LC75741W(1995) データシートの表示（PDF） - SANYO -> Panasonic

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LC75741W
(Rev.:1995)

1/2 Duty VFD Driver for Frequency Displays

SANYO -> Panasonic 

LC75741E, 75741W

Correspondence between Display Data (SD1 to SD106) and Segment Output Pins

Segment

output pin

S1

S2

S3

S4

S5

S6

S7

S8

S9

S10

S11

S12

S13

S14

S15

S16

S17

S18

S19

S20

S21

S22

S23

S24

S25

S26

S27

G1

SD1

SD2

SD3

SD4

SD5

SD6

SD7

SD8

SD9

SD10

SD11

SD12

SD13

SD14

SD15

SD16

SD17

SD18

SD19

SD20

SD21

SD22

SD23

SD24

SD25

SD26

SD27

G2

SD54

SD55

SD56

SD57

SD58

SD59

SD60

SD61

SD62

SD63

SD64

SD65

SD66

SD67

SD68

SD69

SD70

SD71

SD72

SD73

SD74

SD75

SD76

SD77

SD78

SD79

SD80

Segment

output pin

S28

S29

S30

S31

S32

S33

S34

S35

S36

S37

S38

S39

S40

S41

S42

S43

S44

S45

S46

S47

S48

S49

S50

S51

S52

S53

G1

SD28

SD29

SD30

SD31

SD32

SD33

SD34

SD35

SD36

SD37

SD38

SD39

SD40

SD41

SD42

SD43

SD44

SD45

SD46

SD47

SD48

SD49

SD50

SD51

SD52

SD53

G2

SD81

SD82

SD83

SD84

SD85

SD86

SD87

SD88

SD89

SD90

SD91

SD92

SD93

SD94

SD95

SD96

SD97

SD98

SD99

SD100

SD101

SD102

SD103

SD104

SD105

SD106

For example, the table below lists the segment output states for the S11 segment output pin.

Display data

SD11

SD64

0

0

0

1

1

0

1

1

Segment output pin (S11) state

Both segments for the G1 and G2 digit output pins are off

Segment for the G2 digit output pin is on

Segment for the G1 digit output pin is on

Both segments for the G1 and G2 digit output pins are on

BLK and the Display Control

Since the LSI internal data (SD1 to SD106 and DM0 to DM9) is undefined when power is first applied, the display is off

(S1 to S53, G1 and G2 = low) by setting the BLK pin low at the same time as power is applied. Then, meaningless

display at power-on can be prevented by transferring all 144 bits of serial data from the controller while the display is off

and setting BLK pin high after the transfer completes. (See Figure 3.)

Power Supply Sequence

Observe the following sequences when turning the power on and off. (See Figure 3.)

• Power on: Logic block power supply (VDD) on → Driver block power supply (VFL) on

• Power off: Driver block power supply (VFL) off → Logic block power supply (VDD) off

No. 4965-6/10

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