GENERAL DESCRIPTION

The MSC1230 is a Bi-CMOS display driver with digital dimming function. It enables switching between 1/3-duty vacuum fluorescent (VF) display tube and universal VF display tube by pin control.

The MSC1230 consists of a 112-bit shift register, a 111-bit latch, a 10-bit digital dimming circuit, 37 segment drivers, and 3 grid drivers.

FEATURES

• Power supply voltage : VDD=8 V to 18 V (built-in 5 V regulator for logic circuit)

• Operating temperature range : Ta=–40 °C to +85 °C

• 37-segment driver outputs : IOH=–6 mA at VOH = VDD –0.8 V

• 3-grid driver outputs : IOH=–30 mA at VOH = VDD –0.8 V

• Built-in digital dimming circuit (10-bit resolution)

• Switchable between 1/3-duty VF display tube and universal VF display tube*

When SEL pin is left open : Selects universal VF display tube (The grids GRID1, GRID2, and GRID1+GRID2 are turned on repeatedly in this order)

When SEL pin is used at 0 V : Selects 1/3-duty VF display tube (The grids GRID1, GRID2, and GRID3 are turned on repeatedly in this order)

• Built-in oscillation circuit (external R and C)

• Built-in Power-On-Reset circuit

• Package:

56-pin plastic QFP (QFP56-P-910-0.65-2K)(Product name: MSC1230GS-2K)