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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.
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Applications
VCRs
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Block diagram
SEGMENT Driver
S1
S11 V
EE
latch
K1
K4
4bit
data
L4
L1
SW4
SW1
GRID Driver
G1
G6
CONTROL
LOGIC
OSC
16bit latch
16bit · 11word
Display DATA RAM
CS SCK SI SO OSC V
DD
V
SS
S / G Driver
G11 / S12
G7 / S16
8bit shift - REG.
LED
Driver
(4 · 6)
KEY DATA
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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.