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INF8577N
LCD CONTROL IC WITH I2C 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 I2C bus interface;
can be used as expander of I2C bus
output
40
T amb= -10 to +70 °С
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.
PS3120
S31
S30
S29
S28
S27
S26
S25
S24
S23
S22
S21
S20
S19
S18
S17
S16
S15
S14
S13
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
40 SDA
39 SCL
38 Vs
37 A0/OS
36 A1
35 VDD
34 A2/BP
33 BP1
32 S1
31 S2
30 S3
29 S4
28 S5
27 S6
26 S7
25 S8
24 S9
23 S10
22 S11
21 S12
Figure 2 - Pinout
Operation temperature range
Operation temperature range from minus 40 to plus 85 °С.
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INF8577N
Table 1 - Absolute maximum and maximum conditions
Parameter, unit
Supply voltage, V
Input voltage, V
Constant component of LCD
driver, mV
Consumption current, mA
Input current, mA
Output current, mA
Reset forming voltage when
switching on the supply, V
Low input voltage on output
A0/OSC, V
High input voltage on output
A0/OSC, V
Low input voltage on output A1,
V
High input voltage on output A1,
V
Low input voltage on output
A2/BP2, V
High input voltage on output
A2/BP2, V
Low input voltage on outputs
SCL, SDA, V
High input voltage on outputs
SCL, SDA, V
Symbol
VDD
V1
VBP
IDD,ISS
II
IO
VPOR
VIL1
VIH1
VIL2
VIH2
VIL3
VIH3
VIL4
VIH4
Maximum ratings
min
2.5
0
-20
max
6.0
VDD
20
Absolute
maximum ratings
min max
-0.5 8.0
-0.5 VDD+0.5
- 0.125
--
--
- 2.0
0 0.05
VDD-0.5
0
VDD
0.3 VDD
-50
-20
-25
-
-
-
-
50
20
25
-
-
-
-
0.7 VDD
0
VDD
0.10
VDD-
0.10
0
0.7 VDD
VDD
0.3 VDD
6.0
-
-
-
-
-
-
-
-
-
-
Clock signal frequency, kHz
fSCL
- 100 -
-
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INF8577N
Table 2 - Electrical parameters (Таmb = from minus 40 to plus 85°С )
n current
Parameter
Symbol
Test conditions
IDD1 6.0 V, fSCL=100 kHz,
ROSC=1 MOhm, СOSC=680 pF
Value
min max
- 125
Unit
uA
IDD2 VDD= 2.5 to 6.0 V, fSCL=0 kHz, -
ROSC=1 MOhm, СOSC=680 pF
IDD3 VDD=5 V, fSCL=0 kHz, (direct -
control mode)
75
20
A0/OSC=VDD , at Таmb =25°С
IDD4 VDD=5 V, fSCL=0 kHz,
-
ROSC=1 MOhm, СOSC=680 pF
at Таmb =25°С
40
Low output voltage
tput SDA
VOL VDD=5 V, IOL=3.0 mA
- 0.4
Leakage current on input - on
VDD= 2.5 to 6.0 V,
outputs A1, SCL, SDA
IL1 VSS =0V, VI=VDD or VSS
-1 1
Leakage current on input
A2/BP2,BP1
Input current
- on outputе A2/BP2
Leakage current on input
- on output A0/OSC
Oscillator initial current
Low output voltage
- on outputs S1-S32
High output voltage
- on outputs S1-S32
Output current on outputs of LCD
lines control - on outputs
ВР1,A2/ВР2
Low output voltage
- on outputs BP1, A2/BP2
High output voltage
- on outputs BP1, A2/BP2
Mean level output voltage
- on outputs BP1, A2/BP2
Frequency of signals on
control outputs
LCD
IL2
IPD
IL3
IOSC
VOL1
VOH1
Iload
VOL2
VOH2
VOL3
fLCD
VDD=2.5 to 6.0 V,
VSS =0V
VI=VDD or VSS
VDD= 2.5 to 6.0 V,
VI=VDD
VDD= 2.5 to 6.0 V,
VI=VDD
VDD= 2.5 to 6.0 V,
VSS =0V
VI=VSS
VDD=5 V,
IOL1=0.3 mA
VDD=5 V,
IOH1=-0.3 mA
V DD=5 V, VSS =0V
VO=VSS+0.5V or VDD-0.5V
(VSS+VDD)/2+0.5V
-5
-
-1
-
-
VDD-
0.8
-100
or
VDD=5 V,
IOL2=100 мкА
VDD=5 V,
IOH2=-100 mkA
VDD=5 V,
IOL3=100 mkA
ROSC=1 MOhm,
СOSC=680 pF
-
4.5
1.75
65
5
5
1
5
0.8
-
100
0.5
-
3.3
120
V
uA
uA
uA
uA
uA
V
V
uA
V
V
V
Hz
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Time diagrams
Sx
BP1,BP2
INF8577N
VDD=5V
0.5V
0.5V
tBS
0.5V
0.5V
tBS100 mks
Figure 3 - Time diagram of LCD driver operation
SDA
SCL
SD
tBU
tL
tHD;ST
tHD;DA
tr
tSU;
tf
tHI
tSU;DA
tSU;
tBUF4.7us, tLOW4.7us, tHIGH4.0us, tr1.0 mks, tf0.3us, tHD;STA4.0us,
tHD;DAT0ns, tSU;DAT250ns, tSU;STA4.0mks, tSU;STO4.0mks
Figure 4 - Time diagram of I2C bus operation
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Application circuits
INF8577N
LCD WITH DIRECT CONTROL
1 32 64
-
LINE
256
S
2
S
B
BP A
VV
A
V
SCL
SDA
A
V
SC
SD
O
S
S
BP1
BP2 A
V
A
AO
0S
V
S SC
SS
S
2
S
BP
1
BA
VD 2
A
A
0
OS
V
S SC
L
SS
S
S
3
A2A1A0=000
A2A1A0=001
A2A1A0=111
Eight ICs INF8577СN control 256 driver segments.
Figure 5 - LCD driver with direct control
5