GENERAL DESCRIPTION

The MSM9223 is a full CMOS controller/driver for Duplex or Triplex vacuum fluorescent display tube. It conststs of 27-segment driver outputs and 3-grid pre-driver outputs, so that it can drive directly up to 81-segment VFD.

MSM9223 features a digital dimming function, a 6-ch ADC, a 5x5 keyscan circuit and an encoder type switch interface.

MSM9223 provides an interface with a microcontroller only by three signal lines: DATA I/O, CLOCK and CS.

FEATURES

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

• Duplex/Triplex selectable

• Applicable VFD tube : 2 Grids x 27 Anodes VFD tube

: 3 Grids x 27 Anodes VFD tube

• 27-segment driver outputs : IOH=–5mA at VOH=VDD–0.8V (SEG1 to 19)

IOH=–10mA at VOH=VDD–0.8V (SEG20 to 27)

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

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

• Built-in 6-ch A/D converter

• Built-in 5 x 5 keyscan circuit

• Interface circuit for an encoder type rotary switch

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

• Built-in Power-On-Reset circuit

• Package:

64-pin plastic QFP (QFP64-P-1420-1.00-BK) Product name: MSM9223GS-BK