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ML9209 Datasheet(PDF) 4 Page - OKI electronic componets

Part No. ML9209
Description  Vacuum fluorescent display tube controller driver
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Maker  OKI [OKI electronic componets]
Homepage  http://www.oki.com
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FEDL9209-01
OKI Semiconductor
ML9209-xx
4/29
PIN DESCRIPTION
Pin
Symbol
Type
Connects to
Description
28–38,
40–44
SEG1–16
O
VFD tube
anode
electrode
VFD tube anode electrode drive output.
Directly connected to the VFD tube and no pull-down resistor
is required.
IOH > –6 mA
1–16
COM1–16
O
VFD tube
grid
electrode
VFD tube grid electrode drive output.
Directly connected to the VFD tube and no pull-down resistor
is required.
IOH > –30 mA
26, 27
AD1–2
O
VFD tube
anode
electrode
VFD tube anode electrode drive output.
Directly connected to the VFD tube and no pull-down resistor
is required.
IOH > –15 mA
18, 25
VDD
20
GND
17,39
VFL
Power supply
The voltage supply between VDD and GND is for the power
supply for the internal logic.
The voltage supply between VDD and VFL is for the power
supply for driving the VFD tube.
Apply power to VDD first, then to VFL.
24
DA
I
Microcontroller
Serial data input pin (positive logic).
Data is input from the LSB.
23
CP
I
Microcontroller
Shift clock input pin.
Serial data is shifted in on a rising edge of
CP.
22
CS
I
Microcontroller
Chip select input pin.
Serial data transfer is disabled when
CS pin is “H” level.
21
RESET
l
Microcontroller
Reset input.
Setting this pin to “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 ............................ 16 digits
• Brightness adjustment............. 0/16
• All display lights ON or OFF .... OFF mode
• All outputs............................... Low level
Pin for RC oscillation.
Resistors and capacitors are connected externally and
constants vary depending on the VDD voltage used.
The target oscillation frequency is 2MHz.
19
OSC0
I/O
C1, R1
OSC0
R1
C1
(RC oscillator circuit)
*Refer to the Application
Circuit.




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