Lge Internal Use Only - LG -E510 Service Manual

3.10.3. Charging control
The RT8965 integrates a single-cell Li-ion battery charger IC with pre-charge mode, a fast charge mode
(constant current mode) or constant voltage mode. The charge current is programmable via the I
as shown in the control register address tables, CHG_Ctrl1 and CHG_Ctrl2. The CV mode voltage is fixed at
4.2V. The pre-charge threshold is fixed at 2.6V. If the battery voltage is below the pre-charge threshold, the
RT8965 charges the battery with a trickle current until the battery voltage rises above the pre-charge
threshold. The RT8965 is capable of being powered up from AC adapter and USB (Universal Serial Bus) port
inputs. Moreover, the RT8965 includes a linear regulator (LDO 4.9V, 50mA) for supplying low power external
circuitry.
3.10.3.1. Pre-Charge Mode
Figure 1 shows the RT8965 charging state of the charging function. During a charge cycle, if the battery
voltage is below the V
PRECH
revives deeply discharged cells and protects battery life. The precharge current has a typical value of 50mA.
Constant
Pre-charge
Current
Mode
Mode
Battery
Charge
Current
Programmed
Charge
Current
Precharge
Threshold
Figure. RT8965 Charging State of the Charger Function

LGE Internal Use Only

threshold (typical value is 2.6V), the charger enters pre-charge mode. This feature
Constant
Recharge
Voltage
Phase
Mode
4.V
Battery
Regulation
Voltage
threshold
Battery
Full
CHG pull
High
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3. TECHNICAL BRIEF
C interface
2
Only for training and service purposes