BU9728AKV Datasheet, PDF (1/10 Pages) Rohm – LCD driver for segment-type LCDs

Standard ICs
LCD driver for segment-type LCDs
BU9728AKV
The BU9728AKV is a segment-type LCD system driver which can accommodate microcomputer control and a serial
interface. An internal 4-bit common output and LCD drive power supply circuit enable configuration of a display sys-
tem at low cost.
•^Applications
Movie projectors, car audio systems, telephones
•^Features
1) Serial interface. (8-bit length)
2) Display RAM: Internal, 128 bits. (up to 128 seg-
ments can be displayed)
3) Internal power supply circuit for LCD drive.
4) Display duty: 1 / 4
5) Can be driven with low voltage and low current dissi-
pation.
•^{Absolute maximum ratings (Ta = 25°C, VSS = 0V)}
Parameter
Symbol
Limits
Unit
Power supply voltage 1
VDD
– 0.3 ~ + 7.0
V
Power supply voltage 2
Power dissipation
VLCD
Pd
– 0.3 ~ + VDD
V
400^∗
mW
Operating temperature
Topr
– 20 ~ + 75
°C
Storage temperature
Tstg
– 55 ~ + 125
°C
∗ Reduced by 4.0mW for each increase in Ta of 1°C over 25°C .
•^{Recommended operating conditions (Ta = 25°C, VSS = 0V)}
Parameter
Symbol Min. Typ. Max.
Power supply voltage 1
VDD
2.5
—
5.5
Power supply voltage 2
(VDD - V3)
VLCD
0
—
VDD
Oscillation frequency
fOSC
—
36
—
Unit
Conditions
V
—
The following relationship should
V
be maintained: VDD м V1 м V2 м V3 м VSS.
kHz Rf = 470kΩ
1