INF8577N
1
LCD
CONTROL
IC
WITH
I
2
C
INTERFACE
Description
Functions:
Direct and duplex LCD control modes. IC
controls 32 LCD segments in direct mode
and 64 segments in duplex mode;
Ensures interface of I
2
C bus interface;
can be used as expander of I
2
C bus
output
40
T amb= -10 to +70
Figure 1 - Package type
Features:
Supply voltage 2.5 to 6V;
Low power consumption;
Embedded oscillator for LCD control
signals shaping;
Autoincremented data input;
Possibility to switch over display memory
banks in direct control mode;
Possibility for cascading IC to increase
number of controlled segment up to 256;
Blanking of display on supply reset.
39
1
2
3
4
5
40
6
8
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
P1 0
S32
S30
S29
S28
S27
S23
S31
9
7
S26
S25
S24
Vs
SDA
SCL
A0/OS
A1
V
DD
A2/BP
BP1
S22
S21
S20
S19
S18
S17
S16
S15
S14
S12
S13
S11
S10
S9
S8
S7
S6
S5
S4
S2
S3
S1
Figure 2 - Pinout
Operation temperature range
Operation temperature range from minus 40 to plus 85
.
INF8577N
2
Table 1 - Absolute maximum and maximum conditions
Maximum ratings
Absolute
maximum ratings
Parameter, unit
Symbol
min max min
max
Supply voltage, V
V
DD
2.5 6.0
-0.5
8.0
Input voltage, V
V
1
0
V
DD
-0.5
V
DD
+0.5
Constant component of LCD
driver, mV
V
BP
-20
20
Consumption current, mA
I
DD,
I
SS
-
0.125
-50
50
Input current, mA
I
I
-
-
-20
20
Output current, mA
I
O
- -
-25
25
Reset forming voltage when
switching on the supply, V
V
POR
- 2.0
- -
Low input voltage on output
A0/OSC, V
V
IL1
0
0.05
- -
High input voltage on output
A0/OSC, V
V
IH1
V
DD
-0.5
V
DD
- -
Low input voltage on output A1,
V
V
IL2
0
0.3
V
DD
-
-
High input voltage on output A1,
V
V
IH2
0.7
V
DD
V
DD
- -
Low input voltage on output
A2/BP2, V
V
IL3
0
0.10
- -
High input voltage on output
A2/BP2, V
V
IH3
V
DD
-
0.10
V
DD
- -
Low input voltage on outputs
SCL, SDA, V
V
IL4
0
0.3
V
DD
-
-
High input voltage on outputs
SCL, SDA, V
V
IH4
0.7
V
DD
6.0 - -
Clock signal frequency, kHz
f
SCL
-
100
- -
INF8577N
3
Table 2 - Electrical parameters (mb = from minus 40 to plus 85
)
Value
Parameter Symbol
Test
conditions
min max
Unit
I
DD1
6.0 V, f
SCL
=100 kHz,
R
OSC
=1 MOhm,
OSC
=680 pF
- 125
I
DD2
V
DD
= 2.5 to 6.0 V, f
SCL
=0 kHz,
R
OSC
=1 MOhm,
OSC
=680 pF
- 75
I
DD3
V
DD
=5 V, f
SCL
=0 kHz, (direct
control mode)
A0/OSC=V
DD
, at mb =25
- 20
n current
I
DD4
V
DD
=5 V, f
SCL
=0 kHz,
R
OSC
=1 MOhm,
OSC
=680 pF
at mb =25
- 40
uA
Low output voltage
tput SDA
V
OL
V
DD
=5 V, I
OL
=3.0 mA
-
0.4
V
Leakage current on input - on
outputs A1, SCL, SDA
I
L1
V
DD
= 2.5 to 6.0 V,
V
SS
=0V, V
I
=V
DD
or V
SS
-1
1
uA
Leakage current on input
A2/BP2,BP1
I
L2
V
DD
=2.5 to 6.0 V,
V
SS
=0V
V
I
=V
DD
or V
SS
-5
5
uA
Input current
- on output A2/BP2
I
PD
V
DD
= 2.5 to 6.0 V,
V
I
=V
DD
- 5 uA
Leakage current on input
- on output A0/OSC
I
L3
V
DD
= 2.5 to 6.0 V,
V
I
=V
DD
-1 1 uA
Oscillator initial current
I
OSC
V
DD
= 2.5 to 6.0 V,
V
SS
=0V
V
I
=V
SS
- 5 uA
Low output voltage
- on outputs S1-S32
V
OL1
V
DD
=5 V,
I
OL1
=0.3 mA
-
0.8
V
High output voltage
- on outputs S1-S32
V
OH1
V
DD
=5 V,
I
OH1
=-0.3 mA
V
DD
-
0.8
-
V
Output current on outputs of LCD
lines control - on outputs
1,A2/2
I
load
V
DD
=5 V, V
SS
=0V
V
O
=V
SS
+0.5V or V
DD
-0.5V or
(V
SS
+V
DD
)/2+0.5V
-100 100 uA
Low output voltage
- on outputs BP1, A2/BP2
V
OL2
V
DD
=5 V,
I
OL2
=100
-
0.5
V
High output voltage
- on outputs BP1, A2/BP2
V
OH2
V
DD
=5 V,
I
OH2
=-100 mkA
4.5
-
V
Mean level output voltage
- on outputs BP1, A2/BP2
V
OL3
V
DD
=5 V,
I
OL3
=100 mkA
1.75
3.3
V
Frequency of signals on LCD
control outputs
f
LCD
R
OSC
=1 MOhm,
OSC
=680 pF
65 120 Hz
INF8577N
4
Time diagrams
t
BS
100 mks
Figure 3 - Time diagram of LCD driver operation
t
BUF
4.7us, t
LOW
4.7us, t
HIGH
4.0us, t
r
1.0 mks, t
f
0.3us, t
HD;STA
4.0us,
t
HD;DAT
0ns, t
SU;DAT
250ns, t
SU;STA
4.0mks, t
SU;STO
4.0mks
Figure 4 - Time diagram of I
2
C bus operation
Sx
V
DD
=5V
0.5V
0.5V
0.5V
0.5V
BP1,BP2
t
BS
t
SU;
t
SU;
t
r
t
f
t
HI
t
SU;DA
t
HD;DA
t
HD;ST
t
L
t
BU
SCL
SDA
SD
INF8577N
5
Application circuits
Eight ICs INF8577N control 256 driver segments.
Figure 5
-
LCD driver with direct control
O
O
S
OS
V
A
0
SD
SCL
SC
V
BP
A
B
S
S
2
S
S
S
S
BP1
BP2
A
A
V
SC
S
S
S
S
S
2
BP
1
S
S
3
256
1 32 64
A2A1A0=000
V
A
A
V
A2A1A0=001
V
A
0
A2A1A0=111
B
V
D
A
SC
L
S
A
2
-
V
SDA
LINE
LCD WITH DIRECT CONTROL
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