E2C0024-27-Y4
¡ Semiconductor
¡ Semiconductor
MSC1230
This version: Nov. 1997
MSC1230
Previous version: Jul. 1996
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.
1/13
¡ Semiconductor
MSC1230
PIN DESCRIPTION
Pin
34 to 46,
52 to 56,
1 to 19
30 to 32
25
Symbol
SEG1 to 37
Type
Decription
O
Output pins for segment signals for driving VF display tube.
GRID1 to 3
SEL
O
I
Output pins for grid signals for driving VF display tube.
The GRID3 output is not used when the universal VF display tube is used.
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.
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.
28
27
DATA-IN
CLOCK
I
I
24
23
26
47
51
29
49
21
OSC0
OSC1
CS
V
DD1
V
DD2
V
DD3
DGND
LGND
I
O
I
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—
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