MSC1209 Datasheet, PDF (5/16 Pages) OKI electronic componets – 42-Bit Vacuum Fluorescent Display Tube Driver with Digital Dimming Function

¡ Semiconductor
MSC1209
PIN DESCRIPTION
Pin
Symbol Type Connected to
48
DATA
I Microcontroller
50
CLOCK
I Microcontroller
51
LOAD
I Microcontroller
1 to 20,
22 to 40, SEG1 to SEG42
54 to 56
O
Anode electrode
of VFD tube
42
GRID1
O
Grid electrode
of VFD tube
43
GRID2
O
Grid electrode
of VFD tube
44
BLANK
I
—
45
OSC
I/O
—
46
MODEA
I
—
52
MODEB
Description
Serial data input. (Positive logic)
Receives display data and dimming data.
Shift clock input.
Serial data is shifted on the rising edge of this shift clock
pulse.
Load pulse input.
The load signal is input when the transfer of serial data is
completed.
Segment driver output.
Grid driver output. When this pin is set to "L", the display
goes on. Connect an external PNP transistor to this pin.
The segment data of the first bit (S1) to the 42nd bit (S42) is
valid in the 84-bit segment data.
Grid driver output. When this pin is set to "L", the display
goes on. Connect an external PNP transistor to this pin.
The segment data of the 43rd bit (S43) to the 84th bit (S84)
is valid in the 84-bit segment data.
Input with pull-up resistor for display blank. When this pin is
set to "L", the display goes off. (SEGn="L")
Input and output for oscillation. Connect an external
capacitor of 68pF.
The typical value of oscillating frequency
45 _68pF
is 512kHz.
These pins specify the operating mode.
MODEA
0
1
0
1
MODEB
0
0
1
1
Operating Mode
Master Operation
Test Mode
Slave Operation
Slave Operation
SEL pin of the master IC outputs switching signals for the
53
SEL
O
MODEA pin
at slave side
segment data that corresponds to the grid signals. The SEL
pin of the master IC is connected to the MODEA pin of the
slave IC.
41
V_DD
— Power source Power supply pin (8V to 18V).
47
V_SS
— Power source GND pin. (Ground)
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