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PDF BU9728AKV Data sheet ( Hoja de datos )
| Número de pieza | BU9728AKV | |
| Descripción | LCD driver for segment-type LCDs | |
| Fabricantes | ROHM Semiconductor | |
| Logotipo |  |
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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.
•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
Power supply voltage 1
Power supply voltage 2
Power dissipation
VDD
VLCD
Pd
– 0.3 ~ + 7.0
– 0.3 ~ + VDD
400∗
Operating temperature
Topr
– 20 ~ + 75
Storage temperature
Tstg
– 55 ~ + 125
∗ Reduced by 4.0mW for each increase in Ta of 1°C over 25°C .
Unit
V
V
mW
°C
°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
1 page  
Standard ICs
•Timing charts
CS
SCK
SD
C/D
tWL2
tSU2
tCYC
tWH1
tWL1
tSU1
tTLH
tH1
tTHL
tSCH
tSU3
Fig.1 Interface timing
SCK
tCYC
BU9728AKV
tWH2
tH2
tCCH
tH3
tWAIT
SD D7 D6
D0 D7
Fig.2 Command cycle
•Data format
Serial data is 4-line data transmitted in synchronization with the clock. Serial data with a bit length of 8 bits is input in
synchronization with SCK. If C / D is HIGH at the rising edge of the 8 × nth SCK clock pulse, the serial data is recog-
nized as command data, and if C / D is LOW, the serial data is recognized as display data. Serial data is input in
sequential order, starting from the MSB.
5
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet BU9728AKV.PDF ] | |
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