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MSC1230

111-Bit 2/3-Duty Controller/Driver with Digital Dimming Function

Oki Electric Industry 

¡ Semiconductor

5) Input Format for Dimming Data

Byte c7 c6 c5 c4 c3 c2 c1 c0

1

8

7

6

5

4

3

2

1

2 M0 xx xx xx xx xx 10 9

6) Function Mode

M0

FUNCTION

0

Display Data Input Mode

1

Digital Dimming Data Input Mode

MSC1230

GRID/SEG Driver Operation and Digital Dimming

Figures 4 and 5 show the timing for the GRID and SEG drivers in universal VFD mode and

1/3 duty VFD mode, respectively.

Figure 6 shows an example of timing for digital dimming operation in 1/3 duty VFD mode.

(When the duty cycle in the dimming data is 508/1024)

GRID1

GRID2

3072 bit time

(1 display cycle)

GRID3

SEG1-37

3 bit time

1019 bit time

5 bit time

1024 bit time

8 bit time

* 1 bit time=4/fOSC

Figure 4. Duty Cycle Timing (Universal VFD Mode)

11/13

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