OKI Semiconductor
ML9227
GENERAL DESCRIPTION
FEDL9227-01
Issue Date:Dec., 18, 2002
27-Bit Duplex/Triplex VFD Controller/Driver with Digital Dimming, ADC and Key scan
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 (V
DISP
)
•
Duplex/Triplex selectable
•
Applicable VFD tube
: 8 to 18.5 V (Built-in 5 V regulator for logic)
: 2 Grids
×
27 Anodes VFD tube
: 3 Grids
×
27 Anodes VFD tube
•
27-segment driver outputs
: I
OH
= –5 mA at V
OH
= V
DISP
–0.8 V (SEG1 to 19)
I
OH
= –10 mA at V
OH
= V
DISP
–0.8 V (SEG20 to 27)
I
OL
= 500 uA at V
OL
= 2.0 V (SEG1 to 27)
•
3-grid pre-driver outputs
: I
OH
= –5 mA at V
OH
= V
DISP
–0.8 V
I
OL
= 10 mA at V
OL
= 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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