Page 1
E2C0026-27-Y3
¡ Semiconductor MSC1937-01
¡ Semiconductor
This version: Nov. 1997
Previous version: Jul. 1996
MSC1937-01
14/16-Segment ¥ 16-Digit Display Controller/Driver
GENERAL DESCRIPTION
MSC1937-01 is a Bi-CMOS alphanumeric display controller designed to interface with either
vacuum fluorescent display.
MSC1937-01 can drive displays with up to 16 digits with either 14 or 16 segments plus a decimal
point and comma.
MSC1937-01 provides the interface with the microcomputer only by two signal lines: DATA and
SCLK.
FEATURES
• Can display up to 16 digits with either 14 or 16 segments plus comma/point.
• The number of display digits is programmable within 16.
• The brightness adjustment is programmable by 1/32 step.
• The display contents can be changed at any digit.
• Built-in PLA (64 types of ASCII characters (capital letters only) can be displayed).
• Executable in 1-byte instruction format
• Drive capability
Output current : Up to –20 mA (Digit)
–10 mA (Segment) : Plastic DIP
–5 mA (Segment) : Plastic QFP
Withstand voltage : 58V
• Can also be used for LED.
• Pin compatible with 10937 manufactured by Rockwell.
• Supply voltage : 5V ± 10%
• Package options:
40-pin plastic DIP (DIP40-P-600-2.54) (Product name: MSC1937-01RS)
44-pin plastic QFP (QFP44-P-910-0.80-K) (Product name: MSC1937-01GS-K)
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¡ Semiconductor MSC1937-01
2/16
BLOCK DIAGRAM
SGA
SGB
SGC
SGD
SGE
SGF
SGG
SGH
SGI
SGJ
SGK
SGL
SGM
SGN
SGO
SGP
PNT
TAIL
AD16
AD15
AD14
AD13
AD12
AD11
AD10
AD 9
AD 8
AD 7
AD 6
AD 5
AD 4
AD 3
AD 2
AD 1
DATA
SCLK
POR
V
SS
V
DD
A
SEGMENT
DRIVERS
(ANODE)
SEGMENT
DECODER
64¥16
PLA
6¥16
DISPLAY
DATA
BUFFER
TIMING
AND
CONTROL
2¥16
DECIMAL PT.
COMMA TAIL
DIGIT DRIVERS
(GRID)
Page 3
¡ Semiconductor MSC1937-01
INPUT AND OUTPUT CONFIGURATION
• Schematic Diagrams of Logic Portion Input Circuit
V
SS
V
SS
INPUT
V
DD
• Schematic Diagrams of Logic Portion Output Circuit
V
SS
V
SS
OUTPUT
V
DD
V
DD
• Schematic Diagrams of Driver Output Circuit
V
SS
V
SS
V
DD
OUTPUT
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¡ Semiconductor MSC1937-01
PIN CONFIGURATION (TOP VIEW)
V
SS
AD 16
AD 15
AD 14
AD 13
AD 12
AD 11
AD 10
1
2
3
437
536
635
734
833
40
39
38
PNT
TAIL
SGP
SGO
SGN
SGM
SGL
SGK
V
DD
AD 9
AD 8
AD 7
AD 6
AD 5
AD 4
AD 3
AD 2
AD 1
(GND)
POR
9
10
11
12
13 28
14 27
15 26
16
17
18 23
A
19 22
20 21
40-Pin Plastic DIP
Pin Function
1 Power supply (5V)
2 Digit 16 output pin
...
17 Digit 1 output pin
18 GND
19 TEST pin
20 POWER-ON-RESET pin
21 Data input pin
22 Shift clock pin
23 Segment A output pin
...
38 Segment P output pin
39 TAIL output pin
40 POINT output pin
SGJ
32
SGI
31
SGH
30
SGG
29
SGF
SGE
SGD
SGC
25
SGB
24
SGA
SCLK
DATA
...
...
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¡ Semiconductor MSC1937-01
PIN CONFIGURATION (TOP VIEW)
(GND)
DD
AD 13
44
AD 14
43
AD 15
42
AD 16
41
SS
V
40
V
39
PNT
38
TAIL
37
SG P
36
SG O
35
SG N
34
NC
AD 12
AD 11
AD 10
AD 9
AD 8
AD 7
AD 6
AD 5
AD 4
AD 3
10
11
1
2
3
4
5
6
7
8
9
21
20
19
18
17
16
15
14
13
12
22NC
33
32
31
30
29
28
27
26
25
24
23
SG M
SG L
SG K
SG J
SG I
SG H
SG G
SG F
SG E
SG D
SG C
A
AD 2
AD 1
(GND)
DD
V
POR
(GND)
DD
V
DATA
SCLK
SG A
SG B
Pin Function
1 No connection
2 Digit 12 output pin
...
...
13 Digit 1 output pin
14 GND
15 TEST pin
16 POWER-ON-RESET pin
17 GND
18 Data input pin
19 Shift clock pin
20 Segment A output pin
21 Segment B output pin
44-Pin Plastic QFP
Pin Function
22 No connection
23 Segment C output pin
...
36 Segment P output pin
37 TAIL output pin
38 POINT output pin
39 GND
40 Power supply (5V)
41 Digit 16 output pin
...
44 Digit 13 output pin
...
...
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¡ Semiconductor MSC1937-01
PIN DESCRIPTION
Symbol Type Description
V
SS
V
DD
—
—
DATA I
SCLK I
POR I
A I/O
AD16 - AD1 O
SGA - SGP
TAIL, PNT
Power supply pin
GND pin
Input of display data/control data
Input from MSB
Shift clock of shift register
Shifts data at the falling edge of SCLK
Power-on-reset input. Input of "H" level into this pin with the power turned on
initializes this IC.
The internal state after the initialization is as follows:
1) AD1 to AD16, SGA to SGP, TAIL and PNT output are in the off state.
2) The duty cycle is set to "0".
3) The digit counter value is set to 16 digits.
4) The buffer pointer is set to AD1.
5) Pin "A" is in the output mode.
Usually used as an output mode, and outputs 1/5 of the internal oscillation
frequency. In the test mode, operates as an input pin.
Grid output pins
The output format is an emitter follower.
O
Segment output pins
The output format is an emitter follower.
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¡ Semiconductor MSC1937-01
ABSOLUTE MAXIMUM RATINGS
Parameter Symbol
Power Supply Voltage
Input Voltage
Output Voltage
V
SS
V
IN
V
GG
Digit
Output Current
I
LOAD
Segment
DIP
QFP
Storage Temperature ˚C–55 to +150T
STG
RECOMMENDED OPERATING CONDITIONS
Parameter Symbol
Power Supply Voltage
"H" Input Voltage
"L" Input Voltage
Clock Frequency
Oscillation Frequency
Frame Frequency
Operating Temperature ˚CT
V
V
f
SS
IH
V
IL
f
C
OSC
f
FR
op
Condition Unit
—
Applicable to all input pins
—
—
—
—
Rating Unit
–0.3 to +6.5
–0.3 to V
V
–58 to VSS + 0.3
SS
SS
+ 0.3
–25
–20
–10
Min.
4.5
3.6
0.0
—
—
—
–40
Typ.
—
—
—
—
500
195
—
Max.
5.5
5.5
1.0
500
—
—
85
V
V
V
mA
V
V
V
kHz
kHz
Hz
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¡ Semiconductor MSC1937-01
ELECTRICAL CHARACTERISTICS
DC Characteristics
(Ta = –40 to +85˚C, VSS = 5 V ±10%, VGG = –53 V ±0.5 V)
Parameter Symbol
"H" Input Voltage
"L" Input Voltage
"H" Input Current
"L" Input Current
V
V
V
I
I
OH1
IH
IL
IH
IL
Applicable to all input pins
Digit
"H" Output Voltage
V
OH2
"L" Output Voltage
Output Leakage Current —
V
I
OUT
I
OL
SS
Segment
"L" output current is determined by
external pull-down resistor
Condition Unit
= V
V
IH
SS
VIL = 0.0 V
V
= 5 V
SS
I
= –10mA
LOAD
V
= 5 V
DIP
QFP 2.5
= VSS – VGG = –53 V
V
OUT
SS
I
LOAD
VSS = 5 V
I
LOAD
= –10mA
= –5mA
AC Characteristics
(Ta = –40 to +85˚C, VSS = 5 V ±10%, VGG = –53 V ±0.5 V)
Min.
3.6
0.0
–2.0
–2.0
3.0
2.5
—
Max.
5.5
1.0
2.0
2.0
V
GG
10.0
10.0—Supply Current
—
—
—
+3.0
V
V
mA
mA
V
V
V
V
mA
mAno-load
Parameter Symbol
Self Oscillation Frequency
Frame Frequency
Clock Frequency
SCLK "H" Time —t
SCLK "L" Time
Data Set-up Time
Data Hold Time
Rise Time
V
SS
POR Pulse Width
POR-SCLK Time
Internal Processing Time
f
OSC
f
FR
f
CW-H
CW-L
t
DS
t
DH
t
PRZ
t
RESW
t
RESS
t
BUSY
Condition Unit
—
—
C
—
Min.
392
88
—
1.0
—t
—
—
When mounted in a unit
—
—
—
200
100
100
200
200
40
Max.
548
332
500
—
—1.0
—
—
—
—
—
—
kHz
Hz
kHz
ms
ms
ns
ns
ms
ms
ns
ms
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¡ Semiconductor MSC1937-01
1) SCLK, Data Timing
t
BUSY
–3.6 V
SCLK
t
CW-HtCW-L
t
DS
t
DH
f
C
–1.0 V
DATA
2) VSS Set and Data Word Transfer Timing
V
SS
t
PRZ
POR
–3.6 V
–1.0 V
–4.5 V
–0 V
SCLK
t
RESW
t
RESS
MSB side
Data Word
t
BUSY
Data Word
LSB side MSB side LSB side
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¡ Semiconductor MSC1937-01
(
)
(
)
FUNCTIONAL DESCRIPTION
The MSB value of 8-bit serial data determines whether the input data into MSC1937-01 is control
data or display data.
Display Data
By setting MSB = "0", the display data can be entered. The address of PLA is specified by bit 5
to bit 0 following MSB.
Table 1 provides the PLA code table.
Command Function
Display Data Sets the display contents
MSB
bit 7
bit 6 bit 5 bit 4 bit 3 bit 2 bit 1
02
X2
5
4
2
3
2
2
2
1
2
LSB
bit 0
0
X: Don't care
Control Data
The control data can be input by setting MSB to "1". In addition, a command type and associated
data with the command are determined by the bit 6 to bit 0.
Command Function
Buffer Pointer Control
Digit Counter Control
Specifies the RAM
address.
Sets the number of
display digits.
Duty Cycle Control Sets the duty value.
Test Mode Sets the test mode.
MSB
bit 7
bit 6 bit 5 bit 4 bit 3 bit 2 bit 1
12
12
12
1X002
0102
1002
112
4
4
3
3
3
2
XXX
2
2
2
2
2
2
LSB
bit 0
1
2
1
2
1
2
0
0
0
X: Don't care
a) Buffer Pointer Control
This command changes the display contents only at an arbitrary digit. (The RAM write
address is set.)
A decimal equivalent value of bits 0 - 3 should be set (desired digit number –2).
(Example) When specifying AD4, the set value is 2 (0010).
Specified Digit Set Value of
Bits 0 to 3
15 (1111)
0 (0000)
1 (0001)
2 (0010)
3 (0011)
4 (0100)
5 (0101)
6
0110
AD1
AD2
AD3
AD4
AD5
AD6
AD7
AD8
Specified Digit Set Value of
Bits 0 to 3
AD9
AD10
AD11
AD12
AD13
AD14
AD15
AD16
7 (0111)
8 (1000)
9 (1001)
10 (1010)
11 (1011)
12 (1100)
13 (1101)
14
1110
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¡ Semiconductor MSC1937-01
b) Digit Counter Control
This command sets the number of display digits.
Set the desired number of digits in bits 0 to 3.
Number of
Display Digits
1
2
3
4
5
6
7
8
Set Value of
Bits 0 to 3
1 (0001)
2 (0010)
3 (0011)
4 (0100)
5 (0101)
6 (0110)
7 (0111)
8 (1000)
Number of
Display Digits
9
10
11
12
13
14
15
16
Set Value of
Bits 0 to 3
9 (1001)
10 (1010)
11 (1011)
12 (1100)
13 (1101)
14 (1110)
15 (1111)
0 (0000)
c) Duty Cycle Control
This command sets the duty cycle of the driver output. This command allows the brightness
to be adjusted by 1/32 step. As shown in Figure 1, the blank time between digits or between
the segments is specified by 1 bit time on the hardware. Therefore, the set value ranges from
0 to 31.
1 DISPLAY CYCLE
512 bit time
AD1
AD2
AD3
AD4
AD5
AD6
AD7
AD8
AD9
AD10
AD11
AD12
AD13
AD14
AD15
AD16
SGn
31 bit time
1 bit time
31 bit time
1 bit time
V
SS
V
GG
V
SS
V
GG
Shown above is the timing when Duty Cycle = 31 (1 bit time = 5 ¥ 1/f
Fig. 1 Output Timing
OSC
)
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¡ Semiconductor MSC1937-01
d) Test Mode
This mode is not a user function, but is used for outgoing inspection.
Table 1 PLA Code Table
00
01
02
03
04
05
06
07
08
09
0A
0B
0C
0D
0E
0F
10
11
12
13
14
15
16
17
18
19
1A
1B
1C
1D
1E
1F
16-Segment Display
20
21
22
23
24
25
26
27
28
29
2A
2B
2C
2D
2E
2F
30
31
32
33
34
;
35
36
37
38
39
3A
3B
3C
3D
3E
3F
00
01
02
03
04
05
06
07
08
09
0A
0B
0C
0D
0E
0F
10
11
12
13
14
15
16
17
18
19
1A
1B
1C
1D
1E
1F
14-Segment Display
20
21
22
23
24
25
26
27
28
29
2A
2B
2C
2D
2E
2F
30
31
32
33
34
;
35
36
37
38
39
3A
3B
3C
3D
3E
3F
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Page 13
¡ Semiconductor MSC1937-01
SGA SGB
S
S
GG
G
H
S
G
G
P
S
G
O
N
S
SGF
16-SEGMENT
S
I
S
GG
M
S
S
S
SGE
J
G
G
K
G
L
S
G
C
S
G
D
PNT
TAIL
S
G
H
S
G
G
SGA
S
G
P
SGO
N
G
S
SGF
14-SEGMENT
S
G
M
S
J
G
G
S
I
S
S
S
G
C
G
K
S
G
G
L
D
PNT
TAIL
* To set the comma and decimal point, the display data at the display digit is input, then 2C and
2E data is input.
Note: Only when 2C and 2E data is entered, the write address in the RAM is not automatically
incremented. For other data, the address specified by the Buffer Pointer Control
command is automatically incremented by one each time the display data is input.
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Page 14
¡ Semiconductor MSC1937-01
APPLICATION CIRCUITS
+5 V
10 mF
V
SS
MSC1937-01
V
DD
ADn SGn POR
16 R
A
16
DATA
SCLK
DATA
CLOCK
HOST
SYSTEM
–V
GG
TYPICAL
GRID
(DIGIT)
DRIVER
R
C
E
K
CIRCUIT
R
G
TYPICAL
ANODE
(SEGMENT)
DRIVER
CIRCUIT
VACUUM
FLUORESCENT
DISPLAY
14/16
Page 15
¡ Semiconductor MSC1937-01
PACKAGE DIMENSIONS
(Unit : mm)
DIP40-P-600-2.54
Package material
Lead frame material
Pin treatment
Solder plate thickness
Package weight (g)
Epoxy resin
42 alloy
Solder plating
5 mm or more
6.10 TYP.
Notes for Mounting the Surface Mount Type Package
The SOP, QFP, TSOP, SOJ, QFJ (PLCC), SHP and BGA are surface mount type packages, which
are very susceptible to heat in reflow mounting and humidity absorbed in storage.
Therefore, before you perform reflow mounting, contact Oki’s responsible sales person for the
product name, package name, pin number, package code and desired mounting conditions
(reflow method, temperature and times).
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¡ Semiconductor MSC1937-01
(Unit : mm)
QFP44-P-910-0.80-K
Mirror finish
Package material
Lead frame material
Pin treatment
Solder plate thickness
Package weight (g)
Epoxy resin
42 alloy
Solder plating
5 mm or more
0.35 TYP.
Notes for Mounting the Surface Mount Type Package
The SOP, QFP, TSOP, SOJ, QFJ (PLCC), SHP and BGA are surface mount type packages, which
are very susceptible to heat in reflow mounting and humidity absorbed in storage.
Therefore, before you perform reflow mounting, contact Oki’s responsible sales person for the
product name, package name, pin number, package code and desired mounting conditions
(reflow method, temperature and times).
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