Battery Charger Interface / Muic - LG -A290 Service Manual

3.11 Battery Charger Interface / MUIC

MINI_ABB For AGR Without Audio
VUSB_LDO_4V9
VIO
R226
47K
R247
USB_DM
R248
USB_DP
UART_RX
UART_TX
HOOK_DET
VIO
I2C_SDA1
I2C_SCL1
MUIC_INT
The McKinney is designed to interface the cell phone USB, and audio chips with external peripherals via a micro-USB
connector. The switch features impedance detection for identification of various accessories that are attached through
DP and DM of the micro-USB port. When an accessory is plugged into the micro-USB port, the switch uses a detection
mechanism to identify the accessory (see the State Machine for details). It will then switch to the appropriate channel—
data, audio, or USB.
The McKinney has an IC interface for communication with the cell phone baseband or applicationsprocessor. An
interrupt is generated when anything plugged into the micro-USB is detected. Another interrupt is generated when the
device is unplugged.
The McKinney also provides a linear charger up to 1.1A charging current, 4 channel LED current drive(max 150mA) and 4
linear regulators.
If VBUS is higher than 4.0V and lower than 7.5V (programmable 6.0V ~ 7.5V through IC) and 50mV higher than VBAT
then charger starts charging automatically. If VBAT is below .5V, McKinney starts pre-charge mode with 80mA charging
current until VBAT reaches .5V and switch to fast charge mode with soft start. When battery voltage approaches
programmed regulation voltage(4.V default), CV charging mode starts with programmed regulation voltage. At CV
mode, if charging current reaches programmed full charge current, the device generates interrupt to notice charging full
condition and start charge off timer. If charger off timer is disabled, charger stays at CV mode until stopped by system
control.
LGE Internal Use Only
No CCDS
VBAT
C244 C245
1u
1u
3
VIN
25
VBAT1
26
VBAT2
27
EXPDET
11
0
USB1DM
12
0
USB1DP
13
USB2DM
14
USB2DP
15
AUDL
16
AUDR
R250 17
MIC
32
470
DSS
VUSB_LDO_4V9
R232
47K
DSS : High--> Default UART
Figure 3.11.1 BATTERY CHARGER BLOCK
VHP_MIC_2V0
VCAMD TORCH_3V3 VIB_3V3
C240 C241 C242
1u 1u 1u
23
VBUS1
24
VBUS2
22
D-
21
U203
D+
20 FB209
ID
19
R2_2K
18
CLDO
C252
10n
- 46 - Copyright © 01 LG Electronics. Inc. All right reserved.
3. TECHNICAL BRIEF
C243
1u
From External Source
VUSB_CHG_IN
(Wall Adaptor or Computer)
C250
1u
MUIC_IO_M
MUIC_IO_P
120
MUIC_ACC_ID
R227
2.2K
Only for training and service purposes