JVC RC-BM5, Service Manual

Page: 31 / 52

RC-BM5
1-31
PT6553 (IC401) : LCD driver with key input function
1. Terminal layout 2. Block diagram
1 to 4
5 to 40
41,42,43
44
45
46 to 49
50 to 54
55
56
57
58
59
60
61
62
63
64
SG1/P1 to SG4/P4
SG5 to SG40
COM1,COM2,COM3
KO1/SG41
KO2/SG42
KO3 to KO6
K11 to K15
Test
VDD
VDD1
VDD2
VSS
OSC
DO
CE
CLK
DI
O
O
O
O
O
O
I
I
-
-
-
-
I/O
O
I
I
I
Segment output general purpose output pins under serial data control
these pins may be used a general purpose output parts.
Segment output pins
Common driver output pins
Key scan output segment output pin
Key scan output segment output pin
Key scan output pins
Key scan input pins
Test pin
Power supply
Power supply
Power supply
Ground
Oscillator pin
Data output pin
Chip enable pin
Synchronization clock input pin
Din transistor input pin
3. Pin function
Pin No. Symbol I/O Function
KO6
K11
K12
K13
K14
K15
TEST
VDD
VDD1
VDD2
VSS
OSC
DO
CE
CLK
DI
KEY SCAN
OSC
DO
DI
CLK
CE
VDD
VDD1
VDD2
VSS
TEST
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
SG32
SG31
SG30
SG29
SG28
SG27
SG26
SG25
SG24
SG23
SG22
SG21
SG20
SG19
SG18
SG17
P1/SG1 P2/SG2 P3/SG3 P4/SG4
SG5 SG6 SG7 SG8 SG9
SG10 SG11 SG12 SG13 SG14 SG15 SG16
1 2 3 4 5 6 7 8 9
10 11 12 13 14 15 16
KO5 KO4 KO3 KO2/SG42 KO1/SG41 COM3 COM2 COM1 SG40 SG39 SG38 SG37 SG36 SG35 SG34 SG33
48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33
COM1 COM2 COM3 SG40 SG5 SG4/P4 SG3/P3 SG2/P2 SG1/P1
K15 K11 K05 K03
SG42/KO2 SG41/KO1
KEY BUFFER
CONTROL
REGISTER
SHIFT REGISTER
SEGMENT DRIVER & LATCH
COMMON
DRIVER
CLOCK
GENERATOR
INTERFACE
VDET