U9200 Maintenance Manual
INTERNAL
(2012-06-13)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
Page 45 of 80
Subsystem Module
Unit
Function
Power management
of circuits
(power-on and
power-off analysis)
LDO provides flexible methods for
power management.According to
the service status, protocol or the
requirement of power saving, the
board software manages the power
of circuits to reduce power
consumption and provides
three-line 32 kHz clock.
TWL6030
enhanced
function
RTC
32.768 kHz sleep clock is used for
embedded RTC circuit to provide
accurate time.
HKADC
17-line 10 bit analog signal input
supported.
Double I2C
interfaces
I2C controller and SMART
REFLEX I2C.
UVLO
Low voltage power-off function. If
the input voltage is lower than a
threshold for a specified period, the
phone is powered off.
WDT reset
Supports overflow reset of WDT
counter
Over-temperature
protection
If the junction temperature is over
150°C, the phone is powered off
automatically.
Internal drive circuit
There are four LED drivers, one
vibrator driver and one speaker
driver.
Interrupt
management
There is an embedded interrupt
manager to process the related
interrupt signals.
USB driver
There is an embedded OTG USB
driver supporting USB 2.0 HS. The
interface is of /B type. The software
does not support OTG function
now.
For details on the conceptual diagram and component layout for maintenance, see the
following compressed files.
HD1U9200MG.rar
bottom.rar top.rar
