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PDF MSC1209 Data sheet ( Hoja de datos )
| Número de pieza | MSC1209 | |
| Descripción | 42-Bit Vacuum Fluorescent Display Tube Driver | |
| Fabricantes | OKI electronic componets | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MSC1209 (archivo pdf) en la parte inferior de esta página. Total 16 Páginas | ||
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E2C0020-29-53
¡¡SemicondSucetormiconductor
MSC1209
This version: MMaySC19192909
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42-Bit Vacuum Fluorescent Display Tube Driver with Digital Dimming Function
GENERAL DESCRIPTION
The MSC1209 is a Bi-CMOS display driver for a 1/2-duty vacuum fluorescent display tube. The
MSC1209 consists of an 84-bit shift register, an 84-bit latch circuit, a 10-bit digital dimming circuit,
42-bit segment drivers, a 2-bit grid circuit, and a cascade control circuit.
The MSC1209 is interfaced with a microcontroller by using three signal lines of LOAD, CLOCK,
and DATA. The cascaded MSC1209 ICs can share LOAD, CLOCK, and DATA.
FEATURES
• Power supply voltage: 8V to 18V (Built-in 5V regulator for logic)
• Operating temperature range: –40 to +105°C
• Driving 42 segments directly: VOH=VDD–0.5V at IOH=–3.0mA (VDD=15.0V)
• Built-in digital dimming circuit
10-bit resolution
Programmable in the duty range of 0/2048 (0%) to 1016.5/2048 (49.6%)
• 3 interfaces with microcontroller: LOAD, CLOCK, DATA
• Cascade connection available
(The cascaded MSC1209 ICs can share LOAD, CLOCK, and DATA.)
• Built-in oscillation circuit with an external capacitor (a single pin is used)
• Built-in power-on reset circuit
• Package:
56-pin plastic QFP (QFP56-P-910-0.65-2K) (Product name: MSC1209GS-2K)
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¡ Semiconductor
PIN DESCRIPTION
MSC1209
www.DataSheet4U.com
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 VDD — Power source Power supply pin (8V to 18V).
47 VSS — Power source GND pin. (Ground)
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¡ Semiconductor
Oscillator
MSC1209
www.DataSheet4U.com
Connect an external capacitor (C), as shown in Figure 4. The oscillating frequency fOSC depends
on the external capacitor used. The following equation is true between fOSC and grid frequency
(fGRID):
fGRID = fOSC/2048
OSC Pin
fOSC
C (68pF)
Figure 4 Oscillator Equivalent Circuit
Dimming Function
The duty cycle of grid output can be changed in 1/2048 step with respect to 10-bit dimming data.
Table 1 shows the relationship between dimming data and duty ratio.
Table 1 Dimming Data and Duty Ratio
(MSB)
00
00
11
11
11
11
Dimming Data
0000
0000
1111
1111
1111
1111
(LSB)
0000
0001
0111
1000
1001
1110
Duty Ratio
0/2048
1/2048
1015/2048
1016/2048
1016.5/2048
1016.5/2048
Max
Ø
Max
Note: Setting for address 3FFH is invalid.
Duty ratios are programmable within the range of 0/2048 (0%) to 1016.5/2048 (49.6%). Figure
5 shows the grid output timing.
Cascade Connection
When two MSC1209 ICs are used in cascade connection, use the MODEA and MODEB pins to
connect them, as shown below.
MSC1209
(Master)
MODEA
MODEB
OSC
SEL
5V
MSC1209
(Slave)
MODEA
MODEB
OSC
SEL
OPEN
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11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet MSC1209.PDF ] | |
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