FEDL9207-02
OKI Semiconductor
ML9207-xx
PIN DESCRIPTION
Pin
Symbol
Type
O
Connects to
Description
Fluorescent display tube anode electrode drive
QFP-1 * QFP-2*
Fluorescent tube output. Directly connected to fluorescent display
anode electrode tube and a pull-down resistor is not necessary.
IOH > –5.0 mA
3 to 37
5 to 39 SEG1 to 35
Fluorescent display tube grid electrode drive
Fluorescent tube
grid electrode
output. Directly connected to fluorescent display
tube and a pull-down resistor is not necessary.
IOH > –50.0 mA
39 to 62 41 to 64 COM1 to 24
1, 2, 79,
O
Fluorescent display tube anode electrode drive
Fluorescent tube output. Directly connected to fluorescent display
anode electrode tube and a pull-down resistor is not necessary.
IOH > –10.0 mA
1 to 4
AD1 to AD4
O
O
80
General port output. Output of these pins in
LED anode
electrode
72 to 75 74 to 77
P1 to P4
static operation, so these pins can drive the
LED. IOH > –2.0 mA
71
38, 78
64
63, 76
70
73
40, 80
66
65, 78
72
VDD
VDISP1 to 2
GND
VFL1 to 2
DA
VDD-GND are power supplies for internal logic.
VDISP-VFL are power supplies for driving
—
Power supply
fluorescent tubes. Use the same power supply
for VDD and VDISP
.
I
I
Microcontroller
Microcontroller
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.
69
68
71
70
CP
CS
I
Microcontroller
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
67
69
RESET
l
Microcontroller
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)
65
66
67
68
OSC0
OSC1
I
Crystal or
ceramic
resonator
O
See Application Circuit.
* QFP1 : QFP80-P-1414-0.65-K
QFP2 : QFP80-P-1420-0.80-BK
6/35
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