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BU9728AKV Datasheet

  • BU9728AKV

  • LCD driver for segment-type LCDs

  • 10頁

  • ROHM

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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.
鈥?/div>
Applications car audio systems, telephones
Movie projectors,
鈥?/div>
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.
鈥?/div>
Absolute maximum ratings (Ta = 25擄C, V
Parameter
Power supply voltage 1
Power supply voltage 2
Power dissipation
Operating temperature
Storage temperature
SS
= 0V)
Limits
鈥?0.3 ~ + 7.0
鈥?0.3 ~ + V
DD
400
鈭?/div>
鈥?20 ~ + 75
鈥?55 ~ + 125
Unit
V
V
mW
擄C
擄C
Symbol
V
DD
V
LCD
Pd
Topr
Tstg
over 25擄C .
鈭?/div>
Reduced by 4.0mW for each increase in Ta of 1擄C
鈥?/div>
Recommended operating conditions (Ta = 25擄C, V
Parameter
Power supply voltage 1
Power supply voltage 2
(V
DD
- V
3
)
Oscillation frequency
SS
= 0V)
Max.
5.5
V
DD
鈥?/div>
Unit
V
V
kHz
Conditions
鈥?/div>
The following relationship should
be maintained: V
DD
V
1
V
2
V
3
R
f
= 470k鈩?/div>
V
SS
.
Symbol
V
DD
V
LCD
f
OSC
Min.
2.5
0
鈥?/div>
Typ.
鈥?/div>
鈥?/div>
36
1

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