Control Data

• S0, S1: Sleep control data

This control data controls switching between sleep mode and normal mode, and also sets the states of the KS1 to KS6

key scan output pins in key scan standby mode.

• DM0 to DM9: Dimmer data

This data controls the duty of the G1, G2 digit output pins. This data forms a 10-bit binary value in which D0 is the

LSB. The brightness of the display can be controlled by adjusting the duty of the G1, G2 digit output pins. The table

lists the relationship between the dimmer data and the dimmer value.

t3 and t4: See figure 5.

Relationship between the Display Data (D1 to D82) and the Segment Output Pins

As an example, the table below lists the operation of the S11 segment output pin.

No. 6142-7/18

LC75742E, LC75742W

Control data

Mode

Clock generator

Segment outputs

Output pin states during key scan standby

S0

S1

(oscillator circuit)

Digit output

KS1

KS2

KS3

KS4

KS5

KS6

0

0

Normal

Oscillator operating

Operating

H

H

H

H

H

H

0

1

Sleep

Stopped

L

L

L

L

L

L

H

1

0

Sleep

Stopped

L

L

L

L

L

H

H

1

1

Sleep

Stopped

L

H

H

H

H

H

H

DM9

DM8

DM7

DM6

DM5

DM4

DM3

DM2

DM1

DM0

Dimmer value (t4/t3)

0

0

0

0

0

0

0

0

0

0

0/1024

0

0

0

0

0

0

0

0

0

1

1/1024

0

0

0

0

0

0

0

0

1

0

2/1024

to

to

1

1

1

1

1

1

1

1

0

0

1020/1024

1

1

1

1

1

1

1

1

0

1

1021/1024

1

1

1

1

1

1

1

1

1

0

1022/1024

1

1

1

1

1

1

1

1

1

1

Illegal setting

Segment

G1

G2

output pin

S1

D1

D42

S2

D2

D43

S3

D3

D44

S4

D4

D45

S5

D5

D46

S6

D6

D47

S7

D7

D48

S8

D8

D49

S9

D9

D50

S10

D10

D51

S11

D11

D52

S12

D12

D53

S13

D13

D54

S14

D14

D55

Segment

G1

G2

output pin

S15

D15

D56

S16

D16

D57

S17

D17

D58

S18

D18

D59

S19

D19

D60

S20

D20

D61

S21

D21

D62

S22

D22

D63

S23

D23

D64

S24

D24

D65

S25

D25

D66

S26

D26

D67

S27

D27

D68

S28

D28

D69

Segment

G1

G2

output pin

S29

D29

D70

S30

D30

D71

S31

D31

D72

S32

D32

D73

S33

D33

D74

S34

D34

D75

S35

D35

D76

S36

D36

D77

S37

D37

D78

S38

D38

D79

S39

D39

D80

S40

D40

D81

S41

D41

D82

Display data

Segment output pin (S11) state

D11

D52

0

0

The segments corresponding to the G1 and G2 digit output pins are off

0

1

The segment corresponding to the G2 digit output pin is turned on

1

0

The segment corresponding to the G1 digit output pin is on

1

1

The segments corresponding to the G1 and G2 digit output pins are on