Nokia 1508I Manual de usuario

1508i(RM-430)

Baseband Description and Troubleshooting

Nokia Customer Care

Issue 1

Nokia Customer Care

1508i (RM-430)

Mobile Terminal

Baseband Description and

Troubleshooting

1508i(RM-430)

Baseband Description and Troubleshooting

Nokia Customer

Care

Issue 1

Contents

BB Troubleshooting 1508i

1508i(RM-430)

Baseband Description and Troubleshooting

Nokia Customer

Care

Issue 1

1508i system brief introduction

1508i main features

1508i is a CDMA phone based on the VIA platform.

1) CDMA PCS support only

2) FM stereo radio

3) Compliance to USB 2.0 (full speed)

4) R-UIM card

The main devices

Device Model number Supplier

Baseband processor CBP 5.6 VIA

PMU ACT5805 Active

Memory S71GL064NB0BFW0Z0 SPANSION

LCD BYD4205T BYD

FM Stereo radio Si4702-B16-GM SILICON LABS

1508i(RM-430)

Baseband Description and Troubleshooting

Nokia Customer

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Issue 1

Figure 1 Component layout (Bottom)

1508i(RM-430)

Baseband Description and Troubleshooting

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System Block Diagram

System Description

1508i is a CDMA (PCS band) Mobile Phone. The phone supports:

- forward and reverse link data rates of up to 153.6kbps.

- 4GV vocoder

- 1.47”(128*128) CSTN LCD

- Stereo FM radio

Platform Introductions

CBP 5.6

VIA Telecom’s CBP 5.6 single-chip CDMA Base Band

Processors provide a complete 3G CDMA2000® 1X

(Release 0) solution. They are designed to meet or exceed

1508i(RM-430)

Baseband Description and Troubleshooting

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the specifications of mobile stations for worldwide 3G CDMA

systems as specified by CDMA2000® 1X (Release 0)

standards and are backward-compatible to IS -95.

CBP 5.6 integrates three processor subsystems:

ARM7TDMI® Control Processor (CP) supports the protocol

stack, user interface, and hardware interface processing.

Two TeakLite® Digital Signal Processors (DSPs): one DSP

supports CDMA modem processing, the second DSP

supports CDMA voice processing

The main features of the CBP 5.6

zSupports CDMA2000® 1X (Release 0)

zBackward compatible to IS-95 standards

zSupports IS-2000 Quick Paging Channel for improved standby time

zSupport for multiple CDMA band classes (Band Class 0/US-Cellular,

Band Class 1/US-PCS, Band Class 3/JTACS, Band Class 4/Korean-

PCS); support for additional band classes which can be added upon

customer request

zSpecial purpose logic provides signal processing, modulation,

demodulation, hardware accelerators and interfaces for keypad and

display

zMixed signal circuitry for the Rx analog-to-digital converter (ADC), Rx

filter, Tx digital-to-analog converter (DAC), Tx filter, internal PLLs,

voice codec, auxiliary ADCs, auxiliary DACs, RF control and 32.768

kHz oscillator

zSupport for forward and reverse link data rates of up to 153.6 kbps

(CBP5.6 only).

z Dual supply voltage (1.8 V digital core, 3.0 V analog and 3.0 V digital

I/O)

z3.0 V or 1.8 V external memory interface

1508i(RM-430)

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zUSB support (12 Mbps)

zRemovable User Identity Module (R-UIM) compliant with IS-820

z32-voice polyphonic ringer

1508i(RM-430)

Baseband Description and Troubleshooting

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The interface of the CBP5.6 is described in the following

diagram. Receive and transmit interfaces for CBP 5.6

provide analog I and Q signals and support super-

heterodyne radio and direct conversion radio design. The

CP external-memory interface supports 3.0V or 1.8V, the

address bus supports 16-bit address which can support

three to six external devices via chip selects. CBP 5.6

includes 48 GPIOs and interrupts, some of which are

multiplexed with other functions. All GPIO pins are in input

state by default and use a large pull-up or pull-down resistor

value to minimize the current drain. The USB port supports

data rates of up to 12Mbps, the USB analog drivers and

48.00MHz PLL are integrated into CBP 5.6, the control

processor manages the USB function. Two independent

serial-peripheral interfaces are provided on CBP 5.6: one is

for RF control and the other is for general-purpose use. The

R-UIM interface supports 3V UIM cards and consists of five

pins, these pins are multiplexed with another function. The

CP manages the R-UIM function.

Five independent PDM DACs are supplied on the CBP 5.6

chip.

Three of the outputs are dedicated to radio-control signals

for Rx automatic gain control (AGC), Tx AGC, and automatic

frequency control (AFC). The fourth and fifth PDM outputs

are spares. The PDMs are 12-bit DACs and have a

guaranteed output range of 0.2 V to 2.5 V.

The 12-bit auxiliary ADC supports eight independent

external channels on pins AUXADC [7:0]. There are also

eight internal channels used to measure internal analog

voltages. The input voltage range is 0.2 V to 2.7 V. The

conversion time is 156 µsec. The typical uses of the external

1508i(RM-430)

Baseband Description and Troubleshooting

Nokia Customer

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auxiliary ADC channels include: Tx RF power measurement,

battery voltage, and temperature sensors.

The baseband is powered by the following PMU ACT5805 regulators:

VDD_DIG = 3.0v

VDD_CORE = 1.8v

VDD_TXPLL = 3.0v

VDD_TCXO = 3.0v

VDD_ANALOG =3.0v

VDD_RX = 3.0v

VDD_TX = 3.0v

VIB_P=2.8v~3.6v

1508i(RM-430)

Baseband Description and Troubleshooting

Nokia Customer

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Power Up

The mobile terminal uses the power key and a charger to power up.

Power Key

When the power key is pressed, the PMU enters the power-up sequence.

Pressing the power key causes the POWER_ON pin to VBAT. The

POWER_ON signal is not part of the keypad matrix. The power key is

connected to the PMU. This means that when the power key is pressed, an

interrupt will be generated to the CBP in order to power on the CBP. The CBP

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