ML9209 datasheet(4/29 Pages) LAPIS

4 / 29 page

FEDL9209-01

LAPIS Semiconductor

ML9209-xx

4/29

PIN DESCRIPTION

Symbol

Type

Connects to

Description

28–38,

40–44

SEG1–16

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

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

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

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.

Microcontroller

Serial data input pin (positive logic).

Data is input from the LSB.

Microcontroller

Shift clock input pin.

Serial data is shifted in on a rising edge of

CP.

Microcontroller

Chip select input pin.

Serial data transfer is disabled when

CS pin is “H” level.

RESET

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.

OSC0

I/O

C1, R1

OSC0

(RC oscillator circuit)

*Refer to the Application

Circuit.

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