FEDL9222-02
¡ Semiconductor
FEDL9222-02
This version: Feb. 2000
ML9222
Previous version: Nov. 1999
¡ Semiconductor
ML9222
GENERAL DESCRIPTION
32-Bit Duplex/Triplex VFD Controller/Driver with Digital Dimming, ADC and Keyscan
The ML9222 is a full CMOS controller/driver for Duplex or Triplex vacuum fluorescent display
tube. It conststs of 32-segment driver outputs and 3-grid pre-driver outputs, so that it can drive
directly up to 96-segment VFD.
ML9222 features a digital dimming function, a 8-ch ADC, a 5
¥
5 keyscan circuit and an encoder
type switch interface.
ML9222 provides an interface with a microcontroller only by four signal lines: DATA I/O,
CLOCK, CS and INT.
FEATURES
• Supply voltage (V
DD
)
• Duplex/Triplex selectable
• Applicable VFD tube
: 8 to 18.5V (Built-in 5V regulator for logic)
: 2 Grids
¥
32 Anodes VFD tube
: 3 Grids
¥
32 Anodes VFD tube
• 32-segment driver outputs
: I
OH
=–5mA at V
OH
=V
DD
–0.8V (SEG1 to 22)
I
OH
=–10mA at V
OH
=V
DD
–0.8V (SEG23 to 32)
• 3-grid pre-driver outputs
: I
OL
=10mA at V
OL
=2V
• Built-in digital dimming circuit (10-bit resolution)
• Built-in 8-ch A/D converter
• Built-in 5
¥
5 keyscan circuit
• 3 interface circuits for an encoder type rotary switch
• Built-in oscillation circuit (external R and C)
• Built-in Power-On-Reset circuit
• Package:
80-pin plastic QFP (QFP80-P-1420-0.80-BK)
Product name: ML9222GA
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FEDL9222-02
¡ Semiconductor
ML9222
PIN DESCRIPTIONS
Pin
1, 64
10
33
30
41
50 to 63,
65 to 67,
69 to 71,
73, 74
75, 76,
78 to 80,
2 to 6
7, 8, 9
GRID1 to 3
O
SEG23 to 32
O
Symbol
V
DD
D-GND
L-GND
V
CC
V
REG
SEG1 to 22
Type
—
—
—
O
O
O
Power supply pins.
Pin1 and pin64 should be connected externally.
D-GND is ground pin for the VFD driver circuit. L-GND is ground pin for the
logic circuit. Pins 8 and 26 should be connected externally.
5V output pin for internal logic portion and external logic circuit.
Reference voltage (5V) output pin for A/D converter.
Segment (anode) signal output pins for a VFD tube.
These pins can be directly connected to the VFD tube. External circuit is not required.
I
OH
£–5
mA
Segment (anode) signal output pins for a VFD tube.
These pins can be directly connected to the VFD tube. External circuit is not required.
I
OH
£–10
mA
Inverted Grid signal output pins.
For pre-driver, the external circuit is requiend.
I
OL
£10
mA
36
35
34
CS
CLOCK
DATA I/O
I
I
I/O
Chip Select input pin.
Data input/output operation is valid when this pin is set at a High level.
Serial clock input pin.
Data is input and/or output through the DATA I/O pin at the rising edge of the serial clock.
Description
Serial data input/output pin.
Data is input to / comes out from the shift register at the rising edge of the serial clock.
Interrupt signal output to microcontroller. When any key of key matrix is pressed
or released, key scanning is started. After the completion of the one cycle, this pin
goes to high level and keeps the high level until keyscan stop mode is selected.
Duplex/Triplex operation select input pin.
27
INT
O
29
42 to 49
21 to 26
DUP/TRI
CH1 to 8
A1 to A3
B1 to B3
I
I
I
Duplex (1/2 duty) operation is selected when this pin is set at a V
CC
level.
Triplex (1/3 duty) operation is selected when this pin is set at a GND level.
Analog voltage input pin for the 8-bit A/D converter.
Input pin for the encoder type rotary switch. Each input has chattering
absorption function of 620ns typical.
Return inputs from the key matrix.
These pins are active low. When key matrix are in the inactive sate, these
pins are at high level through the internal pull-up resistors. All the inputs do
not have the cahttering absorption function for the keyscans.
Key switch scanning outputs.
Normally low level is output through these pin. When any switch of key matrix
16 to 20
COL1 to 5
I
11 to 15
ROW1 to 5
O
is depressed or released, key scanning is started and is continued until
keyscan stop mode is selected. When keyscan stop mode is selected, all
outputs of ROW1 to 5 go back to low level.
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FEDL9222-02
¡ Semiconductor
ML9222
Pin
40
Symbol
DIM OUT
Type
O
Dimming pulse output.
Description
Connect this pin to the slave side DIM IN pin.
Synchronous signal input.
Connect these pins to the SYNC IN1 and SYNC IN2 pins
of a slave side.
RC oscillator connecting pins.
Connect a resistor (R2) between the V
CC
and OSC0 pins,
V
CC
R
2
C
3
C
2
38, 39
SYNC OUT 1, 2
O
31
OSC0
I/O
and a capacitor (C2) between the OSC0 pin and the GND, OSC0
and a capacitor (C3) between the V
CC
and the GND. C
3
is for V
CC
stabilization.
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