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PDF BU9718KV Data sheet ( Hoja de datos )
| Número de pieza | BU9718KV | |
| Descripción | Picture cell driver for STN LCD driver for low voltage power supplies | |
| Fabricantes | ROHM Semiconductor | |
| Logotipo |  |
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Standard ICs
Picture cell driver for STN (LCD driver)
for low voltage power supplies
BU9718KV
The BU9718KV is a driver IC designed for the character-type STN liquid crystal panels which are ideal for applica-
tions such as portable devices. The number of display segments includes 32 output segments and 3 common out-
puts, enabling drive of up to 96 segments. A compact 48-pin QFP package with a pitch of 0.5 mm is used, enabling
compact size for the set as a whole.
•Applications
Portable terminals (POS, ECR, PDA, and others),
held telephone units), and others Low-voltage power
movie projectors, cameras, telephones (cordless hand-
supply sets
•Features
1) Operates on 3V power supply.
4) Up to 32 segment output pins and 3 common output
2) Low current dissipation. (0.1µA in low power mode
pins are provided, enabling a total display of up to
(actual value))
3) Compact package. (molded section is 7.0 mmٗ)
96 segments.
5) 1 / 3 duty display.
6) Either 1 / 2 or 1 / 3 bias can be selected for power sup-
•Absolute maximum ratings (Ta = 25°C, VSS = 0V)
ply for LCD display.
Parameter
Power supply voltage∗1
Input voltage∗1
Output voltage∗1
Symbol
Pin
VDD
VDD
VIN OSC, CS, CK, DI, RES
VOUT
OSC
Limits
– 0.3 ~ + 7.0
– 0.3 ~ VDD + 0.3
– 0.3 ~ VDD + 0.3
Unit
V
V
V
Output current
Power dissipation
ISO S1 ~ S32
ICO COM1 ~ COM3
Pd —
300
3
400 ∗2
µA
mA
mW
Storage temperature
Tstg
—
∗1 Max. voltage that can be applied with a VSS pin
∗2 Reduced by 4.0mW for each increase in Ta 1°C over 25°C.
•Recommended operating conditions (Ta = 25°C, VSS = 0V)
– 55 ~ + 125
°C
Parameter
Power supply voltage∗
Symbol
Pin
Min. Typ. Max. Unit
VDD VDD 2.7 — 3.5 V
Input voltage∗
VDD1
VDD2
VDD1
VDD2
0
2 / 3 VDD
VDD
0
1 / 3 VDD
VDD
V
V
Oscillation freq., with
external input
fOSC OSC
—
38 100 kHz
External resistance
R OSC — 47 — kΩ
External capacitance
C OSC — 1000 —
pF
Operating temperature
Topr
— – 40
—
85
°C
∗ Indicates the max. voltage that can be applied with a VSS pin.
1
1 page  
Standard ICs
Timing charts
(1) When CK is stopped at “L”
CS
CK
D1 D2 D3
DI
Display data
BU9718KV
D95 0 0 0 0 0
Fig.3
Control code
BM LC OE
When CS is HIGH, data can be transferred. Data is sent to the shift register at the rising edge of CK. After all of the
DI data has been transferred, CS should be set to LOW. The voltage corresponding to the display data transferred at
the falling edge of CS is output.
(2) When CK is stopped at “H”
CS
CK
D1 D2 D3
D96 0 0 0 0 0 BM LC OE
DI
Display data
Control code
Fig.4
Control code table
OE Output enable control
0 Normal operation
1 No display; all display data = 0 (internal oscillation circuit is operating)
LC Low-power mode control
0 Normal operation
1 Low-power mode = internal oscillation circuit has stopped; segment and common output = 0
BM Bias mode control
0 1 / 3 bias
1 1 / 2 bias
5
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| PDF Descargar | [ Datasheet BU9718KV.PDF ] | |
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