LC75878W 데이터 시트보기 (PDF) - ON Semiconductor

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LC75878W

1/8 to 1/10-Duty General-Purpose LCD Driver

ON Semiconductor 

Control Data Functions

LC75878W

1. PC1 to PC4: General-purpose output port state setting data

These control data bits set the states of the general-purpose output ports P1 to P4.

Output pin

P1

P2

P3

P4

General-purpose output port state setting data

PC1

PC2

PC3

PC4

For example, if PC1 and PC2 are set to 1, and PC3 and PC4 are set to 0, then the output pins P1 and P2 will output

high levels (VDD) and the output pins P3 and P4 will output low levels (VSS).

2. CT0 to CT3, CTC: Display contrast setting data

These control data bits set the display contrast.

CT0 to CT3: Display contrast setting (11 steps)

CT0

CT1

CT2

CT3

LCD drive 4/4 bias voltage supply VLCD0 level

0

0

0

0

0.94VLCD=VLCD-(0.03VLCD2)

1

0

0

0

0.91VLCD=VLCD-(0.03VLCD3)

0

1

0

0

0.88VLCD=VLCD-(0.03VLCD4)

1

1

0

0

0.85VLCD=VLCD-(0.03VLCD5)

0

0

1

0

0.82VLCD=VLCD-(0.03VLCD6)

1

0

1

0

0.79VLCD=VLCD-(0.03VLCD7)

0

1

1

0

0.76VLCD=VLCD-(0.03VLCD8)

1

1

1

0

0.73VLCD=VLCD-(0.03VLCD9)

0

0

0

1

0.70VLCD=VLCD-(0.03VLCD10)

1

0

0

1

0.67VLCD=VLCD-(0.03VLCD11)

0

1

0

1

0.64VLCD=VLCD-(0.03VLCD12)

CTC: Display contrast adjustment circuit state setting

CTC

Display contrast adjustment circuit state

0

The display contrast adjustment circuit is disabled, and the VLCD0 pin level is forced to the VLCD level.

1

The display contrast adjustment circuit operates and the display contrast is adjusted.

Note that although the display contrast can be adjusted by operating the built-in display contrast adjustment circuit, it

is also possible to apply fine adjustments to the contrast by connecting an external variable resistor to the VLCD4 pin

and modifying the VLCD4 pin voltage. However, the following conditions must be met: (VLCD0 – VLCD4)  4.5 V,

and 1.5 V  VLCD4  0 V.

3. SC: Segment on/off control data

This control data bit controls the on/off state of the segments.

SC

Display state

0

On

1

Off

However, note that when the segments are turned off by setting SC to 1, the segments are turned off by outputting

segment off waveforms from the segment output pins.

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