MSC1209 datasheet(11/16 Pages) OKI

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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

OPEN

(MSB)

Dimming Data

0000

1111

(LSB)

0000

0001

0111

1000

1001

1110

Duty Ratio

0/2048

1/2048

1015/2048

1016/2048

1016.5/2048

Max

C (68pF)

fOSC

OSC Pin

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