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LGE Internal Use Only
Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
3. Technical Brief
Figure 24. MUIC Typical Application Circuit
USB 2.0
Hi-Speed
UART
VBUS
DN1
DP2
MIC
BAT
Left
Right
Control
U1
U2
Audio
CODEC
SCL
SDA
INT
D+
D-
ID
UID
GND
COMN1
COMP2
3.3K
CAP
1uF
2.2uF
X5R or
X7R
MicroController
I2C_Clock
I2C_Data
Interrupt
UID LDO
ADC
IOVcc
VCCINT
VCCINT
1uF
>30V
100K
800K
100K
RES
200
K
D+
D-
TX
RX
AUD1
AUD2
Li-ION
Battery
Charger
62
0
USB
Charger
Detection
VB
Battery
3.7V LDO
Ideal Diodes
3.5V
ISET
22pF
GND
Mi
cr
o USB
Co
nne
cto
r
22pF
>30V
22pF
22pF
22pF
Mic
MAX9877
IC
Latch
D
Q
0.4V
0.4V
Adjust this resistor value for the
bias current required by the
headset microphone – ideal value
should give Vmic_dc of 1.1V with
an average headset (300uA dc bias
current)
300
K
Connect to ground or leave
unconnected to set default startup
to USB. Connect to VBAT with a
300K resistor for UART startup
100K
1.
8V
VCCINT
Содержание AR140B
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