FEDL9205-03
1
Semiconductor
ML9205-01
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
COM1 to
Fluorescent tube output. Directly connected to fluorescent display
39 to 62 41 to 64
O
24
grid electrode
tube and a pull-down resistor is not necessary.
IOH > –50.0 mA
Fluorescent display tube anode electrode drive
1, 2, 79,
1 to 4
80
Fluorescent tube output. Directly connected to fluorescent display
anode electrode tube and a pull-down resistor is not necessary.
AD1 to AD4
O
O
I
OH > –10.0 mA
General port output. Output of these pins in
static operation, so these pins can drive the
LED. IOH > –2.0 mA
LED anode
electrode
72 to 75 74 to 77
P1 to P4
71
38, 78
64
73
40, 80
66
VDD
VDISP1 to 2
GND
VDD-GND are power supplies for internal logic.
V
DISP-VFL are power supplies for driving
fluorescent tubes. Use the same power supply
for VDD and VDISP
—
Power supply
.
63, 76
70
65, 78
72
VFL1 to 2
DA
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.
Reset input.
69
68
71
70
CP
CS
I
Microcontroller
"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 adjusment .... 8/16
• All lights ON or OFF ....... OFF mode
• All outputs ...................... "Low" level
Microcontroller
or C2, R2
67
69
RESET
l
C2
R2
(Circuit when R and C are connected externally)
See Application Circuit.
External RC pin for RC oscillation.
Connect R and C externally. The RC time
constant depends on the VDD voltage used. Set
the target oscillation frequency to 2 MHz.
OSC0
65
66
67
68
OSC0
OSC1
I
C1, R1
R1
C1
OSC1
O
(RC oscillation circuit) See Application Circuit.
* QFP1 : QFP80-P-1414-0.65-K
QFP2 : QFP80-P-1420-0.80-BK
6/34
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