1
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
VDD – 0.3 ~ + 7.0 V
VLCD – 0.3 ~ + VDD V
Pd 400
*
mW
Tstg – 55 ~ + 125 °C
Topr – 20 ~ + 75 °C
Power supply voltage 1
Power supply voltage 2
Power dissipation
Operating temperature
Storage temperature
*
Reduced by 4.0mW for each increase in Ta of 1°C over 25°C .
•
Recommended operating conditions (Ta = 25°C, VSS = 0V)
Parameter
VDD 2.5 5.5 V— —
VLCD 0VDD V
The following relationship should
be maintained: VDD ^ V1 ^ V2 ^ V3 ^ VSS.
Rf = 470kW
—
fOSC — — kHz36
Symbol Min. Typ. Max. Unit Conditions
Power supply voltage 1
Power supply voltage 2
(VDD - V3)
Oscillation frequency