ML9228 データシートの表示（PDF） - Oki Electric Industry

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ML9228

82-Bit Duplex/Triplex VFD Controller/Driver with Digital Dimming, Keyscan

Oki Electric Industry 

OKI Semiconductor

FEDL9228-01

ML9228

Pin

12,42

14

13,41

37

3 to 11,

46 to 62,

67 to 100,

105 to 126

Symbol

VDISP

VDD

D-GND

L-GND

SEG1 to 82

43,44,45 GRID1 to 3

30

CS

31

CLOCK

32

DATA l/O

15

INT

27

DUP/TRl

21 to 26

COL1 to 6

16 to 20 ROW1 to 5

28

BLANK

PIN DESCRIPTIONS

Type

—

—

—

—

O

O

l

l

l/O

O

l

l

O

I

Description

High Level Power supply pins

Pin12 and pin42 should be connected externally.

Low Level Power supply pin

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

the logic circuit. Pin13,Pin37 and Pin41 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.

lOH ≤ –6 mA, lOL ≤ 500 µΑ

Inverted Grid signal output pins

For pre-driver, the external circuit is required.

lOH ≤ –6 mA, lOL ≤ 10 mA

Chip Select input pin

Data input/output operation is valid when this pin is set at a High level.

Serial clock input pin

Data is input and/or output through the DATA l/O pin at the rising edge of

the serial clock.

Serial data input/output pin

Data is input to/comes out from the shift register at the rising edge of the

serial clock.

Interrupt signal output to microcontroller. When any key of key matrix is

pressed or released, key scanning is started. After the completion of the

one cycle, this pin goes to high level and keeps the high level until

keyscan stop mode is selected.

Duplex/Triplex operation select input pin.

DUP/TRl = L(L-GND) : Triplex

DUP/TRl = H(VDD) : Duplex

Return inputs from the key matrix

These pins are active low. When key matrix are in the inactive sate,

these pins are at high level through the internal pull-up resistors. All the

inputs do not have the chattering absorption function for the keyscans.

Key switch scanning outputs

Normally low level is output through these pin. When any switch of key

matrix is depressed or released, key scanning is started and is continued

until keyscan stop mode is selected. When keyscan stop mode is

selected, all outputs of ROW1 to 5 go back to low level.

Display off control input.

BLANK = L(L-GND) : Display off(SEG1-82 = L)

BLANK = H(VDD) : Display on

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