Functions Of The Pcba - Huawei Ascend Maintenance Manual

Y210 Mobile Phone
Maintenance Manual
The PM8029 is mainly responsible for:
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The RTR6285A is the radio frequency (RF) signal processing chip, responsible for converting
Universal Mobile Telecommunications System (UMTS)/GSM uplink/downlink RF signals
and using I/Q signals to exchange data with the baseband chip.

9.1.1 Functions of the PCBA

By function, the PCBA can be divided into four subsystems: baseband, RF, power, and user
interface subsystems. Table 9-1 describes the subsystems' modules and units, as well as their
functions.
Table 9-1 PCBA subsystems' modules, units, and their functions
Subsystem Module
Baseband MSM7225A
subsystem
Issue 1.0 (2012-11-28)
Detecting the connection and disconnection of the external power supply.
Supplying power to the phone.
Providing analog multi-channel switch, real-time clock circuit, temperature compensated
crystal oscillator (TCXO) clock circuit, motor driver circuit, and speaker driver circuit.
Unit
Modem subsystem
Application subsystem
User interface processing unit
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9 Principles and Failure Analysis
Function
The modem subsystem includes the
ARM11 processor, modem digital
signal processor (DSP), modem
Advanced High-performance Bus
(AHB), interruption controller, and
sleep controller.
The ARM9 is a 400 MHz modem
processor, responsible for modulation
and demodulation of WCDMA,
Global Positioning System (GPS),
and GSM signals.
The subsystem includes Advanced
RISC Machines (ARM) A5 processor,
application DSP, and dedicated data
mover.
The A5 processor has a clock rate of
1400 MHz, supporting function
modules such as the microSD card,
EBI2, UART/USIM, I2C, GPIO, and
clock modules.
 UART = universal asynchronous
receiver/transmitter
 I2C = Inter-Integrated Circuit
 GPIO = General Purpose
Input/Output
Provides camera, pulse code
modulation (PCM), broadband codec,
vocoder, RF, HKADC, LCD,
microSD card, USB, UART, USIM
card, southbound interface (SBI),
GPIO, JTAG/ETM, and keypad
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