PEDL9204-02
OKI Semiconductor
ML9204-xx
PIN DESCRIPTION
Pin
Symbol
Type
O
Connects to
Description
33 to 67 SEGA1 to A35
1 to 6
VFD tube anode electrode drive output.
Directly connected to fluorescent display tube and a
pull-down resistor is not necessary. IOH < –5 mA
VFD tube anode
electrode
SEGB1 to B35
100 to
128
VFD tube grid electrode drive output.
Directly connected to fluorescent display tube and a
pull-down resistor is not necessary. IOH < –25 mA
VFD tube grid
electrode
8 to 31
COM1 to 24
O
O
VFD tube anode electrode drive output.
Directly connected to fluorescent display tube and a
pull-down resistor is not necessary. IOH < –15 mA
68
99
ADA
ADB
VFD tube anode
electrode
96
71
VDD
L-GND
VCOM
V
DD-L-GND are power supplies for internal logic.
VCOM-D-GND are power supplies for driving VFD tube
grid.
—
Power supply
7,32
69,98
70,97
VCOM-D-GND are power supplies for driving VFD tube
anode.
Use the same power supply for L-GND and D-GND.
VSEG
D-GND
Serial data input-output (positive logic).
Data is input and output to sift register synchronized
with the rise of shift clock.
94
DI/O
I/O
Micro controller
When Inputting data input from the LSB.
Shift clock input.
Serial data is shifted on the rising edge of CP.
93
92
CP
CS
l
l
Micro controller
Micro controller
Chip select input.
Serial data transfer is disabled when CS pin is “H” level.
Output pin for interrupt signal to micro controller.
When depression or release of key matrix switch is
detected, key scanning starts and when 1 cycle is
completed, this pin becomes high level. Upon receiving
encoder type rotary switch input, this pin becomes high
level. The INT pin remains at high level until the key
scan stop mode is selected..
95
INT
O
Micro controller
Encoder type rotary switch input pins.
All inputs possess chattering absorption function of
256us period.
85,86
87,88
89,90
A1,B1
A2,B2
A3,B3
l
Rotary switch
Key matrix
Those inputs must be tied to ground when they are
not used.
Input pins for return signal from key matrix with built-in
pull-up resister.
When input is low level, the key matrix switch is
regarded as being pressed.
79 to 84
COL1 to 6
I
Dose not have chattering absorption function.
4/41
OKI [ OKI ELECTRONIC COMPONETS ]
