FEDL9208-01
OKI Semiconductor
ML9208
PIN DESCRIPTION
Pin
QFP
1 to 31,
61 to 64
SSOP
Symbol
Type
Connects to
Fluorescent
tube anode
electrode
Fluorescent
tube grid
electrode
Fluorescent
tube anode
electrode
LED drive
control pins
Description
Fluorescent display tube anode electrode drive output.
Directly connected to fluorescent display tube and a
pull-down resistor is not necessary. I
OH
> –6 mA
Fluorescent display tube grid electrode drive output.
Directly connected to fluorescent display tube and a
pull-down resistor is not necessary. I
OH
> –30 mA
Fluorescent display tube anode electrode drive output.
Directly connected to fluorescent display tube and a
pull-down resistor is not necessary. I
OH
> –15 mA
General port output.
Output of these pins in static operation, so these pins can
drive the LED.
V
DD
-GND are power supplies for internal logic.
—
Power supply
V
DD
-V
FL
are power supplies for driving fluorescent tubes.
Apply V
FL
after V
DD
is applied.
Serial data input (positive logic).
Input from LSB.
Shift clock input.
Serial data is shifted on the rising edge of
CP.
Chip select input.
Serial data transfer is disabled when
CS
pin is “H” level.
Reset input.
“Low” initializes all the functions.
Initial status is as follows.
•
Address of each RAM
⋅⋅⋅⋅
address “00”H
•
Data of each RAM
⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅
Content is undefined
52
60
RESET
I
•
Display digit
⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅
16 digits
Microcontroller
•
Contrast adjustment
⋅⋅⋅⋅⋅⋅⋅
8/16
or C
2
, R
2
•
All lights ON or OFF
⋅⋅⋅⋅⋅⋅⋅
OFF mode
•
All outputs
⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅
“Low” level
RESET
5 to 39 SEG1 to 35
O
32 to 47 40 to 55 COM1 to 16
O
59, 60
3, 4
AD1, AD2
O
57, 58
56
49
48
55
54
53
1, 2
64
57
56
63
62
61
P1, P2
V
DD
GND
V
FL
DA
CP
CS
O
I
I
I
Microcontroller
Microcontroller
Microcontroller
(Circuit when R and C are
connected externally)
C
2
R
2
See Application Circuit.
External RC pin for RC oscillation.
50
58
OSC0
I
C
1
, R
1
OSC0
51
59
OSC1
O
OSC1
R
1
(RC oscillation circuit)
C
1
See Application Circuit.
Connect R and C externally. The RC time constant
depends on the V
DD
voltage used. Set the target oscillation
frequency to 2 MHz.
5/33
OKI [ OKI ELECTRONIC COMPONETS ]
