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MSC1209 Datasheet(PDF) 11 Page - OKI electronic componets

Part No. MSC1209
Description  42-Bit Vacuum Fluorescent Display Tube Driver with Digital Dimming Function
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Maker  OKI [OKI electronic componets]
Homepage  http://www.oki.com
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MSC1209 Datasheet(HTML) 11 Page - OKI electronic componets

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¡ Semiconductor
MSC1209
11/15
Oscillator
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
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
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
MSC1209
(Slave)
MODEA
MODEB
OSC
SEL
5V
OPEN
(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
C (68pF)
fOSC
OSC Pin


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