Huawei U8860 Maintenance Manual page 37

U8860
Maintenance Manual
Subsystem Module
MIC
Earphone
Vibrator interface
NFC
Gyroscopes
Compass
Accelerometer
Power Internal backup
Supply battery
Subsystem
External power
supply (travel
charger)
Power distribution
network and
power
management
function
Issue 1.0 (2011-11-14)
Unit
Interface circuit,
connection mode,
MIC component
Earphone,
headphone interface
circuit, MIC
interface circuit
Driver mode,
connection mode,
vibrator
I2C interface
control
I2C interface
control
I2C interface
control
I2C interface
control
Li-ion battery,
interface
component
Adaptor and
interface
component
Power distribution
network
Backup battery
management,
charge circuit,
charge mode, and
charge protection
Board circuit power
management
(power-on/off
analysis)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd
9 Principles and Troubleshooting
Function
The phone has a dual built-in MIC to eliminate the
environment noise.
The phone provides a headphone jack to output
audio or mp3. The MIC on the headphone cable
inputs audio.
When there is an incoming call, the vibrator
vibrates.
Performs approach sensing function
Realizes the sensing of three directions to perform
the game function.
Senses the magnetic field to help indicate the
direction.
Acceleration sensing helps perform the game
function
Li-ion battery with standard output of 3.7 V/1950
mAh. It is required that the charge/discharge
lifecycle is over 500 times. The battery should pass
the following authentication: GB18287 safety
requirements (Li-ion battery)
The charger meets the requirements of China,
Europe, the USA, and Australia: 90–240 V, 45–55
Hz, AC input. The model differs with different
markets. The output voltage of the charger is 5 ±
0.25 V. The charger must pass CE and CCC
authentication. The output current of the charger
should be able to charge the battery and support the
normal operation of the phone at the same time.
The charging current requirement is 1 A.
It includes filter networks and cabling of the power
supply.
It manages battery charging and discharging,
overcharging and over-discharging protection. The
battery that maintains RTC current can also be
charged.
It mainly indicates LDO, which manages power
supply flexibly. Based on protocols and power-save
analysis requirements, the board software manages
the power supply of unit circuits according to
service status to decrease power consumption of
devices. A 32.768 KHz sleep clock is provided.
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