MSM9223

E2C0044-19-96 ¡ Semiconductor ¡ Semiconductor MSM9223 GENERAL DESCRIPTION This version: Sep. 1999 MSM9223 Previous version: Aug. 1999 27-Bit Duplex/Triplex VFD Controller/Driver with Digital Dimming, ADC and Keyscan 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 5 ¥ 5 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) Duplex/Triplex selectable Applicable VFD tube : 8 to 18.5V (Built-in 5V regulator for logic) : 2 Grids ¥ 27 Anodes VFD tube : 3 Grids ¥ 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 ¥ 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 1/24 ¡ Semiconductor MSM9223 BLOCK DIAGRAM SEG1 SEG27 GRID1 GRID2 GRID3 D-GND VDD VCC (5V) VREG (5V) L-GND 5V Regulator & Power On Reset 0...