Huawei YU220, Service Manual

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YU220 service manualV1.0
2013-10-18
Huawei secrets, no dispersion without permission
SIM card，LCD backlight and so on；
MT6166 is radio-frequency signal transceiver chip. Complete up and down RF
signal transformation.
According to logical function, veneer can be divided into base band、RF、power
and user interface including four subsystem. Each subsystem including module and
cell and realized function as show in picture.
subsystem Module Unit Function
Baseband
subsyste
m
MT6572
Modem subsystem
ARM Cortex-R4 service as MODEM treater
，
1.2GHZ, complete WCDMA
，
GPS
，
GSM
modulation-demodulation function, subsystem
includes ARM treater
，
modem DSP
，
modem
AHB trunk, interrupt controller, and dormant
controller and so on.
Application
subsystem
NEON media processing engine, support SD card ,
UART / USIM, I2C, GPIO, clock and
other functional modules , subsystems, including
ARM processors
, application DSP,
dedicated data
mover and so on.
User interface
processing unit
Camera connector
、
broadband CODEC
、
Vocoder
、
RF connector
、
LCD connector
、
SD
connector
、
USB connector
、
UART connector
、
USIM card connector
、
GPIO
、
keypad connector
and so on.
Multi-media and
game engine
Multimedia and game engine running Mpeg /
jpeg hardware engine
, MP3/MMS/MIDI
function
;
power
management
（
MT6323
）
Power voltage
supervisory
External power input, battery
,
VDD,
so important for the LDO
Temperature
monitoring
Battery temperature
、
PA temperature
NAND
NAND features
consumption
、
file
system support.
Stored program and some NV,4Gb
DDR1 RAM
（
POP
）
Storage RAM space run
, 2Gb (64M × 32)
RF
subsystem
WCDMA and
GSM/DCS
launch receiver
AFC circuit, APC
circuit
，
AGC
circuit
，
each
device
Complete WCDMA receive and transmit RF
section functions. Mainly contains
additional MT6166 RF chip and peripheral circuits.
GPS GPS receive
GPS signal receiving and processing, including its
peripheral additional circuitryMT6627
BT connector BT module
Bluetooth and
WLAN complete baseband functionality and