Speaker & Midi Ic - LG G5300 Service Manual

3. TECHNICAL BRIEF
3.19 Speaker & MIDI IC
The phones of this model don't use buzzer, but uses the loud speaker and Melody IC which makes
the robust joyful melody sounds.
Melody IC control
5 GPIO is assigned to control melody IC. Melody data is transferred to melody IC and played by
loud phone.
External 3.3V LDO
The maximum output current of analog amplifier in melody IC is 300mA. The current can not be
fed by internal Omega so external LDO(U303) is included for max power of loud Speaker.
R244
16POLY 10K
40POLY NC
R214
VBAT
C220
2.2u
(2012)
4.7uF_2012
R201
13MHz
_MIDI_RST
2V8_VMEM
ADD0
_RD
_MIDI_CS
R244 10K
_WR
_MIDI_IRQ
R212
DATA8
10K
DATA9
DATA10
0
DATA11
DATA12
DATA13
DATA14
DATA15
C212
2V8_VMEM R210 3.3K
1000p
C214 0.1u
R212
0
10K
R215
C218 0
0.1u
3V3_VMIDI
U202 LP3981ILD-3.3
1 6
VOUT VEN
2 5
VIN BYPASS
3 4
VOUT_SE GND1
GND2
C222
Figure 3-35. Speaker & MIDIIC.
0
1
11
CLK1 HPOUT_R
4
10
_RST
R203
30 HPOUT_L
A0
33K
31 12
EQ1
_RD
29
_CS
5
13
EQ2
NC
28
_WR
3
_IRQ
27 14
EQ3
D0
26
2
D1 LED
25
19
D2 MTR
24
D3
U207
23
D4
YMU762
22
17
D5
SPOUT1
21
D6
20
D7
PLLC SPOUT2
6
18
3V3_VMIDI
VREF
9
SPVDD 15
32 IOVDD
VDD
7
C217
0.1u
16
VSS SPVSS
8
VMIDI_CTL
C221
0.1u
- 48 -
C201
0.01u
R205
82K
C205
390p
R207 0
R209 0
C215 C216
47p 47p
CN201
1
SPK+
2
SPK-
Speaker