Dear customers,
About the change in the name such as "Oki Electric Industry Co. Ltd." and
"OKI" in documents to OKI Semiconductor Co., Ltd.
The semiconductor business of Oki Electric Industry Co., Ltd. was succeeded to OKI
Semiconductor Co., Ltd. on October 1, 2008.
Therefore, please accept that although
the terms and marks of "Oki Electric Industry Co., Ltd.", “Oki Electric”, and "OKI"
remain in the documents, they all have been changed to "OKI Semiconductor Co., Ltd.".
It is a change of the company name, the company trademark, and the logo, etc. , and
NOT a content change in documents.
October 1, 2008
OKI Semiconductor Co., Ltd.
550-1 Higashiasakawa-cho, Hachioji-shi, Tokyo 193-8550, Japan
http://www.okisemi.com/en/
E2C0019-27-Y5
¡ Semiconductor
MSC1208
¡ Semiconductor
This version: Nov. 1997
MSC1208
Previous version: Jul. 1996
23-bit
¥
2 Duplex Controller/Driver with Digital Dimming and Keyscan Function
GENERAL DESCRIPTION
The MSC1208 is a Bi-CMOS display driver for 1/2-duty vacuum fluorescent display tube.
It consists of 58-bit shift registers, latch circuits, a 10-bit digital dimming circuit, 4
¥
4 switch
matrix, and a keyscan circuit for 2-channel, 3-contact rotary switch. With these features, the
MSC1208 not only can display frequencies for audio systems used in automobile applications
and various information, but also can accept keyboard entry. Thus the front panel functions can
be carried out only by this IC.
Since the MSC1208 has the data parity check function and the self-check functions, inspection
at shipment and failure detection can easily be performed.
In addition, since the MSC1208 uses serial interfacing, only two signal lines, DATA ENABLE
and DATA I/O, are used for connection with a microcontroller.
FEATURES
• Power supply voltage
: V
DD
=8 to 18V (Built-in 5V-regulator for logic)
• Operating temperature range
: –40 to 85°C
• Directly drives 23 segments
: I
OH
=–8.8mA, Max. at V
OH
=V
DD
–0.8V
• Built-in 4
¥
4 switch matrix and key scan circuit for 2ch, 3-contact switching
• Built-in digital dimming circuit with 10-bit resolution
• Data parity check function
• Self-check function (segment ON/OFF at intervals of about 1 second in test mode)
• Built-in RC oscillator (capacitor is connected externally)
• Built-in power-on reset circuit
• Package:
42-pin plastic shrink DIP (SDIP42-P-600-1.78) : (Product name : MSC1208SS)
¥¥¥
indicates the code number.
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¡ Semiconductor
MSC1208
BLOCK DIAGRAM
SEG1
SEG23
V
DD
POR
GND
Regulator
5V
PWMOUT
DATA ENABLE
2
DATAI/O
Parity
Checker
Parity
Generator
L
bit56 to 1
56
56
Segment Driver
46Æ23 Segment Control
bit 46 to 24
(Grid2)
46 bit Latch
bit1
bit 23 to 1
(Grid1)
bit47 bit46
D
bit58, 57 bit56
Parity Dimming data
Display data
58 bit Shift Register
C R
bit56 to 47
OSC
OSC
Timing Generator
Grid
Pre-driver
GRID1
GRID2
10-bit Presetable
Down Counter
SI
C
PWM
to PWM OUT
58-bit Shift Register (26-bit presetable+32-bit¥"1")
out
PE
S
4
S
4
S
4
S
4
S
8
S
2
Parity
Generator
Rotary
Direction
Checker &
Up/down
Counter
Vreg
L
4-bit
TEST
4
Latch
L
4-bit
4
Latch
4-bit
4-bit
L
Latch
L
Latch
L
3-bit
3
4
4
Col4 to 7
Latch
L
3-bit
Latch
3
Col1 to 3
Timing
Generator
Row 4 3 2 1
Detector w/debounce
Col 7 6 5 4 3 2 1
With100kW pull-up resistor
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¡ Semiconductor
MSC1208
PIN CONFIGURATION (TOP VIEW)
SEG18 1
SEG19 2
SEG20 3
SEG21 4
SEG22 5
SEG23 6
ROW1 7
ROW2 8
ROW3 9
ROW4 10
COL1 11
COL2 12
COL3 13
COL4 14
COL5 15
COL6 16
COL7 17
DATA ENABLE 18
DATAI/O 19
GND 20
OSC 21
42 V
DD
41 SEG17
40 SEG16
39 SEG15
38 SEG14
37 SEG13
36 SEG12
35 SEG11
34 SEG10
33 SEG9
32 SEG8
31 SEG7
30 SEG6
29 SEG5
28 SEG4
27 SEG3
26 SEG2
25 SEG1
24
GRID2
23
GRID1
22
TEST
42-Pin Plastic Shrink DIP
3/14
¡ Semiconductor
MSC1208
PIN DESCRIPTIONS
Pin
42
20
19
Symbol Type
V
DD
GND
DATA
—
—
I/O
Description
Power Sypply Voltage. A 12V power supply is connected.
Ground. 0V is applied.
Serial data input-output.
Enters the input mode when a "H" level signal is input to DATA ENABLE; enters the
output mode when a "L" level signal is input to DATA ENABLE.
Serial clock input.
During the "H" level of clock pulse, the input data of the DATA I/O pin (display data or
dimming data) is read, and during the "L" level of clock pulse, the output data (key
swich data) is output to the DATA I/O pin.
Input for the key matrix.
These pins are "L" active. When these keys are in the inactive state, these pins are at
"H" level through the internal pull-up resistors. COL1 to COL3 are for the rotary switch
and COL4 to COL7 are for the push-button switch.
Signal outputs for scanning key matrix.
Normally, ROW1 to ROW4 output a "I" level. Key scanning is executed only once when
a transfer of the rotary switch contact or pressing down or release of the push-button
switch is detected. Key scanning is continued if the rotary switch contact is in the open
state after this one-time scanning. Then, scanning stops when the rotary switch contact
makes connection with any of the selective contacts. After key scanning is stopped,
ROW1 to ROW4 return to a "L" level.
RC oscillator connection. A capacitor is connected between GND and this pin.
Segment signal output.
Inverted GRID signal output. This signal is connected to an external grid driver
(e.g., PNP transistor) input.
Input for test. Since this pin has as internal a pull-up resistor, leave this pin open or
pull it up for use. When a "L" level signal is input, all segment outputs go on and off
at intervals of 1 second.
18
DATA
ENABLE
I
11 to 17
COL1 to 7
I
7 to 10
ROW1 to 4
O
21
OSC
25 to 41, SEG1 to 23
1 to 6
23 , 24
GRID1,2
22
TEST
I/O
O
O
I
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