Battery Charger Interface - LG -A230 Service Manual

3.10 Battery Charger Interface

VUSB_LDO_4V9
VDD_IO_1V8
R205
DNI
USB_DM
USB_DP
UART_RX
UART_TX
VDD_IO_1V8
DSS
R213
P/D USB
P/U UART
10K
ABB_INT_N
The RT8966 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 I2C interface
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
RT8966 charges the battery with a trickle current until the battery voltage rises above the pre-charge
threshold. The RT8966 is capable of being powered up from AC adapter and USB (Universal Serial Bus) port
inputs. Moreover, the RT8966 includes a linear regulator (LDO 4.9V, 50mA) for supplying low power external
circuitry.
LGE Internal Use Only
FM_LNA_EN
VBAT
C205
1u
TP200
TP201
C211
3
VIN
1u
25
VBAT1
26
VBAT2
27
EXPDET
U200
11
RT9866A
DN
12
DP EAN62112401
13
U1
14
U2
15
AUD1
16
AUD2
17
MIC
32
DSS
I2C_SDA
I2C_SCL
Figure 3-10-1 BATTERY CHARGER BLOCK
VCAM_IO_1V8 VCAM_ANA_2V8 VCAM_DIG_1V8
1u 1u 1u 1u
C200 C201 C202 C203
23
VBUS1
24
VBUS2
22
D-
21
D+
20 FB202 1800
UID
19 R208 2.2K
RES
18
CAP
C223
1u
- 48 - Copyright © 011 LG Electronics. Inc. All right reserved.
3. TECHNICAL BRIEF
From External Source
(Travel Adaptor or USB)
From External Source
(Travel Adaptor or USB)
VBUS_USB
C209
1u
MUIC_IO_M
MUIC_IO_P
MUIC_ACC_ID
Only for training and service purposes