E2C0029-27-Y4
¡ Semiconductor
MSC7128-xx
¡ Semiconductor
5
¥
7-Dot Character
¥
16-Digit Display Controller/Driver
This version:
MSC7128-xx
Nov. 1997
Previous version: Jul. 1996
GENERAL DESCRIPTION
The MSC7128-xx is a general purpose display controller for vacuum fluorescent display tube.
The MSC7128-xx drives displays with up to 35 anodes (dots) and up to 16 grids (characters) plus
a cursor.
The controller accepts command and display data input words on a clocked serial input line.
Commands control the on/off duty cycle, starting character position, number of characters to
display and display modes (PLA mode and Lamp Test mode). An internal PLA-type character
generator provides character decoding and dot pattern generation for the full 128 characters.
A 35
¥
128-bit PLA (ROM) code is programmable.
FEATURES
• Logic supply voltage (V
DD
)
:+5V
• VF driver supply voltage (V
EE
)
:–55V
• Driver output current
– VF grid driver
:–30mA
– VF anode driver
:–2mA
– VF cursor driver
:–10mA
• Direct drive capability for vacuum fluorescent display (no pull-down resistor is required)
• Built-in oscillation circuit
• Built-in power-on-reset circuit with external C
• Serial host interface (data in, clock, chip select)
• Serial data input for 8-bit control and display data words
• Command functions
– On/off duty cycle
: 0/16 to 15/16
– Character display position
: 0 to 15
– Number of display digits
:1 to 16
– Display modes
: PLA mode, and Lamp Test mode
• Built-in 35 x 128-bit PLA-type character generator
– Character font
:5
¥
7
– Number of characters
:128
– Programmable PLA code
• Package options:
64-pin plastic SDIP (SDIP64-P-750-1.78) (Product name : MSM7128-xxSS)
64-pin plastic QFP (QFP64-P-1420-1.00-BK) (Product name : MSM7128-xxGS-BK)
xx indicates the code number.
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V
DD
DA
8
8
8BITS
¥
b0-7
16 WORDS
LR
COMMAND
DECODER
RAM
DISPLAY
DATA
BUFFER
SEG1
SEG2
36
SEG34
SEG35
SEG36
8
7
CHARACTER
GENERATOR
35
35
¥
128 BITS
LATCH
PLA
LATCH
SEG
DRIVER
8-BIT
SHIFT REGISTER
BLOCK DIAGRAM
¡ Semiconductor
CS
CS
CP
5
DECODER
W/R
LATCH
4
READ
ADDRESS
COUNTER
RESET
fDIG
RESET
CP
fW
RAMPC
fR
4
RESET
COM
DRIVER
COM1
COM2
ADDRESS
SELECTOR
4
4
b0-3
W.A.C. LOAD
W.A.C. COUNT
W.A.C. COUNT
4
b0-3
4
b0-3
A=B
4
D.G
LOAD
DUTYCYCLE REGISTER
WRITE
ADDRESS
COUNTER
ROM ROM
PC1 PC2
LT
RESET
fSEG
LR S
OE
3
b4-6
R L
RESET
CONTROL
CP
RESET
4
4
16
OSCI
OSCO
OSC
TIMING
GENERATOR
RESET
RESET
CS
TEST
STEP
OE
COM14
COM15
COM16
TEST
COUNT
R
4
RESET
b0-3
RESET
BLANK
DUTY AND BLANK
DUTY AND
BLANK
GENERATOR
RESET
DUTYCYCLE
COUNTER
DIGIT
COUNT
REGISTER
A
B
ADDRESS
COMP
D.G
LOAD
V
SS
V
EE
MSC7128-xx
2/27
¡ Semiconductor
MSC7128-xx
INPUT AND OUTPUT CONFIGURATION
• INPUT PIN
V
DD
DA
CS
CP
OSCI
V
DD
R
RESET
TEST COUNT
TEST STEP
GND
V
DD
• OUTPUT PIN
V
DD
OSCO
V
DD
SEG1 - 35
V
DD
V
EE
SEG36
COM1-16
V
EE
3/27
¡ Semiconductor
MSC7128-xx
PIN CONFIGURATION (TOP VIEW)
OSC0
OSCI
TEST COUNT
TEST STEP
V
SS
V
EE
COM 1
COM 2
COM 3
COM 4
COM 5
COM 6
COM 7
COM 8
COM 9
COM10
COM11
COM12
COM13
COM14
COM15
COM16
SEG 36
SEG 35
SEG 34
SEG 33
SEG 32
SEG 31
SEG 30
SEG 29
SEG 28
SEG 27
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
64
63
62
61
60
59
58
57
56
55
54
53
52
51
50
49
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
CS
DA
CP
RESET
V
DD
1
V
DD
2
SEG 1
SEG 2
SEG 3
SEG 4
SEG 5
SEG 6
SEG 7
SEG 8
SEG 9
SEG 10
SEG 11
SEG 12
SEG 13
SEG 14
SEG 15
SEG 16
SEG 17
SEG 18
SEG 19
SEG 20
SEG 21
SEG 22
SEG 23
SEG 24
SEG 25
SEG 26
64-Pin Plastic Shrink DIP
4/27
¡ Semiconductor
PIN CONFIGURATION (TOP VIEW)
SEG 32 20
SEG 31 21
SEG 30 22
SEG 29 23
SEG 28 24
SEG 27 25
SEG 26 26
SEG 25 27
SEG 24 28
SEG 23 29
SEG 22 30
SEG 21 31
64-Pin Plastic QFP
SEG 20 32
,
TEST COUNT
TEST STEP
COM 1
V
EE
OSC O
OSC I
V
SS
64
63
62
61
60
59
58
57
56
55
DA
CP
CS
COM 2
COM 3
COM 4
COM 5
COM 6
COM 7
COM 8
COM 9
COM 10
COM 11
COM 12
COM 13
COM 14
COM 15
COM 16
SEG 36
SEG 35
SEG 34
SEG 33
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
MSC7128-xx
RESET
54
V
DD1
53
52
51
50
49
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
V
DD2
SEG 1
SEG 2
SEG 3
SEG 4
SEG 5
SEG 6
SEG 7
SEG 8
SEG 9
SEG 10
SEG 11
SEG 12
SEG 13
SEG 14
SEG 15
SEG 16
SEG 17
SEG 18
SEG 19
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