MSC1209 データシートの表示（PDF） - Oki Electric Industry

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MSC1209

42-Bit Vacuum Fluorescent Display Tube Driver with Digital Dimming Function

Oki Electric Industry 

¡ Semiconductor

MSC1209

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

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

Dimming Data

0000

0000

(LSB)

0000

0001

Duty Ratio

0/2048

1/2048

11

1111

0111

11

1111

1000

11

1111

1001

11

1111

1110

1015/2048

1016/2048

1016.5/2048

Max

Ø

1016.5/2048

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

SEL

MODEB

OSC

OPEN

11/15

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