¡ Semiconductor

ML9211

6/19

PIN DESCRIPTIONS

Symbol

QFP-1

*

Type

Description

65, 80

—

Power supply pins for VFD driver circuit.

These should be connected externally.

25

—

Power supply pin for logic drive.

D-GND

24, 40

—

L-GND

33

—

SEG1 to 37

42 to 64,

66 to 79

O

D-GND is ground pin for the VFD driver circuit. L-GND is ground pin for the

logic circuit. These should be connected externally.

Segment (anode) signal output pins for a VFD tube. These pins can be directly

connected to the VFD tube. External circuit is not required.

SEG38 to 56 1 to 19

O

Segment (anode) signal output pins for a VFD tube.These pins can be directly

connected to the VFD tube. External circuit is not required.

GRID2

21

O

Inverted Grid signal output pins. For pre-driver, the external circuit is required.

CS

29

I

Chip select input pin.

Data is not transferred when CS is set to a Low level.

CLOCK

30

I

Shift clock input pin.

Serial data shifts at the rising edge of the CLOCK.

DATA IN

31

I

Serial data input pin (positive logic).

Data is input to the shift register at the rising edge of the CLOCK signal.

DUP/TRI

35

I

Duplex/Triplex operation select input pin.

Triplex (1/3 duty) operation is selected when this pin is set to L-GND.

M/S

36

I

Master/Slave mode select input pin.

Slave mode is selected when this pin is set to L-GND.

Dimming pulse input.

When the slave mode is selected, connect this pin to the master side DIM

OUT pin at the slave mode. The pulse width of the all segment output are

controlled by a input pulse width of DIM IN.

When the master mode is selected, the input level of this pin is ignored.

all grids and segment outputs are controlled by a built-in 10-bit dimming circuit.

DIM IN

26

I

SYNC IN 2

28

I

Synchronous signal input.

When the slave mode is selected, connect these pins to the master side SYNC

OUT 1 and 2 pins.

When the master mode is selected, the input level of these pins are ignored.

DIM OUT

39

O

Dimming pulse output.

Connect this pin to the slave side DIM IN pin.

QFP-2

*

63 78

23

22, 38

31

40 to 62,

64 to 77

79, 80,

1 to 17

19

27

28

29

33

34

24

26

37

20

18

22

20

GRID1

GRID3

SYNC IN 1

27

25

Pin