Table of Contents
Advertisement
3. TECHNICAL BRIEF
(2) MIDI IC (YMU759B, U200)
The phone uses melody IC which makes the robust joyful melody sounds.
6 signals (MIDI_RST, ADD0, RD, MIDI_CS, WR, MIDI_INT) from AD6525 are used to
control the melody IC.
Melody data (DATA[8:15]) is transferred to melody IC and played by the dual mode speaker.
External 3.3V LDO (U202) is used for the MIDI chip because the maximum output current
of analog amplifier in melody IC is 300mA.
2V8_VMEM
2V8_VMEM
Figure 3-19 Circuit Diagram of MIDI-IC and external LDO
Y
R
2
3
0
1
1
3
M
H
Z
4
M
D I
_ I
R
S
T
0
3
0
A
D
D
0
3
1
R
D
2
9
M
D I
_ I
C
S
R
2
3
2
5
1
0
K
2
8
W
R
3
M
D I
_ I
N I
T
2
7
D
A
T
A
8
2
6
D
A
T
A
9
2
5
D
A
T
A
1
0
2
4
D
A
T
A
1
1
2
3
D
A
T
A
1
2
2
2
D
A
T
A
1
3
2
1
D
A
T
A
1
4
2
0
D
A
T
A
1
5
R
2
3
5
6
0
1 .
u
3
3 .
K
C
2
3
4
9
R
2
3
8
3
2
1
0
K
R
2
3
9
7
C
2
3
8
0
0
1 .
u
8
3V3_VMIDI
VBAT
C
2
3
9
2
2 .
u
2 (
0
1
) 2
4
7 .
u
C
2
4
1
- 32 -
U
2
0
0
M
U
7
5
9
B
1
1
C
L
K
1
H
P
O
U
T
_
R
1
0
_
R
S
T
H
P
O
U
T
_
L
A
0
1
2
E
Q
1
_
R
D
_
C
S
1
3
E
Q
2
F I
S
E
L
_
W
R
_
R I
Q
1
4
E
Q
3
D
0
2
D
1
E
X
T
1
1
9
D
2
E
X
T
2
D
3
D
4
1
7
D
5
S
P
O
U
T
1
D
6
D
7
P
L
L
C
S
P
O
U
T
2
1
8
3V3_VMIDI
V
R
E
F
S
P
V
D
D
1
5
S
D
O
U
T
V
D
D
1
6
V
S
S
S
P
V
S
S
U
2
0
2
L
P
3
9
8
1
L I
D
3 -
3 .
1
6
V
O
U
T
V
E
N
2
5
V
N I
B
Y
P
A
S
S
3
4
V
O
U
T
_
S
E
G
N
D
1
G
N
D
2
R
2
3
1
3
3
K
C
2
3
2
3
9
0
p
C
2
3
5
C
2
3
6
C
2
3
7
0
1 .
u
4
7
p
4
7
p
V
M
D I
_ I
C
T
L
C
2
4
0
0
1 .
u
Advertisement
Table of Contents
