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MSC1230

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

Oki Electric Industry 

¡ Semiconductor

MSC1230

FUNCTIONAL DESCRIPTION

Power-on Reset

When power is turned on, the IC is initialized by the internal power-on reset circuit. The status

of the internal circuit after initialization is as follows:

– The contents of the shift registers and latches are set to "0".

– The digital dimming duty cycle is set to "0".

Data Input

Data input to the DATA-IN pin is valid only when the CS pin is at a "L" level.

The input data to DATA-IN is shifted into the shift registers on the rising edge of the clock. The

data is automatically loaded to the latches on the rising edge of the CS pin.

When M0 = "1", the IC enters the display data input mode and a total of 112 bits of data are input.

When M0 = "0", the IC enters the digital dimming data input mode and a total of 16 bits of data

are input.

[Data Format]

1) Display Data Input Mode

Input Data

:

VF Display Data

:

Mode Select Data (M0) :

112 bits

111 bits

1 bit

Bit 112 111 110 .... 97 96 95 94 93 92 91 .... 4 3 2 1 First in

M0 D111 D110 .... D97 D96 D95 D94 D93 D92 D91 .... D4 D3 D2 D1

Mode

Data

Display Data (111 bits)

(1 bit)

2) Bit correspondence between segment outputs and shift registers

37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 SEG

37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 G1

BIT 74 73 72 71 70 69 68 67 66 65 64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49 48 47 46 45 44 43 42 41 40 39 38 G2

111 110 109 108 107 106 105 104 103 102 101 100 99 98 97 96 95 94 93 92 91 90 89 88 87 86 85 84 83 82 81 80 79 78 77 76 75 G3

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