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PT6332 V1.0

- 34 -

February, 2006

VFD Driver/Controller IC

PT6332

APPLICATION CIRCUIT

21

22

23

24

25

26

27

32

28

33

37

29

34

38

30

35

39

31

36

40

70

65

61

71

66

62

72

67

63

73

68

64

74

69

75

76

77

78

79

80

SG40

SG39

SG38

SG37

SG36

SG33

SG28

SG24

SG34

SG29

SG35

SG32

SG27

SG23

SG31

SG26

SG22

SG30

SG25

SG21

KI4

KS4

VSS1

KI5

KS5

KS1

DT

KI1

KS2

/BLK

KI2

KS3

DO

KI3

CE

DI

VDD

OSCI

VSS2

CL

PT6332

MCU

5V/3.3V

12K

33p

VDD

Key matrix with up to 25 keys

*

Note: *- Since DO is an open-drain output, a pull-up resistor is required. Select a value in the range 1 to

10KΩ that is most appropriate for the capacitance of the external lines so that the waveform is not

distorted.