Nokia 3105 Service Manual 10rh48sysmod
CCS Technical Documentation
RH-48 Series Transceivers
System Module
Issue 1 11/2003 Confidential ©2003 Nokia Corporation
RH-48
System Module CCS Technical Documentation
Contents
Transceiver RH-48......................................................................................................... 3
Introduction ..................................................................................................................3
Operational Modes .......................................................................................................3
Baseband Module ........................................................................................................3
UEM.......................................................................................................................... 4
BB-RF Interface Connections ......................................................................................6
UPP............................................................................................................................ 9
NOR Flash Memory and SRAM............................................................................. 10
User Interface Hardware ............................................................................................10
LCD......................................................................................................................... 10
Keyboard................................................................................................................. 10
Power Key............................................................................................................... 10
Lights....................................................................................................................... 10
Vibra........................................................................................................................ 11
Audio Hardware .........................................................................................................11
Earpiece................................................................................................................... 11
Microphone ............................................................................................................. 11
MIDI Speaker.......................................................................................................... 11
Audio Amplifier Interface....................................................................................... 12
Battery ........................................................................................................................12
Phone Battery.......................................................................................................... 12
Battery Connector ................................................................................................... 13
Accessories Interface .................................................................................................13
System connector .................................................................................................... 13
Charger IF ............................................................................................................... 15
Test Interfaces ............................................................................................................16
Production Test Pattern........................................................................................... 16
General Information about Testing ............................................................................18
Phone Operating Modes.......................................................................................... 18
RF Module .................................................................................................................19
Requirements........................................................................................................... 19
Antenna ................................................................................................................... 19
Transmitter.............................................................................................................. 19
Synthesizer.............................................................................................................. 20
Receiver................................................................................................................... 22
Page 2 ©2003 Nokia Corporation Confidential Issue 1 11/2003
RH-48
CCS Technical Documentation System Module
Transceiver RH-48
Introduction
The RH-48 is available as a CDMA single-band engine (800 MHz CDMA).
Operational Modes
There are several different operational modes: Modes have different states controlled by
the cellular SW. Some examples are: Idle State (on ACCH), Camping (on DCCH), Scanning, Conversation, No Service Power Save (NSPS) previously OOR = Out of Range.
In the power-off mode, only the circuits needed for power-up are supplied.
In the idle mode, circuits are powered down and only the sleep clock is running.
In the active mode, all the circuits are supplied with power, although some parts might
be in 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 fast charge and the maintenance mode.
The local mode is used for alignment and testing.
Baseband Module
The core part of the RH-48 baseband module consists of two ASICs — UEM and UPP —
and combo memory. The following sections describe these parts.
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UEM
UEM Introduction
UEM is the Universal Energy Management IC for DCT4 digital handportable phones. In
addition to energy management, it performs all the baseband mixed-signal functions.
Most of UEM pins have 2kV ESD protection. Those signals that are considered to be
exposed more easily to ESD have 8kV protection inside UEM. Such signals are all audio
signals, headset signals, BSI, Btemp, Fbus, and Mbus signals.
Regulators
UEM has six regulators for baseband power supplies and seven regulators for RF power
supplies. RH-48 has a DC/DC connector to provide power to the UPP VCORE.
Bypass capacitor (1uF) is required for each regulator output to ensure stability.
Reference voltages for regulators require external 1uF capacitors. Vref25RF is reference
voltage for VR2 regulator; Vref25BB is reference voltage for VANA, VFLASH1, VFLASH2,
VR1 regulators; Vref278 is reference voltage for VR3, VR4, VR5, VR6, VR7 regulators;
VrefRF01 is reference voltage for VIO, VCORE, VSIM regulators, and for RF.
Figure 1: Baseband module diagram
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CCS Technical Documentation System Module
BB RF
VANA: 2.78V typ 80mA max VR 1a: 4.75V 12mA max
Vflash1: 2.78V typ 70mA max
Vflash2: 2.78V typ 40mA max VR2: 2.78V 100mA max
VSim: 1.8/3.0V 25mA max VR3: 2.78V 20mA max
VIO: 1.8V typ 150mA max VR4: 2.78V 50mA max
Vcore: 1.0-1.8V 100mA max VR5: 2.78V 50mA max
VR6: 2.78V 50mA max
VR7: 2.78V 45mA max
VANA regulator supplies internal and external analog circuitry of BB. It is disabled in
sleep mode.
Vflash1 regulator supplies LCD and digital parts of UEM ASIC. It is enabled during startup
and goes to low Iq-mode in sleep mode.
VIO regulator supplies both external and internal logic circuitries. It is used by LCD, flash,
Jedi, Yoda, and UPP. Regulator goes in to low Iq-mode in sleep mode.
VCORE supplies DSP, Core part of UPP. Voltage is programmable and the startup default
is 1.5V. Regulator goes to low Iq-mode in sleep mode. VCORE is supplied by DC/DC (the
internal regulator is not used).
VR1 regulator (VR1a) uses two LDOs and a charge pump. VR1a is used to bias cellular PA.
VR2 is a linear regulator used to supply Jedi RF ASIC.
VR3 is a linear regulator used by Yoda RF ASIC and VCTCXO circuitry.
VR4 is a linear regulator used by Alfred’s LNA RF front end ASIC circuitry.
VR5 is a linear regulator used by Jedi RFIC.
VR6 is a linear regulator used by Yoda RFIC
VR7 is a linear regulator used by synthesizer and VCO circuits on both Jedi and Yoda RFIC
RF Interface
In addition to the RF regulators mentioned, UEM handles the interface between the
baseband and the RF section. It provides A/D and D/A conversion of the in-phase and
quadrature receive and transmit signal paths, and also A/D and D/A conversions of
received and transmitted audio signals to and from the UI section. The UEM supplies the
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System Module CCS Technical Documentation
analog AFC signal to the RF section according to the UPP DSP digital control. It also converts PA temperature into real data for the DSP. The UPP controls the RFIC through the
3-wire RFIC bus. UPP also provides PDM regulator for RF interface (RX/TX AGC control).
Charging Control
The CHACON block of UEM asics controls charging. Needed functions for charging controls are pwm-controlled battery charging switch, charger-monitoring circuitry, battery
voltage monitoring circuitry and RTC supply circuitry for backup battery charging. In
addition, external components are needed for EMC protection of the charger input to the
baseband module. The DCT4 baseband is designed to electrically support both DCT3 and
DCT4 chargers.
Digital Interface
Data transmission between the UEM and the UPP is implemented using two serial connections, DBUS (9.6 MHz) for DSP and CBUS (1.2 MHz in CDMA) for MCU. UEM is a dualvoltage circuit: the digital parts are running from 1.8V and the analog parts are running
from 2.78V. Vbat (3.6V) voltage regulators inputs also are used.
Audio Codec
The baseband supports two external microphone inputs and one external earphone output. The inputs can be taken from an internal microphone, from a headset microphone,
or from an external microphone signal source through a headset connector. The output
for the internal earpiece is a dual-ended type output, and the differential output is capable of driving 4Vpp to the earpiece with a 60 dB minimum signal to total distortion ratio.
Input and output signal source selection and gain control is performed inside the UEM
ASIC according to control messages from the UPP. Both a buzzer and an external vibra
alert control signals are generated by the UEM with separate PWM outputs.
MIDI
The MIDI audio signal generated by the DSP and UEM audio CoDec is routed to the XEAR
output of the UEM. An audio amplifier (LM4890) is used to boost enough power for the
speaker.
UI Drivers
The vibra, display LED, and keyboard LEDs are driven by open collector output drivers
inside UEM. These drivers can generate PWM square wave signals to these devices.
AD Converters
There is an 11-channel analog-to-digital converter in UEM. The AD converters are calibrated in the production line.
BB-RF Interface Connections
All the signal descriptions and properties in the following tables are valid only for active
signals.
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Table 1: PDM Interface
Signal name From To Parameter Min Typ Max Unit Function
RX_IF_AGC UPP
GenIO 9
TX_IF_AGC UPP
GenIO 7
TX_RF_AGC UPP
GenIO 26
Signal
name
TX_Gate UPP
From To Parameter Input characteristics Function
Gen IO 8
pullup
Yoda Voltage Min
Max
---------------Clk Rate
Jedi Voltage Min
Max
---------------Clk Rate
Jedi Voltage Min
Max
---------------Clk Rate
Table 2: General I/O Interface
Jedi and PA
Gating
Transistors
“0” Transmitter Off
“1” Transmitter On
Timing Accuracy
(1)
0.0
1.75
--------
(1)
0.0
1.75
-------
0.0
1.75
--------
(3)
1.8
------
9.6
1.8
-------
9.6
1.8
--------
9.6
1.38 1.88 V
0 0.4 V
4 chips, and can be up to
a total of 255 chips
0.1
1.86
-------
19.2
0.1
1.86
--------
19.2
0.1
1.86
--------
19.2
V
-------MHz
V
-------MHz
V
-------MHz
Controls gain of VGA r
in receiver
Controls gain of VGA in
IF VGA
Controls gain of TX
driver
Punctures the PA’s and the
Jedi ASIC
Digital Into RF
D0 UPP
Gen IO 10
D1 UPP
Gen IO 13
D2 UPP
Gen IO 12
PMIC Voltage Min
Max
PMIC Voltage Min
Max
PMIC Voltage Min
Max
0.4V max
1.72V-1.86V
0.4V max
1.72V-1.86V
0.4V max
1.72V-1.86V
Enable PMIC
Set PMIC output voltage
Set PMIC output voltage
Table 3: VCTCXO Interface
Signal name From To Parameter Min Typ Max Unit Function
19.2M_UPP Yoda UPP Frequency
-----------------------Signal amplitude
AFC UEM VCTCXO Voltage Min
Max
------------------------Settling time
(4)
-------
0.5
0.0
2.4
------- -------
19.2
-------
1.0
-------
1.5
0.1
2.55
-------
0.2
MHz
-------
Vpp
V
------ms
High stability clock
signal for logic circuits, AC coupled
sinewave.
Automatic frequency control signal
for VCTCXO
Digital Into RF
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