Semiconductor
ML9203-xx
1/30
Semiconductor
ML9203-xx
5
7 Dot Character 16-Digit 2-Line Display Controller/Driver with Character RAM
GENERAL DESCRIPTION
The ML9203-xx is a 5 7 dot matrix type vacuum fluorescent display tube controller driver IC
which displays characters, numerics and symbols of a maximum of 16 digits 2 lines.
Dot matrix vacuum fluorescent display tube drive signals are generated by serial data sent from
a micro-controller. A display system is easily realized by internal ROM and RAM for character
display.
The ML9203-xx has low power consumption since it is made by CMOS process technology.
-01 is available as a general-purpose code.
Custom codes are provided on customer's request.
FEATURES
Logic power supply (V
DD
)
: 3.3 V
10% or 5.0 V
10%
VFD tube drive power supply (V
DISP
)
: 20 to 60 V
VFD driver output current
(VFD driver output can be connected directly to the VFD tube. No pull-down resistor is
required.)
- Segment driver (SEGA1 to A35, SEGB1 to B35)
Only one driver output is high
: 5 mA (V
DISP
=60V)
All the driver outputs are high
: 350 mA (V
DISP
=60V)
- Segment driver (ADA, ADB)
: 20 mA (V
DISP
=60V)
- Grid driver (COM1 to 16)
: 50 mA (V
DISP
=60V)
Content of display
SEGA1 to SEGA35 and ADA
- CGROM_A 57 dots
: 240 types (character data)
- CGRAM_A 57 dots
: 16 types (character data)
- ADRAM_A 16 (display digit) 1 bit (symbol data; can be used for a cursor.)
- DCRAM_A 16 (display digit) 8 bits (register for character data display)
SEGB1 to SEGB35 and ADB
- CGROM_B 57 dots
: 240 types (character data)
- CGRAM_B 57 dots
: 16 types (character data)
- ADRAM_B 16 (display digit) 1 bit (symbol data; can be used for a cursor.)
- DCRAM_B 16 (display digit) 8 bits (register for character data display)
Display control function
- Display digit
: 1 to 16 digits
- Display duty (brightness adjustment)
: 0 to 1024 stages
- All lights ON/OFF
3 interfaces with microcontroller
: DA, CS, CP (4 interfaces when RESET is added)
Built-in oscillation circuit
Crystal oscillation or ceralock oscillation : 4.0 MHz (Typ)
Package options:
100-pin plastic QFP (QFP100-P-1420-0.65-BK) (Product name: ML9203-xxGA)
E2C0041-19-64
This version: Jun. 1999
Preliminary
Semiconductor
ML9203-xx
5/30
PIN DESCRIPTION
1 to 15,
81 to 100
Pin
Type Connects to
VFD tube anode electrode drive output.
Directly connected to fluorescent display tube and a pull-down
resistor is not necessary. I
OH
>5 mA
Description
Symbol
VFD tube
anode
electrode
SEGA1 to A35
O
VFD tube grid electrode drive output.
Directly connected to fluorescent display tube and a pull-down
resistor is not necessary. I
OH
>50 mA
VFD tube
grid
electrode
COM1 to 16
O
53 to 60
71 to 78
VFD tube anode electrode drive output.
Directly connected to fluorescent display tube and a pull-down
resistor is not necessary. I
OH
>20 mA
VFD tube
anode
electrode
ADA, ADB
O
52, 79
V
DD
69
L-GND
62
V
DISP
51, 80
--
Power
supply
V
DD
-L-GND are power supplies for internal logic.
V
DISP
-D-GND are power supplies for driving fluorescent tubes.
Apply V
DISP
after V
DD
is applied.
Use the same power supply for L-GND and D-GND.
Serial data input (positive logic).
Input from LSB.
Micro-
controller
DA
I
68
Shift clock input.
Serial data is shifted on the rising edge of CP.
Micro-
controller
CP
I
67
Chip select input.
Serial data transfer is disabled when CS pin is "H" level.
Micro-
controller
CS
I
66
Reset input.
"Low" initializes all the functions.
Initial status is as follows.
Address of each RAM
Data of each RAM
Display digit
Brightness adjusment
All lights ON or OFF
For a circuit when R and C are connected externally,
see Application Circuit.
address "00"H
Content is undefined
16 digits
0/1024
OFF mode
RESET
I
65
Micro-
controller
or
C, R
Pins for oscillation.
Connect crystal and capacitors or ceralock resonator and
capacitors. (Use a built-in feedback resistor.)
Set the target oscillation frequency to 4 MHz.
For an external circuit, see APPLICATION CIRCUIT.
OSC0
I
63
OSC1
O
64
Crystal or
ceralock
resonator
16 to 50
SEGB1 to B35
D-GND
61, 70
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