msm9223 Oki Semiconductor, msm9223 Datasheet - Page 4

• Manufacturer Part Number: msm9223
• Description: 27-bit Duplex/triplex Vfd Controller/driver With Digital Dimming, Adc And Keyscan
• Manufacturer: Oki Semiconductor

¡ Semiconductor
PIN DESCRIPTIONS
40 to 50,
60 to 64,
52 to 59
34 to 39
14 to 18
9 to 13
5, 6, 7
20, 21
2 to 4
1, 51
Pin
26
24
33
29
28
27
22
23
8
SEG20 to 27
SEG1 to 19
GRID1 to 3
ROW1 to 5
COL1 to 5
DATA I/O
Symbol
DUP/TRI
CH1 to 6
D-GND
CLOCK
L-GND
A1, B1
V
V
V
INT
CS
REG
DD
CC
Type
I/O
—
—
—
O
O
O
O
O
O
O
O
I
I
I
I
I
Power supply pins.
Pin1 and pin51 should be connected externally.
D-GND is ground pin for the VFD driver circuit. L-GND is ground pin for the
logic circuit. Pins 8 and 26 should be connected externally.
5V output pin for internal logic portion and external logic circuit.
Reference voltage (5V) output pin for A/D converter.
Segment (anode) signal output pins for a VFD tube.
These pins can be directly connected to the VFD tube. External circuit is not required.
I
Segment (anode) signal output pins for a VFD tube.
These pins can be directly connected to the VFD tube. External circuit is not required.
I
Inverted Grid signal output pins.
For pre-driver, the external circuit is requiend.
I
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 I/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.
Duplex (1/2 duty) operation is selected when this pin is set at a V
Triplex (1/3 duty) operation is selected when this pin is set at a GND level.
Analog voltage input pin for the 8-bit A/D converter.
Input pin for the encoder type rotary switch. Each input has chattering
absorption function of 620ns typical.
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 cahttering 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.
OH
OH
OL
£10 mA
£–5 mA
£–10 mA
Description
MSM9223
CC
level.
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