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U8185
Maintenance Manual
Analysis
The U8185 uses the PM8029 solution for its charging management. The following figure
shows the internal structure of the PM8029. The PM8029 has three charging states: trickle
charging, constant current charging, and constant voltage charging. A universal charging
channel is used: VEXT_DC→VCHG→Q201, pin3→VBAT
External PMOS is controlled through BA T_FET_N to implement the charging functions
including trickle charging, constant current charging, constant voltage charging, and pulsed
charging. The following figure shows a common charging curve.
Issue 1.0 (2012-03-23)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
9 Principles and Failure Analysis
25
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