Huawei Ascend G510, Руководство по обслуживанию

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G510 Maintenance Manual V1.0 INTERNAL
2013-01-28
Huawei Confidential Page 41 of 96
Analysis
The G510 adopts the charging solution embedded in the PM8029. Three charging modes are
available, including trickle charging, constant current charging, and constant voltage charging.
The charging circuit is VEXT_DC > VCHG > VPH_PWR > Q201 pin 3 > VBAT.
Table 9-1 lists the definitions of related voltages and currents.
Table 9-1 Definitions of related voltages and currents
Item Definition
V
(SHORT)
Initial voltage of constant current charging after trickle charging ends.
V
(OREG)
Initial voltage of constant voltage charging after constant current charging
ends.
IO
(CHARGE)
Current of constant current charging.
I
(IN_LIMIT)
Current limit of constant current charging. You must select either I
(IN_LIMIT)
or
IO
(CHARGE)
.
I
(SHORT)
Current of trickle charging.
V
(RCH)
Battery voltage when the charging is complete.
The PM8029 monitors the main voltage of the G510 using the CSOUT pin as follows:

Trickle charging starts when the battery voltage is smaller than V
(SHORT)
.

Constant current charging starts when the battery voltage is larger than V
(SHORT)
and
smaller than V
(OREG)
.

Constant voltage charging starts when the battery voltage is equal to V
(OREG)
.

Charging stops when the charging current is smaller than the threshold but the battery
voltage exceeds a certain range (V
(RCH)
).
The PM8029 is embedded with a 15-minute and a 32-second timer to save CPU resources.
The 15-minute timer starts automatically to charge the battery using loaded parameters if the
CPU does not provide I2C control signals. If the CPU provides I2C control signals, the
32-second timer starts. Figure 9-8 shows the timer start process
.