GENERAL DESCRIPTION

The ML9222 is a full CMOS controller/driver for Duplex or Triplex vacuum fluorescent display tube. It conststs of 32-segment driver outputs and 3-grid pre-driver outputs, so that it can drive directly up to 96-segment VFD.

ML9222 features a digital dimming function, a 8-ch ADC, a 5 x 5 keyscan circuit and an encoder type switch interface.

ML9222 provides an interface with a microcontroller only by four signal lines: DATA I/O, CLOCK, CS and INT.

FEATURES

• Supply voltage (VDD) : 8 to 18.5V (Built-in 5V regulator for logic)

• Duplex/Triplex selectable

• Applicable VFD tube : 2 Grids x 32 Anodes VFD tube

                              : 3 Grids x 32 Anodes VFD tube

• 32-segment driver outputs : IOH=–5mA at VOH=VDD–0.8V (SEG1 to 22)

                                        IOH=–10mA at VOH=VDD–0.8V (SEG23 to 32)

• 3-grid pre-driver outputs : IOL=10mA at VOL=2V

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

• Built-in 8-ch A/D converter

• Built-in 5 x 5 keyscan circuit

• 3 interface circuits for an encoder type rotary switch

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

• Built-in Power-On-Reset circuit

• Package:

   80-pin plastic QFP (QFP80-P-1420-0.80-BK) Product name: ML9222GA