Miniabb (Battery Charger & Muic) Interface - LG -T370 Service Manual

3.10 MiniABB (Battery Charger & MUIC) Interface
3.10 MiniABB (Battery Charger & MUIC) Interface
VBAT
C411
USB_DM
1u
USB_DP
UART_RX
UART_TX
VDD_IO_1V8
R402
10K
I2C_SCL
I2C_SDA
MUIC_INT_N
The LP8727 is designed to provide automatic multiplexing switches between Micro/Min USB connector and USB,
UART, and Audio paths in cellular phone applications, and it also contains a single-input Li-ion battery charger
and over-voltage protected LDO. Programming is handled via ans I2C compatible Serial Interface allowing
control of charger, multiplexing switches, and reading status information of the device.
The multiplexing switches on USB and UART support High-Speed USB and Audio inputs can be driven to
negative voltage rail. The LP8727 is compatible with USB charging specification rev 1.1 form USB IF.
The Li-ion charger requires few external components and integrates the Power FET. Charging is thermally
regulated to obtain the most efficient charging rate for a given ambient temperature. It has Over-Voltage
Protection (OVP) circuit at the charger input protects the PMU from input voltage up to +28V, eliminating the
need for and external protection circuitry.
An Over-voltage protected LDO which can supply up to 50mA is designed for powering up low voltage USB g p
transceiver or waking up a PMU(Power Management Unit)when an external power source(either USB VBUS or
wall adapter) is connected to the USB connector.
LGE Internal Use Only
VDD_IO_1V8
R401
47K
C5
BATT1
D5
BATT2
R405 10 A2
DN
R406
A3
10
DP
A5
U1
A4
U2
B1
AUD1
C1
AUD2
A1
MIC
Figure 3-10-1 Mini ABB BLOCK
pp y p
E4
VBUS1
E5
VBUS2
E3
D-
E2
D+
E1
ID
U401
2.2K
D1
LP8727-B
RES
EAN62339701
R410
D3
DSS
B5
EXPDET
D2
CAP
g
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3. TECHNICAL BRIEF
3. TECHNICAL BRIEF
MUIC_IO_M
MUIC_IO_P
MUIC_ACC_ID
FB401
1800
VUSB_LDO_4V9
p g p g
Only for training and service purposes
VUSB_CHG_IN
C412
C418
1u
DNI