BU9718KV Datasheet, PDF (3/10 Pages) Rohm – Picture cell driver for STN LCD driver for low voltage power supplies

Standard ICs
BU9718KV
•^{Pin descriptions}
Pin No. Pin name
1—11
13—23
26—35
S1—S11
S12—S22
S23—S32
36
COM1
37
COM2
38
COM3
39
RES
44
OSC
45
CS
46
CK
47
DI
41
VDD1
42
VDD2
I/O
Function
O ^{Segment data output pin; outputs LCD drive voltage that}
matches COM1 - COM3 compatible data
O Common drive output; frame freq. fC = (fOSC / 384) Hz
I
Reset input; when RES = L, resets internal data
(include. control data)
— Oscillation pin (for common, segment alternation waves)
I Chip segment input; when CS = H, data can be transferred
I Synchronous clock input for serial data transfer
I Serial data input
— ^{Internal standard voltage for liquid-crystal drive; when using}
1 / 2 bias mode, connects to VDD2
— ^{Internal standard voltage for liquid-crystal drive; when using}
1 / 2 bias mode, connects to VDD1
Processing when not in use
OPEN
VSS
VDD
VSS
VSS
VSS
VSS
OPEN
OPEN
• ^{Electrical characteristics (unless otherwise noted, Ta = 25°C, VDD = 2.7V to 3.5V, VSS = 0V)}
Parameter
Symbol Min.
Typ. Max.
Unit
Conditions
Input high level voltage
VIH
0.8 VDD
—
VDD
V
—
Input low level voltage
VIL
0
—
0.2 VDD
V
—
Input high level current
IIH
0
—
6.0
µA
VI = VDD
Input low level current
IIL
0
—
6.0
µA
VI = VSS
Output high level voltage
VSOH
— VDD – 1.0 —
V
IO = – 20µA
VCOH
— VDD – 1.0 —
V
IO = – 100µA
Output low level voltage
Output medium level voltage
Power supply current
VSOL
VCOL
VCM1
VSM1
VCM2
VSM2
VCM3
IQ
IDD
—
1.0
—
—
1.0
—
—
1 / 2 VDD
± 1.0
—
—
2 / 3 VDD
—
± 1.0
—
2 / 3 VDD
± 1.0
—
—
1 / 3 VDD
—
± 1.0
—
1 / 3 VDD
± 1.0
—
—
0.1
30
—
100
300
V
IO = 20µA
V
IO = 100µA
V
1 / 2bias
V
1 / 3bias
V
1 / 3bias
V
1 / 3bias
V
1 / 3bias
µA Low-power mode
µA
fOSC = 38kHz
Pin
CS, CK, DI, RES
CS, CK, DI, RES
CS, CK, DI, RES
CS, CK, DI, RES
S1 ~ S32
COM1 ~ COM3
S1 ~ S32
COM1 ~ COM3
COM1 ~ COM3
S1 ~ S32
COM1 ~ COM3
S1 ~ S32
COM1 ~ COM3
—
—
3