OKI Semiconductor
ML9204-xx
GENERAL DESCRIPTION
PEDL9204-01
Issue Date:
Jan. 8, 2003
Preliminary
5
×
7 Dot Character
×
24-Digit
×
2-Line Display Controller/Driver with Character RAM (Built-in Key Scan)
The ML9204-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 24 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.
Built-in key scan for 3-channel encoder type rotary switch and 5
×
6 matrix key switch allow the user to receive
each switch input.
The ML9204-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
SEG
, V
COM
) : 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
SEG
= 60 V)
All the driver outputs are high
: –350 mA (V
SEG
= 60 V)
• Segment driver (ADA, ADB)
: –15 mA (V
SEG
= 60 V)
• Grid driver (COM1 to 24)
: –25 mA (V
COM
= 60 V)
•
Content of display
SEGA1 to SEGA35 and ADA
• CGROM_A
: 5
×
7 dots 240 types (character data)
• CGRAM_A
: 5
×
7 dots 16 types (character data)
• ADRAM_A
: 24 (display digit)× 1 bit (symbol data; can be used for a cursor.)
• DCRAM_A
: 24 (display digit)
×
8 bits (register for character data display)
SEGB1 to SEGB35 and ADB
• CGROM_B
: 5
×
7 dots 240 types (character data)
• CGRAM_B
: 5
×
7 dots 16 types (character data)
• ADRAM_B
: 24 (display digit)× 1 bit (symbol data; can be used for a cursor.)
• DCRAM_B
: 24 (display digit)
×
8 bits (register for character data display)
•
Display control function
• GCRAM
: Simultaneous output of COM1 to 24 can be set in 1 grid.
• Display digits
: 1 to 24 digits (9- to 24-bit arbitrary setting)
• Display duty (brightness adjustment)
: 0/1024 to 960/1024 stages
• All lights ON/OFF
•
5 interfaces with microcontroller:DI/O,
CS, CP, RESET,
INT
•
Built-in key scan circuit for 5
×
6 matrix key switch
•
Built-in key scan circuit for 3-channel encoder type rotary switch
•
Built-in oscillation circuit
Crystal oscillation or ceramic oscillation: 4.0 MHz (Typ)
•
Standby function
Inhibiting the oscillator circuit provides low power consumption.
•
Package options:
128-pin plastic QFP (QFP128-P-1420-0.50-K) (ML9204-xxGA)
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