GENERAL DESCRIPTION
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.

FEATURES
• Logic power supply (VDD) : 3.3 V±10% or 5.0 V±10%
• VFD tube drive power supply (VSEG, VCOM ) : 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 (VSEG = 60 V)
        All the driver outputs are high : –350 mA (VSEG = 60 V)
    • Segment driver (ADA, ADB) : –15 mA (VSEG = 60 V)
    • Grid driver (COM1 to 24) : –25 mA (VCOM = 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)