OKI Semiconductor
ML9212
GENERAL DESCRIPTION
FEDL9212-01
Issue Date: Nov., 26, 2002
32-Bit Duplex/Triplex (1/2 duty / 1/3 duty) VF Controller/Driver with Digital Dimming
The ML9212 is a full CMOS controller/driver for Duplex or Triplex (1/2 duty or 1/3 duty) vacuum fluorescent
display tube. It consists of a 32-segment driver multiplexed to drive up to 96 segments, and 10-bit digital dimming
circuit.
ML9212 features a selection of a master mode and a slave mode, and therefore it can be used to expand segments
for the VFD driver with keyscan and A/D converter function.
ML9212 provides an interface with a microcontroller only by three signal lines: DATA IN, CLOCK and CS.
FEATURES
: 4.5 to 5.5 V
•
Logic supply voltage (V
DD
)
: 8 to 18 V
•
Driver supply voltage (V
DISP
)
•
Duplex/Triplex (1/2 duty / 1/3 duty) selectable
DUP/TRI = 1/2 duty selectable at “H” level
DUP/TRI = 1/3 duty selectable at “L” level
•
Number of display segments
Max. 64-segment display (during 1/2 duty mode)
Max. 96-segment display (during 1/3 duty mode)
•
Master/Slave selectable
M/S = Master mode selectable at “H” level
M/S = Slave mode selectable at “L” level
•
Interface with a microcontroller
Three lines: CS, CLOCK, and DATA IN
•
32-segment driver outputs
: I
OH
= –5 mA at V
OH
= V
DISP
–0.8 V (SEG1 to 22)
(can be directly connected to VFD tube : I
OH
= –10 mA at V
OH
= V
DISP
–0.8V (SEG23 to 32)
and require no external resisters)
: I
OL
= 500
µA
at V
OL
= 2 V (SEG1 to 32)
•
3-grid pre-driver outputs
: I
OH
= –5.0 mA at V
OH
= V
DISP
–0.8 V
(require external drivers)
I
OL
= 10 mA at V
OL
= 2 V
•
Logic outputs
: I
OH
= –200
µA
at V
OH
= V
DD
–0.8 V
I
OL
= 200
µA
at V
OL
= 0.8 V
•
Built-in digital dimming circuit (10-bit resolution)
•
Built-in oscillation circuit (external R and C)
•
Built-in Power-On-Reset circuit
•
Package options:
56-pin plastic QFP (QFP56-P-910-0.65-2K)(ML9212GA)
1/17
OKI [ OKI ELECTRONIC COMPONETS ]
