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ML9226

32-Bit Duplex/Triplex VFD Controller/Driver with Digital Dimming, ADC and Keyscan

Oki Electric Industry 

OKI Semiconductor

FEDL9226-01

Issue Date: Dec. 11, 2002

ML9226

32-Bit Duplex/Triplex VFD Controller/Driver with Digital Dimming, ADC and Keyscan

GENERAL DESCRIPTION

The ML9226 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.

ML9226 features a digital dimming function, a 8-ch ADC, a 5 × 5 keyscan circuit and an encoder type switch

interface.

ML9226 provides an interface with a microcontroller only by four signal lines: DATA I/O, CLOCK, CS.

FEATURES

• Supply voltage (VDISP)

: 8 to 18.5V (Built-in 5V regulator for logic)

• Duplex/Triplex selectable

• Applicable VFD tube

: 2 Grids × 32 Anodes VFD tube

: 3 Grids × 32 Anodes VFD tube

• 32-segment driver outputs

: IOH = –5 mA at VOH = VDISP – 0.8 V (SEG1 to 22)

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

IOL = 500 uA at VOL = 2.0 V (SEG1 to 32)

• 3-grid pre-driver outputs

: IOH = – 5.0 mA at VOH = VDISP – 0.8V

IOL = 10 mA at VOL = 2.0V

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

• Built-in 8-ch A/D converter

• Built-in 5 × 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) ( ML9226GA)

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