1/13
Semiconductor
MSM6775
GENERAL DESCRIPTION
The MSM6775 is an LCD driver for dynamic display providing 3-duty-switchable pins (1/3, 1/
4 and 1/5 duty). It can directly drive LCDs of up to 400, 320 and 240 segments when 1/5, 1/4
and 1/3 duty are selected, respectively.
FEATURES
Operating range
Supply voltage (V
DD
)
: 2.7 to 5.5V
Operating temperature (T
op
)
: 40 to +85
C
LCD driving voltage (V
DD
-V
LC3
)
: 3.5 to 5.5V
Segment output
: 80 pins
1/5 duty
: Up to 400 segments can be displayed.
1/4 duty
: Up to 320 segments can be displayed.
1/3 duty
: Up to 240 segments can be displayed.
Serial transfer clock frequency
: 4MHz
Serial interface with CPU
: Through three input pins (DATA, LOAD, and
CLOCK)
One-to-one corresponcence between input data and its output
When input data is at "H" level
: Display goes on.
When input data is at "L" level
: Display goes off.
Built-in oscillator circuit for COMMON signals
The entire display can be turned off. (BLANK pin)
Package:
100-pin plastic TQFP (TQFP100-P-1414-0.50-K) (Product name : MSM6775TS-K)
Semiconductor
MSM6775
1/3, 1/4, 1/5 DUTY LCD DRIVER WITH 5-DOT COMMON DRIVER AND 80-DOT
SEGMENT DRIVER
E2B0012-27-Y2
This version: Nov. 1997
Previous version: Mar. 1996
2/13
Semiconductor
MSM6775
BLOCK DIAGRAM
BLANK
80-DOT SEGMENT DRIVER
80-CH DATA SELECTOR
80-BIT
LATCH 5
80-BIT
LATCH 4
80-BIT
LATCH 3
80-BIT
LATCH 2
80-BIT
LATCH 1
LATCH
SELECTOR
88-BIT SHIFT REGISTER
80
TIMING
GENERATOR
OSC
COMMON
DRIVER
LOAD
DATA
CLOCK
OSCR
OSCC
OSCIN
DSEL1
DSEL2
V
DD
V
SS
V
LC1
V
LC2
V
LC3
COM1
COM2
COM3
COM4
COM5
SEG1
SEG80
3/13
Semiconductor
MSM6775
PIN CONFIGURATION (TOP VIEW)
75
1
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
50
49
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
COM1
COM2
COM3
COM4
COM5
V
LC1
V
LC2
V
LC3
V
SS
OSC-IN
OSC-C
OSC-R
DSEL1
DSEL2
BLANK
DATA
CLOCK
LOAD
V
DD
NC
SEG80
SEG79
SEG78
SEG77
SEG76
SEG26
SEG27
SEG28
SEG29
SEG30
SEG31
SEG32
SEG33
SEG34
SEG35
SEG36
SEG37
SEG38
SEG39
SEG40
SEG41
SEG42
SEG43
SEG44
SEG45
SEG46
SEG47
SEG48
SEG49
SEG50
SEG51
74 SEG24
73 SEG23
72 SEG22
71 SEG21
70 SEG20
69 SEG19
68 SEG18
67 SEG17
66 SEG16
65 SEG15
64 SEG14
63 SEG13
62 SEG12
61 SEG11
60 SEG10
59 SEG9
58 SEG8
57 SEG7
56 SEG6
55 SEG5
54 SEG4
53 SEG3
52 SEG2
51 SEG1
2
SEG52
3
SEG53
4
SEG54
5
SEG55
6
SEG56
7
SEG57
8
SEG58
9
SEG59
10
SEG60
11
SEG61
12
SEG62
13
SEG63
14
SEG64
15
SEG65
16
SEG66
17
SEG67
18
SEG68
19
SEG69
20
SEG70
21
SEG71
22
SEG72
23
SEG73
24
SEG74
25
SEG75
SEG25
NC : No connection
100-Pin Plastic TQFP
4/13
Semiconductor
MSM6775
PIN DESCRIPTIONS
Symbol
Type
OSC-IN
I
OSC-C
O
OSC-R
O
DATA
I
CLOCK
I
LOAD
I
BLANK
I
COM5
COM1 to
SEG80
SEG1 to
V
LC2
--
V
LC1
V
DD
V
LC3
V
SS
O
O
--
DSEL1
I
DSEL2
I
Pins for oscillation. The oscillator circuit is configured by externally connecting two
resistors and a capacitor. Make the wiring length as short as possible, because the
resistor connected to the OSC-IN pin has a higher value and the circuit is susceptible
to external noise.
Serial data input pin. The display goes on when input data is at "H" level, and it goes
off when input data is at "L" level.
Shift clock input pin. Data from the DATA pin is transferred in synchronization with the
rising edge of the shift clock. (Built-in Schmitt circuit is used.)
Load signal input pin. Serially input data is transferred to the 80-bit latch at "H" level
of this load signal, then held at "L" level.
Input pin that turns off all segments. The entire display goes off when "L" level is
applied to this pin. The display returns to the previous state when "H" level is applied.
Input pins to select 1/3, 1/4, or 1/5 duty. Following shows how each duty is selected.
DSEL2
DSEL1
L
L
L
H
H
X
Duty selected
1/3
1/4
1/5
X: Don't care
Display output pins for LCD. These pins are connected to the COMMON side on the
LCD panel.
Display output pins for LCD. These pins are connected to the SEGMENT side on the
LCD panel. For the correspondence between the output of these pins and input data,
see Section, "Data Structure".
Bias pins for LCD drive. Through these pins, bias voltages for the LCD
are externally supplied. The bias potential must meet the following condition:
V
DD
>V
LC1
V
LC2
>V
LC3
Supply voltage pin and ground pin.
Description
5/13
Semiconductor
MSM6775
ABSOLUTE MAXIMUM RATINGS
Parameter
Supply Voltage
Input Voltage
Storage Temperature
Symbol
Condition
Rating
Unit
V
DD
V
I
T
STG
Ta=25C
Ta=25C
--
0.3 to +6.0
0.3 to V
DD
+0.3
55 to +150
V
V
C
RECOMMENDED OPERATING CONDITIONS
Oscillator Circuit
Note: See Section, "Reference Data," for the resistor and capacitor values in the table.
RC Values in Oscillator Circuit
Parameter
Supply Voltage
LCD Driving Voltage
Operating Temperature
Symbol
Condition
Range
Applicable pin
V
DD
V
DD
V
LC3
T
op
--
--
--
2.7 to 5.5
3.5 to 5.5
40 to +85
V
DD
V
DD
, V
LC1
, V
LC2
, V
LC3
--
Unit
V
V
C
Parameter
Oscillation Resistance
Oscillation Capacitance
Current Limiting Resistance
COMMON Signal Frequency
Symbol
Condition
Min
Max
Applicable pin
R
0
C
0
R
1
f
COM
--
--
--
--
20
0.00047
62
25
120
0.01
360
250
OSC-R
OSC-C
OSC-IN
COM1 to
Unit
kW
mF
kW
Hz
COM5
Parameter
Oscillation Resistance
Oscillation Capacitance
Current Limiting Resistance
Symbol
1/3 duty
1/4 duty 1/5 duty
Applicable pin
R
0
C
0
R
1
68
0.001
220
51
0.001
160
43
0.001
130
OSC-R
OSC-C
OSC-IN
Unit
kW
mF
kW
Example of an oscillator circuit
R
0
C
0
R
1
OSC-R
OSC-C
OSC-IN
MSM6775
6/13
Semiconductor
MSM6775
ELECTRICAL CHARACTERISTICS
DC Characteristics
*1 Applies to the CLOCK and OSC-IN.
*2 Applies to all input pins excluding the CLOCK and OSC-IN.
*3 Applies to all input pins.
*4 Applies to COM1 to COM5.
*5 Applies to SEG1 to SEG80.
*6 V
LC1
=3.0V
*7 V
LC2
=2.0V
*8 V
LC3
=1.0V
*9 R
0
=51kW R
1
=160kW C
0
=0.001mF
Parameter
"H" Input Voltage 1
"L" Input Voltage 1
"H" Input Voltage 2
Symbol
Condition
Min
Max
V
IH1
V
IL1
V
IH2
0.8V
DD
0.15V
DD
Unit
V
V
V
"L" Input Voltage 2
V
IL2
V
"H" Input Current
V
IH
V
DD
=5.5V, V
I
=V
DD
mA
"L" Input Current
V
IL
V
DD
=5.5V, V
I
=0V
mA
COMMON
Output Voltage
V
OC0
I
O
=100mA
V
DD
1
V
V
OC1
I
O
=100mA
V
LC1
1
V
V
OC2
I
O
=100mA
V
LC2
+1
V
Segment
Output Voltage
V
OC3
I
O
=+100mA
V
LC3
+1
V
V
OS0
I
O
=10mA
V
DD
1
V
V
OS1
I
O
=10mA
V
LC1
1
V
V
OS2
I
O
=10mA
V
LC2
+1
V
(V
DD
=2.7 to 5.5V, Ta=40 to +85C)
Supply Current
*1
*1
*2
*2
*3
*3
*6
*7
*8
*6
*7
*8
*9
V
DD
=4.0V
*4
V
DD
=4.0V
*5
V
DD
=5.0V, no load
I
O
=+10mA
0.85V
DD
V
LC2
1
V
LC2
1
0.2V
DD
10
10
V
LC1
+1
V
LC1
+1
V
LC3
1
0.5
V
mA
V
OS3
I
DD
V
DD
V
DD
V
SS
V
SS
--
--
--
--
--
--
--
7/13
Semiconductor
MSM6775
AC Characteristics
t
WLO
V
IH2
V
IL2
V
IH2
V
IL2
t
DH
t
r1
V
IL1
V
IL1
t
WLC
t
WHC
t
f1
V
IL1
V
IH1
V
IH1
V
IL1
V
IL2
V
IL2
V
IH2
V
IH2
t
LC
t
WHL
t
CL
1/f
CP
V
IL1
V
IL1
V
IL1
V
IH1
V
IH1
1/f
OSC
t
r2
t
f2
t
WHO
DATA
CLOCK
LOAD
OSC-IN
(V
IH1
=0.85V
DD
V
IL1
=0.15V
DD
)
(V
IH2
=0.8V
DD
V
IL2
=0.2V
DD
)
t
DS
Parameter
Clock Frequency
Clock "H" Time
Clock "L" Time
Symbol
Condition
Min
Max
Applicable pin
f
CP
t
WHC
t
WLC
--
--
--
70
70
4.0
CLOCK
Unit
MH
Z
ns
ns
Data Set-up Time
t
DS
--
50
DATA
ns
Data Hold Time
t
DH
--
50
CLOCK
ns
Load "H" Time
t
WHL
--
100
LOAD
ns
Clock-to-load Time
t
CL
--
100
CLOCK
ns
Load-to-clock Time
t
LC
--
100
LOAD
ns
Rise time, Fall Time
t
r1
, t
f1
--
50
CLOCK
ns
OSC-IN Input Frequency
f
OSC
--
20
kH
Z
OSC-IN "H" Time
t
WHO
--
20
OSC-IN
ms
OSC-IN "L" Time
t
WLO
--
20
ms
Rise Time, Fall Time
t
r2
, t
f2
100
ns
(V
DD
=2.7 to 5.5V, Ta=40 to +85C)
--
--
--
--
--
--
--
--
--
--
--
--
--
--
8/13
Semiconductor
MSM6775
FUNCTIONAL DESCRIPTION
Operation
As shown in "Data Structure" (next section), the display data consists of the data field
corresponding to the output for turning the segments on or off and the select field that selects
the input block of data. Data input to the DATA pin is loaded into the 88-bit shift register at the
rising edge of the CLOCK signal, transferred to the 80-bit latch while the load signal is at "H"
level, and then output via the 80-dot segment driver.
New data
D
1
D
80
DM1 DM2
DM3
C
1
C
2
C
3
C
4
C
5
1
80
81
82
83
84
85
86
87
88
Old data
DATA
CLOCK
LOAD
Data in
display latch
9/13
Semiconductor
MSM6775
Data Structure
Input data
Correspondence between select bits and COM1 to COM5
Notes: 1. Arbitrary data can be set for the dummy bits.
2. Select bits C
1
to C
5
select 80-bit latches that correspond to COM1 to COM5,
respectively. Therefore, if "1" is set for more than one select bit, data is set to all the
corresponding 80-bit latches.
Example:
If "1" is set to all the select bits C
1
to C
5
, the display data of D
1
to D
80
is set to all the
80-bit latches that correspond to COM1 to COM5.
C
5
End bit
C
4
C
3
C
2
C
1
DM3 DM2 DM1
D
80
D
79
D
5
D
4
D
3
D
2
D
1
Corresponds to SEG1
First bit
Corresponds to SEG80
Select bit
(5 bits)
Dummy bit
(3 bits)
LCD display data
(80 bits)
C
5
C
4
C
3
C
2
C
1
0
0
0
0
1
0
0
0
1
0
0
0
1
0
0
0
1
0
0
0
1
0
0
0
0
Description
Display data corresponding to COM1
Display data corresponding to COM2
Display data corresponding to COM3
Display data corresponding to COM4
Display data corresponding to COM5
10/13
Semiconductor
MSM6775
APPLICATION CIRCUITS
(For 1/4 duty)
DATA
CLOCK
LOAD
BLANK
V
DD
+5V
CPU
P
O
R
T
R
1
C
0
R
0
OSC-IN
OSC-C
OSC-R
DSEL1
DSEL2
V
SS
V
LC1
V
LC2
V
LC3
BIAS CIRCUIT
1/4 DUTY
320-SEGMENT
LCD PANEL
SEG1
SEG80
MSM6775
COM1
COM2
COM3
COM4
COM5
Open
11/13
Semiconductor
MSM6775
REFERENCE DATA
The data shown in this section is for reference (a metal film resistor and a film capacitor are
used). Resistor and capacitor values must be determined based on experiments.
Use the following expression to convert oscillation frequency to COMMON frame frequency (or
vice versa):
f
COM
=f
OSC
Duty/16
f
COM
: COMMON frame frequency
f
OSC
: Oscillation frequency
Duty : e.g., 1/4 for 1/4 duty
For example, if f
COM
=100Hz at 1/5 duty, the oscillation frequency is f
OSC
=8000Hz.
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
I
DD
[mA]
I
DD
vs. V
DD
Ta=25C
R
0
=51kW
R
1
=160kW
C
0
=0.001mF
1/4 duty
2
3
4
5
6
7
V
DD
[V]
80
120
Frame Frequency [Hz]
COMMON Frame Frequency vs. V
DD
(The resistor and capacitor values used are their recommended values.)
Ta=25C
1/3 duty
1/4 duty
1/5 duty
2
3
4
5
6
7
V
DD
[V]
110
100
90
12/13
Semiconductor
MSM6775
20
30
40
50
60
70
80 90
C
0
=0.00047mF
C
0
=0.001mF
C
0
=0.0022mF
C
0
=0.0047mF
100
R
1
3R
0
Ta=25C
Oscillation Frequency vs. R
0
(V
DD
=3V)
10
5
10
4
1000
100
Frequency [Hz]
R
0
[kW]
~
~
20
30
40
50
60
70
80 90
C
0
=0.00047mF
C
0
=0.001mF
C
0
=0.0022mF
C
0
=0.0047mF
100
R
1
3R
0
Ta=25C
Oscillation Frequency vs. R
0
(V
DD
=5V)
10
5
10
4
1000
100
Frequency [Hz]
R
0
[kW]
~
~
13/13
Semiconductor
MSM6775
(Unit : mm)
PACKAGE DIMENSIONS
Notes for Mounting the Surface Mount Type Package
The SOP, QFP, TSOP, SOJ, QFJ (PLCC), SHP and BGA are surface mount type packages, which
are very susceptible to heat in reflow mounting and humidity absorbed in storage.
Therefore, before you perform reflow mounting, contact Oki's responsible sales person for the
product name, package name, pin number, package code and desired mounting conditions
(reflow method, temperature and times).
TQFP100-P-1414-0.50-K
Package material
Lead frame material
Pin treatment
Solder plate thickness
Package weight (g)
Epoxy resin
42 alloy
Solder plating
5 mm or more
0.55 TYP.
Mirror finish
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