controls the regulated power distribution of the phone, each of these states
affects the general functionality of the phone:

•No supply

• Backup

•Power off

• Reset

•Power on

• Sleep

•Protection

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RH-19/RH-50 Company Confidential
6 - Baseband Description and Troubleshooting Nokia Customer Care

Figure 2: UEMK state diagram

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Nokia Customer Care 6 - Baseband Description and Troubleshooting

The text below explains the state diagram. The symbol '' means that the voltage rises

and 'Ê' that the voltage drops. '→' Means the result of the conditions set on the left

most side.

VBAT < VMSTR and VBACK > V_BUCOFF → BACK_UP

VBAT < V

VBAT  V

VBAT > V

VBAT  V

PWRONX = '0' or VCHAR  VCHAR

VBAT > V

DELAY2 elapses → DELAY3

VBAT > C

DELAY4 elapses → PWR_ON
SLEEPX = '0' → SLEEP
SLEEPX = '1' → PWR_ON

VBAT  V

No change

VBAT > V

MSTR and VBACK < V_BUCOFF → NO_SUPPLY

MSTR+ and VBACK < V_BUCOFF → DELAY1

MSTR and DELAY1 elapses → RESET

MSTR+ and VBACK > V_BUCOFF → DELAY1

DET+

or ALARM = '1' → DELAY1

COFF+ → DELAY2

OFF+. and DELAY3 elapses → DELAY4

COFF and VBAT > VMSTR- → PWR_OFF

MSTR → Stay in

PWR_OFF

PWRONX  detection during
DELAY2

Watchdog elapses (approx. 100 (µs) → PWR_OFF
Thermal shutdown → PWR_OFF
PwrKeyWatchdog (4 sec.) elapses → PWR_OFF

→ PWR_OFF

The different states of the UEMK are detailed in the sections below.

Note: RH-19/RH-50 does not have a backup battery.

No Supply

In the NO_SUPPLY mode the UEMK has no supply voltage (VBAT < V
V_BU

). This mode is due to the fact that both the main battery is either discon-

COFF-

nected or discharged to a low voltage level.

The UEMK will recover from NO_SUPPLY into RESET mode if the VBAT voltage level rises
above the V

level by either reconnecting the main battery or charge it to such level.

MSTR+

and VBACK <

MSTR

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6 - Baseband Description and Troubleshooting Nokia Customer Care

Backup

In BACK_UP mode the main battery is either disconnected or has a low voltage level
(VBAT < V

and VBACK > V_BU

MSTR-

COFF+

).

The regulator VRTC that supplies the real time clock is disabled in BACK_UP mode.
Instead the unregulated backup battery voltage VBACK supplies the output of the VRTC.
All other regulators are disabled and the phone has no functionality.

The UEMK will recover from BACK_UP mode into RESET mode if VBAT rises above V

Power Off

In order for the UEMK to be in PWR_OFF mode, it must have supply voltage (VBAT >
V

The regulator VRTC regulator is enabled and supplying the RTC within the UEMK. The
UEMK will enter RESET mode after a 20 ms delay whenever one of the below listed con­ditions is logically true:

• The power button is activated

• Charger connection is detected

• RTC alarm is detected

The UEMK will enter PWR_OFF from all other modes except NO_SUPPLY and BACK_UP if
the internal watchdog elapses.

Reset

When the UEMK enters RESET mode from PWR_OFF mode the watchdog is enabled. If
the VBAT fails to rise above the power-up voltage level V

dog elapses, the UEMK will enter PWR_OFF mode. Otherwise after a 200 ms delay the

regulator VFLASH1 will be enabled and after an additional delay of 500 µs the regulators

VANA, VIO, VCORE and VR3 will be enabled. All other regulators i.e. VFLASH2, VSIM, VR1,
VR2 and VR4 - VR7 are software controlled and disabled by default. After an additional
delay of 20 ms the UEMK enters PWR_ON mode.

MSTR+

.

MSTR+

).

(3.1 V) before the watch-

COFF+

Power On

In PWR_ON the UEMK is fully functional in the sense that all internal circuits is powered
up or can be by means of software. The UEMK will enter PWR_OFF mode if VBAT drops
below V

for a period of time longer than 5 µs. The UEMK will furthermore enter

COOF-

PWR_OFF mode if either of the watchdogs Operational State Machine (approx. 100 µs),

Security (32 sec.) or Power Key (4 sec.) elapses or if any of the regulators triggers the
thermal protection circuitry

Sleep

The UEMK can be forced into SLEEP mode by the UPP by setting the input SLEEPX low for

more than 60 µs. This state is entered when the external UPP activity is low (phone in

sleep) and thereby lowering the internal current consumption of the UEMK. The regulator
VANA is disabled and VR1 - VR7 are either disabled or in low quiescent mode.

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Nokia Customer Care 6 - Baseband Description and Troubleshooting

From SLEEP the UEMK enters PWR_ON if SLEEPX goes high, PWR_OFF mode if watchdog
elapses or BACK_UP mode if VBAT drops below V

MSTR-

.

Protection mode

The UEMK has two separate protection limits for over temperature conditions, one for
the charging switch and one for the regulators. The temperature circuitry measures the
on-chip temperature. In case of charging over temperature, the circuit turns the charg­ing switch off. In case of over temperature in any of the regulators, the UEMK powers
off.

Battery BL-5C/BR-5C

Product RH-19/RH-50 uses the so called "case less" Li Ion battery BL-5C/BR-5C.

Type Capacity Manufacturer BSI Value

BL-5C 850 mAh Many sources 75 kOhm

BR-5C 820mAh Sanyo 75 kOhm

BR-5C 820mAh Matsushita 47 kOhm

Main advantage of case less battery types is the overall size, particular the thickness and
the number of contact terminals.

These batteries have a three-pin connector (BTEMP is not used). The battery does not
support temperature measurement inside battery pack. In order to get temperature
information of the battery, a NTC is mounted on the PWB within the BB area.

Ni based batteries are not supported by RH-19/RH-50.

Power distribution

Under normal conditions, the battery powers the baseband module. Individual regulators
located within the UEMK regulate the battery voltage VBAT. These regulators supply the
different parts of the phone. 8 regulators are dedicated to the RF module of the phone,
and 6 to the baseband module.

The VSIM regulator is able to deliver both 1.8V and 3.0V DC and thus supporting two dif­ferent SIM technologies. A register internally in the UEMK controls the output of VSIM
and can be written to by the MCU via the CBUS.

The regulator VCORE is likewise adjustable and controlled by registers written by the

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RH-19/RH-50 Company Confidential
6 - Baseband Description and Troubleshooting Nokia Customer Care

MCU. VCORE supplies the core of the UPP and can be adjusted on the fly by the MCU if
DSP capacity is inadequate. Higher VCORE supply (1.8 V) results in faster core operations
in the UPP.

The regulator VFLASH2 supplies audio circuitry and is controlled by the MCU

Regulators VANA, VFLASH1 and VIO are solely controlled by the UEMK and cannot be
enabled or disabled by the MCU. Furthermore, VFLASH1 and VIO are both ON, though in

low quiescent mode when phone is in sleep mode. An output current of 500 µA can be

drawn from the regulators. VIO supplies the UPP, FLASH and LCD, VFLASH1 supplies the
LCD module, VANA is supplying analogue parts internally in the UEMK as well as the
baseband audio circuitry and pull-up resistors on the input of the UEMK slow AD con­verters.

System connector provides a voltage to supply accessories. The white LED's need a higher
voltage supply as the battery can provide in bad condition. Separate external regulators
supply both consumers.

The regulators VR1A, VR1B, VR2 - VR7 and IPA1 - IPA4 are controlled by the DSP via
the DBus. VR4 - VR7 are controlled by the UEMK as well and are disabled in sleep regard­less of DSP writings.

VBAT is furthermore distributed, unregulated, to the RF power amplifier, audio power
amplifier and external baseband regulators.

The CHACON module in the UEMK controls the charging of the main battery. Further­more it contains a 3.2 Vdc regulator for charging of the backup battery and a 1.8 Vdc
regulator supplying the internal real time clock.

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V

Nokia Customer Care 6 - Baseband Description and Troubleshooting

Figure 3: Baseband power distribution

Battery

Baseband

UEMK

RF Regulators

Baseband
Regulators

RTC

BAT

LED
regulator

ACC
regulator

PA Supply

CHACON

VOUT

Tomahawk System Connecto

PopPortTM System Connector

VR1A
VR1B

VR2-7

VSIM

VCORE

VANA

VIO

VFLASH1

VFLASH2

6

IHF PA

SIM

UPP

FLASH

LCD

Backup

battery

LED

Keyboard/displa y

Active
Cover

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6 - Baseband Description and Troubleshooting Nokia Customer Care

DC characteristics

The following table reflects the specifications of voltage and current regulators within
the UEMK:

Table 2: UEMK regulator outputs

Output Voltage (V) Output Current

Regulator Target

Min Typ Max Min Max

VR1A RF 4.6 4.75 4.9 0 10

(mA)

VR2

4

RF 2.70 2.78 2.86 0.1 100

VR3 RF 2.70 2.78 2.86 0.1 20

VR4 RF 2.70 2.78 2.86 0.1 50

0.1

1

VR5, VR6

RF 2.70 2.78 2.86 0.1 50

0.1

VR7 RF 2.70 2.78 2.86 0.1 45

VrefRF01 RF 1.334 1.35 1.366 - 0.1

VIO

VSIM

1

2

BB 1.72 1.8 1.88 0.005

0.005

BB 1.745

2.91

1.8

3.0

1.855

3.09

0.005

0.005

150

0.500

25

0.500

VANA BB 2.70 2.78 2.86 0.005 80

VCORE

2

BB 1.000

1.235

1.425

1.710

0.974

1.215

1.410

1.692

1.053

1.3

1.5

1.8

1.053

1.3

1.5

1.8

1.106

1.365

1.575

1.890

1.132

1.365

1.575

1.890

0.005

0.005

0.005

0.005

70
85
100
120

70
85
100
120

200
200
200
200

VFLASH1 BB 2.70 2.78 2.86 0.005

0.005

3

VFLASH2

BB 2.70 2.78 2.86 0.005 40

1

The second current value indicates the maximum possible output current of the regulator

when in low quiescent mode.

2

The output voltages are split into two different current categories. The upper part is the low-

er range of output current, and the lower part is the higher range of output current.

3

Condition in sleep-mode depends on MCU writings to UEMK regulator register solely.

4

Condition in sleep-mode depends on DSP writings to UEMK register.

70

1.5

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Nokia Customer Care 6 - Baseband Description and Troubleshooting

Charging

The charging of the main battery is controlled by the UEMK. External components are
needed in order to sense charging current and voltage that are needed by the Energy
Management (EM) software and to protect against EMC into the baseband area. The
charger is connected to the phone via the DCT3 bottom connector or the charger pads of

the PopPortTM system connector.

Figure 4: Charging configuration

Transceive

0R22

1u

10n

Connecting a charger to the telephone creates a voltage, VCH, on the UEMK VCHAR
input. When the VCH level is detected to rise above the VCH

CHACON, charging starts.

3-wire chargers can be connected, but the PWM is not supported.

In order to protect the phone from damage due to over voltage caused by a sudden bat­tery removal while charging proceeds, the charger switch is closed immediately.

Audio circuitry

This section describes the audio-HW inside the BB. Thus e.g. external audio components
and acoustics are not considered with the details in this section.

UEMK

VBATREGS

CHACON

Charger

VCHARINVCHAROUT

PWM

VCHAR

1n

33R/100MHz

VCHAR

1.5A

GND

threshold (2.0 Vdc) by

DET

The main topology comes from other phones using BB4.0 engine, where the audio-HW is
mostly integrated into the UEMK-ASIC. The biggest difference is that RH-19/RH-50 has
also integrated hands-free (IHF).

Issue 3 05/2004  2004 Nokia Corporation. Page 17

RH-19/RH-50 Company Confidential
6 - Baseband Description and Troubleshooting Nokia Customer Care

Audio block diagram

Figure 5: Audio block diagram

UPP

EARDATA
MICDATA

GENIO14

GENTEST0
FBUS_TX
FBUS_RX

UEMK

EARDATA
MICDATA

VIBRA

MICB1

MIC1P
MIC1N

EARP
EARN

HOOKINT

MICB2

MIC2P
MIC2N

HF
HFCM

XEAR

internal microphone path

earpiece path

accessory transmit path

accessory receive path

IHF speaker path

+

On/Off

IHF Amplifier

M

J103 ProdTP6

VBAT

Internal Microphone

Earpiece

XMICP
XMICN

XEARP
XEARN

Tomahawk Connector

IHF Speaker

DAI I/F

Earpiece

RH-19/RH-50 uses an earpiece which is also referred to as "PICO speaker". This is a 32
ohm speaker with the diameter of 8 mm.

Earpiece is fed by the differential signals "EARP" & "EARN" from UEMK. The signals run
quite directly from UEMK to the earpiece, only some passive ands EMC protection com­ponents are needed.

The external earpiece signals are fed by the "HF" & "HFCM" pins.

The level (swing) of earpiece-signals can be adjusted by register values inside UEMK.
These signals have common voltage level of 1.35 V (0.8 V for HF) at UEMK pins.

Microphones

An EMC-improved type of microphone is used as internal microphone in RH-19/RH-50,
diameter of which is 2.2mm.

Internal microphone circuitry is driven single ended. Microphone needs bias voltage,

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Nokia Customer Care 6 - Baseband Description and Troubleshooting

which is provided by UEMK and is fed through a resistor to the microphone. A resistor is
also needed to the other side of the microphone, i.e. between microphone and GND, in
order to provide the differential signals to UEMK. Audio signals are AC-coupled from the
microphone.

For the external microphone a differential input is used.

MIC1N & MIC1P (audio signals) and MICB1 (bias voltage) are used for the internal
microphone. MIC2N & MIC2P and MICB2 are used for external microphone.

Integrated hands-free (IHF)

The speaker used for IHF is a 16 mm diameter speaker with 8 Ohm impedance, and is also
known as "MALT" speaker.

IHF circuitry uses differential outputs from UEMK.

Depending on the audio mode the IHF amplifier is driven either from UEMK HF / HFCM or
XEAR audio outputs. The IHF audio power amplifier (APA) LM4890 has a bridge-tied-load
(BTL) output in order to get the maximum use of supply voltage. The supply voltage for
driving circuitry of speaker is VBAT, thus the swing across the speaker is ±VBAT.

The shutdown of the IHF PA is controlled by UPP using GENIO14.

Audio accessory receive path

In RH-19/RH-50 the accessory receive path is directly driven from UEMK HF / HFCM dif­ferential audio outputs, the output signal complies with the PopPortTM accessory inter-

face.

For EMC protection ferrites are connected in series to the earpiece, for ESD protection
varistors are used.

Audio control signals

Furthermore, a couple of signals are needed to control the external audio device.

The HEADINT signal is needed for recognizing the external device (e.g. headset) con­nected to the system. The recognition is based on the ACI-pin on the system connector,
which is shorted to ground inside the external device.

The button of the external device generates HOOKINT. This is used e.g. to answer or to
end a phone call.

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6 - Baseband Description and Troubleshooting Nokia Customer Care

Acoustics

Earpiece acoustic

RH-19/RH-50 uses the so called "PICO" earpiece.

This earpiece is mounted into the UI-shield assembly, the sealing of the back and front
volume are implemented in the UI-shield by die casting. This sealing part also provides
the sealing against the A-cover.

Figure 6: Earpiece implementation

IHF speaker acoustics

As mentioned, the so called "MALT" speaker is used in RH-19/RH-50 for integrated
hands-free and ringing tone applications.

The IHF speaker is mounted to the IHF enclosure by means of the speaker adhesive. The
IHF enclosure provides the needed back volume for the speaker. The IHF enclosure is
closed with the IHF lid, which is carrying the IHF pins to contact the IHF speaker.

The sealing of the effective acoustic volumes is achieved with the enclosure adhesive,
which glues the IHF lid to the IHF enclosure.

To provide a long-term reliability additionally the IHF lid is heat stacked to the IHF enclo­sure.

The B-cover gasket provides a fitting between the B-cover and the IHF enclosure. This
fitting is attached with an adhesive to the IHF enclosure and also includes a dust and

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Nokia Customer Care 6 - Baseband Description and Troubleshooting

water shield to protect the speaker inside from dust and swarf.

Due to the fact that the IHF enclosure is also carrying the antenna radiator, the whole
assembly is named antenna assembly.

Due to heat stacking of the antenna assembly, it cannot be disassembled and in case of
failure only be exchanged as one complete assembly.

Figure 7: Exploded view of antenna assembly

Microphone acoustics

A standard microphone module is used. This module is embedded into a so called "rubber
boot" and connected to RH-19/RH-50 system module by spring contacts.

The microphone is placed close to the system connector. The sound port of the micro­phone is located towards the bottom of the phone

Vibra motor

A vibrating alerting device is used to generate a vibration signal for an incoming call.

This vibra is located in the bottom section of the phone.

The vibrator is driven by the UEMK output VIBRA, and controlled with a PWM signal. The
supply of the vibra is taken from the battery voltage of the phone.

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RH-19/RH-50 Company Confidential
6 - Baseband Description and Troubleshooting Nokia Customer Care

Audio modes

There are six different audio configurations. These can create following audio modes:

•Hand portable

• Integrated hands-free

• Headset

• Loop set

• External hands-free

The following audio sources have to be routed according to the active audio mode:

• Speech

• Ringing tones / SMS tones

• Keypad tones

• Error tones / Warning tones

• Game tones

Hand portable mode

In hand portable mode earpiece path and internal microphone path are in use. The audio
sources are routed according to the following table:

Table 3: Handportable mode audio routing

Audio Source Earpiece

Speech X X

Ringing tones, SMS tones X

Keypad tones X

Warning / Error tones X

Game tones X

Internal
Microphone

IHF
speaker

Accessory
receive path

Accessory
transmit path

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Nokia Customer Care 6 - Baseband Description and Troubleshooting

Integrated hands-free audio mode

In integrated hands-free mode IHF path and internal microphone path are used. The
audio sources are routed according to the following table:

Table 4: IHF mode audio routing

Audio Source Earpiece

Speech X X

Ringing tones, SMS tones X

Keypad tones X

Warning / Error tones X

Game tones X

Internal
Microphone

Headset audio mode

In headset mode accessory receive path and accessory transmit path are used. RH-19/
RH-50 supports the following headsets:

• HDB-4: mono headset, boom design

• HS-1C: camera headset

• HS-10: retractable headset

• HSU-3: privacy headset

• HS-5: mono headset traditional design (RH-50 only)

• HS-2R: FM radio headset (RH-50 only)

IHF
speaker

Accessory
receive path

Accessory
transmit path

The audio sources are routed according to the following table:

Table 5: Headset mode audio routing

Audio Source Earpiece

Speech X X

Ringing tones, SMS tones X X

Keypad tones X

Warning / Error tones X

Game tones X

Internal
Microphone

IHF
speaker

Accessory
receive path

Loop set audio mode

In loop set mode accessory receive path and accessory transmit path are used. RH-19/

Accessory
transmit path

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RH-19/RH-50 Company Confidential
6 - Baseband Description and Troubleshooting Nokia Customer Care

RH-50 supports the loop set LPS4.:

Table 6: Loop set mode audio routing

Audio Source Earpiece

Speech X X

Ringing tones, SMS tones X X

Keypad tones X

Warning / Error tones X

Game tones X

Internal
Microphone

IHF speaker

Accessory
receive path

External hands-free audio mode

In external hands-free mode accessory receive path and accessory transmit path are
used. RH-19/RH-50 supports external hands-free accessories:

BHF-1: basic car hands-free kit

HFU-4: advanced car hands-free kit

Table 7: External hands-free mode audio routing

Audio Source Earpiece

Internal
Microphone

IHF speaker

Accessory
receive path

Accessory
transmit path

Accessory
transmit path

Speech X X

Ringing tones, SMS tones X

Keypad tones X

Warning / Error tones X

Game tones X

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