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LGE Internal Use Only
Copyright © 011 LG Electronics. Inc. All right reserved.
Only for training and service purposes
3. TECHNICAL BRIEF
3.10 Battery Charger Interface
Figure 3-10-1 BATTERY CHARGER BLOCK
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.
From External Source
(Travel Adaptor or USB)
FM_LNA_EN
TP200
VCAM_IO_1V8 VCAM_ANA_2V8
VUSB_LDO_4V9
C211
1u
U200
EAN62112401
RT9866A
33
82
27
26
13
25
11
01
24
23
13
22
92
21
20
14
12
7
2
9
5
32
19
18
17
8
03
6
16
4
3
15
1
1T
U
O
AUD1
VIN
3T
U
O
AUD2
1
D
N
G
L
C
S
2
D
EL
MIC
CAP
RES
DSS
4T
U
O
3
D
EL
2T
U
O
1
D
EL
DP
U2
UID
D+
A
D
S
D-
\T
NI
VBUS1
VBUS2
4
D
EL
DN
VBAT1
U1
VBAT2
EXPDET
2
D
N
G
D
N
G
P
1800
FB202
VCAM_DIG_1V8
C209
1u
TP201
1u
C203
C202
1u
1u
C201
C200
1u
C205
1u
VDD_IO_1V8
2.2K
R208
VBUS_USB
VDD_IO_1V8
VBAT
R213
10K
R205
DNI
1u
C223
UART_RX
UART_TX
USB_DM
USB_DP
I2C_SDA
I2C_SCL
MUIC_ACC_ID
MUIC_IO_P
MUIC_IO_M
2
A
C
_
D
E
L
_
D
C
L
1
A
C_
D
EL
_
D
CL
ABB_INT_N
DSS
P/U
P/D
USB
UART
From External Source
(Travel Adaptor or USB)