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ML9227

27-Bit Duplex/Triplex VFD Controller/Driver with Digital Dimming, ADC and Key scan

Oki Electric Industry 

OKI Semiconductor

FEDL9227-01

Issue Date:Dec., 18, 2002

ML9227

27-Bit Duplex/Triplex VFD Controller/Driver with Digital Dimming, ADC and Key scan

GENERAL DESCRIPTION

The ML9227 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.

ML9227 features a digital dimming function, a 6-ch ADC, a 5 × 5 key scan circuit and an encoder type switch

interface.

ML9227 provides an interface with a microcontroller only by three signal lines: DATA I/O, CLOCK, CS.

FEATURES

• Supply voltage (VDISP)

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

• Duplex/Triplex selectable

• Applicable VFD tube

: 2 Grids × 27 Anodes VFD tube

: 3 Grids × 27 Anodes VFD tube

• 27-segment driver outputs

: IOH = –5 mA at VOH = VDISP–0.8 V (SEG1 to 19)

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

IOL = 500 uA at VOL = 2.0 V (SEG1 to 27)

• 3-grid pre-driver outputs

: IOH = –5 mA at VOH = VDISP–0.8 V

IOL = 10 mA at VOL = 2.0 V

• 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: ML9227GA

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