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MSC1230
¡ Semiconductor
¡ Semiconductor
MSC1230
111-Bit 2/3-Duty Controller/Driver with Digital Dimming Function
GENERAL DESCRIPTION
The MSC1230 is a Bi-CMOS display driver with digital dimming function. It enables switching
between 1/3-duty vacuum fluorescent (VF) display tube and universal VF display tube by pin
control.
The MSC1230 consists of a 112-bit shift register, a 111-bit latch, a 10-bit digital dimming circuit,
37 segment drivers, and 3 grid drivers.
The MSC1230 provides an interface with a microcomputer only by three signal lines: CS,
DATA-IN, and CLOCK.
By using the chip select function, the DATA-IN and CLOCK signal lines can be shared
by other peripheral circuits.
FEATURES
· Power supply voltage
: V
DD
=8 V to 18 V (built-in 5 V regulator for logic circuit)
· Operating temperature range
: Ta=40
°
C to +85
°
C
· 37-segment driver outputs
: I
OH
=6 mA at V
OH
= V
DD
0.8 V
· 3-grid driver outputs
: I
OH
=30 mA at V
OH
= V
DD
0.8 V
· Built-in digital dimming circuit (10-bit resolution)
· Switchable between 1/3-duty VF display tube and universal VF display tube*
When SEL pin is left open
: Selects universal VF display tube (The grids GRID1, GRID2,
and GRID1+GRID2 are turned on repeatedly in this order)
When SEL pin is used at 0 V : Selects 1/3-duty VF display tube (The grids GRID1, GRID2,
and GRID3 are turned on repeatedly in this order)
· Built-in oscillation circuit (external R and C)
· Built-in Power-On-Reset circuit
· Package:
56-pin plastic QFP (QFP56-P-910-0.65-2K)(Product name: MSC1230GS-2K)
*
A universal VF display tube is a display tube for which, like a gate array, the user can freely
design characters and patterns on the master layer (grid). (Pattern can be created without gaps
between grids.)
Since the outline dimensions of the display tube and the grid layout are predetermined,
desired patterns can be displayed in a short time.
The universal VF display tube is used for the display parts for audio equipment, household
appliances, and automobile equipment.
E2C0024-27-Y4
This version: Nov. 1997
Previous version: Jul. 1996
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MSC1230
¡ Semiconductor
BLOCK DIAGRAM
V
DD1
SEG37
SEG1
GRID3
GRID1
5V
POR
5V
REG.
37
37bit data
1
37
111 37-Segment Control
75
111
74
38 37
1
111-bit Latch
111-bit data
112 111
107106
97 96
1
112-bit Shift Register
112bits=0: Digital Dimming Mode
112bits=1: VF Data Input Mode
V
DD2
LGND
POR
37
37
CS
DATA-IN
CLOCK
Control
Circuit
OSC0
OSC1
10-bit Latch
10-bit Digital
Diming
Timing
Generator
POR
V
DD
=8 - 18V
V
CC
=5.0V
(Regurator)
OSC
V
DD
3
3-bit Grid Driver
DGND
37-bit Segment Driver
10-bit data
10-bit data
SEL
5V
INPUT AND OUTPUT CONFIGURATION
l
Schematic Diagram 1 of
Logic Portion Input Circuit
l
Schematic Diagram 2 of
Logic Portion Input Circuit
l
Schematic Diagram of
Driver Output Circuit
GND
V
DD
GND
INPUT
(5V Reg.)
GND
(5V Reg.)
V
DD
GND
COLn
GND
V
DD
GND
OUTPUT
V
DD
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MSC1230
¡ Semiconductor
PIN DESCRIPTION
Symbol
Type
Decription
SEG1 to 37
O
Output pins for segment signals for driving VF display tube.
GRID1 to 3
O
Output pins for grid signals for driving VF display tube.
The GRID3 output is not used when the universal VF display tube is used.
SEL
I
When at a "L" level, this pin selects 1/3-duty VF display tube.
When at a "H" level (or when used in the open state), this pin selects universal
VF display tube.
I
DATA-IN
CLOCK
OSC1
CS
V
DD1
V
DD2
V
DD3
LGND
Pin for series data input from microprocessor.
Data is input to the shift register on the rising edge of the CLOCK signal.
Serial clock input pin.
Data is input through the DATA-IN pin at the rising edge of the serial clock.
RC oscillator connecting pins.
Connect a resistor between the OSC1 and OSC0 pins and a capacitor between
the OSC0 pin and the ground.
Chip select input pin. Circuit operation is valid when this pin is at a "L" level.
Power supply pins. When using these pins, connect each of them to the power
supply.
Ground pins for driver and logic. These pins can be connected with each other
when they are used.
I
I
I
--
OSC0
Pin
34 to 46,
52 to 56,
1 to 19
30 to 32
25
28
27
24
26
23
47
51
29
49
--
O
DGND
21
--
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MSC1230
¡ Semiconductor
ABSOLUTE MAXIMUM RATINGS
RECOMMENDED OPERATING CONDITIONS
Parameter
Supply Voltage
High Level Input Voltage (1)
High Level Input Voltage (2)
Low Level Input Voltage (1)
Low Level Input Voltage (2)
Oscillation Frequency
Clock Frequency
Frame Frequency
Operating Temperature
Min.
Typ.
Max.
Symbol
Condition
Unit
All inputs except OSC0
f
OSC
=3.2 MHz
V
DD
V
IH1
V
IH2
V
IL1
V
IL2
f
C
f
OSC
f
FR
T
op
OSC0
All inputs except OSC0
OSC0
R=4.7 kW, C=10 pF
8
3.8
4.5
0.0
0.0
40
--
--
--
3.2
260
--
--
--
--
--
--
--
18
5.5
5.5
0.8
0.5
85
250
--
--
V
Hz
MHz
kHz
V
V
V
V
V
°C
--
--
--
Parameter
Supply Voltage
Input Voltage
Storage Temperature
Power Dissipation
Symbol
Condition
Ratings
Unit
V
DD
V
IN
T
STG
P
D
Ta=85°C
0.3 to +20
0.3 to +6.0
65 to +150
400
V
V
°C
mW
--
--
All inputs
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