Standard ICs
FL tube driver
BU2872AK
The BU2872AK is a driver IC for the FL display unit. It has a total of 22 high withstanding voltage output pins, and
supports displays ranging from 11-segment 11-character displays to 16-segment 4-character displays. A key scan
function, LED drive output, and a general-purpose input pin make this IC ideal for use in the front panels of VTRs
and other equipment. A serial interface enables control of all functions through a microcomputer.
•
Applications
VCRs
•
Features
1) High withstanding voltage output.
2) Display modes: 11S
×
11G ~16S
×
4G
3) Variable display luminance (7 steps).
4) 3-wire serial interface.
5) Key scanning function (6
×
4).
6) Internal pull-down resistance (high withstanding volt-
age output).
7) QFP 44-pin package.
•
Block diagram
OSC
SCK
V
DD
G1
GRID
Driver
16bit
×
11word
K4
KEY DATA
latch
(4
×
6)
K1
Display DATA RAM
L4
LED
Driver
8bit shift - REG.
V
SS
16bit latch
SO
CS
SI
OSC
L1
CONTROL
LOGIC
SW4
4bit
data
SW1
G6
SEGMENT Driver
S / G Driver
G11 / S12
G7 / S16
S11
S1
V
EE
1
ROHM [ ROHM ]
