FEDL9205-03
1
Semiconductor
ML9205-01
APPLICATION CIRCUIT
Heater Transformer
5 × 7-dot matrix fluorescent display tube
ANODE
ANODE
GRID
(SEGMENT)(SEGMENT)(DIGIT)
VDD
VDD
4
35
24
R
C
VDD
VDD, AD1-4 SEG1-35 COM1-24
VDISP1-2
RESET
R4
LED
Micro-
controller
VDD
C3
ML9205 -xx
CS
CP
DA
4
NPN Tr
GND
Output Port
GND
P1-4
OSC0 OSC1
GND VFL1-2
R1
C1
R3
GND
GND
VFL
C4
ZD
Notes: 1. The VDD value depends on the power supply voltage of the microcontroller used. Adjust the
values of the constants R1, R2, R4, C1, and C2 to the power supply voltage used.
2. The VFL value depends on the fluorescent display tube used. Adjust the values of the
constants R3 and ZD to the power supply voltage used.
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