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)