FEDL9207-02
OKI Semiconductor
ML9207-xx
PIN DESCRIPTION
Pin
QFP-1 *
3 to 37
QFP-2*
5 to 39
Symbol
Type
Connects to
Description
Fluorescent display tube anode electrode drive
output. Directly connected to fluorescent display
tube and a pull-down resistor is not necessary.
I
OH
> –5.0 mA
Fluorescent display tube grid electrode drive
output. Directly connected to fluorescent display
tube and a pull-down resistor is not necessary.
I
OH
> –50.0 mA
Fluorescent display tube anode electrode drive
output. Directly connected to fluorescent display
tube and a pull-down resistor is not necessary.
I
OH
> –10.0 mA
General port output. Output of these pins in
static operation, so these pins can drive the
LED. I
OH
> –2.0 mA
V
DD
-GND are power supplies for internal logic.
V
DISP
-V
FL
are power supplies for driving
fluorescent tubes. Use the same power supply
for V
DD
and V
DISP
.
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
• Display digit .................. 24 digits
• Brightness adjustment .. 0/1024
• All lights ON or OFF ..... OFF mode
• All outputs .................... "Low" level
Pins for self-oscillation.
(Do not apply external clocks to these pins.)
Connect these pins to the crystal and capacitors
or to the ceramic resonator and capacitors.
The target oscillation frequency is 4.0 MHz.
(Note that the device includes the feed back
resistor of 1 MΩ)
See Application Circuit.
SEG1 to 35
O
Fluorescent tube
anode electrode
39 to 62
41 to 64 COM1 to 24
O
Fluorescent tube
grid electrode
1, 2, 79,
80
1 to 4
AD1 to AD4
O
Fluorescent tube
anode electrode
LED anode
electrode
72 to 75
71
38, 78
64
63, 76
70
69
68
74 to 77
73
40, 80
66
65, 78
72
71
70
P1 to P4
V
DD
V
DISP1 to 2
GND
V
FL1 to 2
DA
CP
CS
O
—
Power supply
I
I
I
Microcontroller
Microcontroller
Microcontroller
67
69
RESET
l
Microcontroller
65
67
OSC0
I
Crystal or
ceramic
resonator
66
68
OSC1
O
* QFP1 : QFP80-P-1414-0.65-K
QFP2 : QFP80-P-1420-0.80-BK
6/35
OKI [ OKI ELECTRONIC COMPONETS ]
