Semiconductor
ML9473
1/3, 1/4, 1/5 Duty 60 Output LCD Driver
FEDL9473-01
Issue Date: Aug. 21, 2008
GENERAL DESCRIPTION
The ML9473 is a LCD driver for dynamic display providing 3-duty-switchable pins (1/3, 1/4, 1/5 duty). It can
directly drive LCDs of up to 300, 240 and 180 segments when 1/5, 1/4 and 1/3 duty are selected respectively.
FEATURES
• Operating range
Supply voltage
: 3.0 to 5.5 V
Operating temperature range
:
40
to + 105C
• Segment output
: 60 pins
1/5 duty
: Up to 300 segments can be displayed.
1/4 duty
: Up to 240 segments can be displayed.
1/3 duty
: Up to 180 segments can be displayed.
• Serial transfer clock frequency
: 4 MHz
• Serical interface with CPU
:Through three input pins (DATA_IN, LOAD, and CLOCK)
• Built-in oscillator circuit for COMMON signals
• One-to-one correspondence between input data and output data
When input data is at “H” level
: Display goes on.
When input data is at “L” level
: Display goes off.
• The entire display can be turned off. (BLANK pin)
• Package options
80-pin plastic TQFP (TQFP80-P-1212-0.50-K) (Product name: ML9473TB)
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FEDL9473-01
LAPIS Semiconductor
ML9473
BLOCK DIAGRAM
SEG1
SEG60
BLANK
60-Dot Segment Driver
60-Ch Data Selector
60
60
60
60
60
60-Bit
Latch 5
60-Bit
Latch 4
60-Bit
Latch 3
60-Bit
Latch 2
60-Bit
Latch 1
LOAD
Latch
Selector
60
DATA_IN
CLOCK
68-Stage Shift Register
OSC_OUT
OSC_OUT
OSC_IN
OSC
Timing Generator
V
LC1
V
LC2
V
LC3
DSEL1
DSEL2
Common
Driver
COM1
COM2
COM3
COM4
COM5
V
DD
GND
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FEDL9473-01
LAPIS Semiconductor
ML9473
PIN CONFIGURATION (TOP VIEW)
SEG25
SEG24
SEG22
62
SEG36
SEG26
SEG37
SEG35
SEG34
SEG32
SEG31
SEG28
SEG40
SEG39
SEG38
SEG33
SEG30
80
79
78
77
76
75
74
73
72
71
70
69
SEG29
68
67
SEG27
66
65
64
63
SEG23
SEG41
SEG42
SEG43
SEG44
SEG45
SEG46
SEG47
SEG48
SEG49
SEG50
SEG51
SEG52
SEG53
SEG54
SEG55
SEG56
SEG57
SEG58
SEG59
SEG60
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
61
SEG21
60
59
58
57
56
55
54
53
52
51
50
49
48
47
46
45
44
43
42
41
SEG20
SEG19
SEG18
SEG17
SEG16
SEG15
SEG14
SEG13
SEG12
SEG11
SEG10
SEG9
SEG8
SEG7
SEG6
SEG5
SEG4
SEG3
SEG2
SEG1
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
COM2
OSC_OUT
V
LC1
COM4
COM3
DATA_IN
OSC_OUT
OSC_IN
DSEL2
CLOCK
BLANK
80-Pin Plastic TQFP
DSEL1
COM5
COM1
NC
V
LC3
LOAD
GND
V
LC2
V
DD
40
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FEDL9473-01
LAPIS Semiconductor
ML9473
PIN DESCRIPTION
Symbol
OSC_IN
OSC_OUT
OSC_OUT
DATA_IN
CLOCK
LOAD
BLANK
Type
I
O
O
I
I
I
Description
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 a “H” level, and it
goes off when input data is at a “L” level.
Shift clock input pin. Data from the DATA_IN pin is transferred in synchronization
with the rising edge of the shift clock.
Load signal input pin. Serially input data is transferred to the 60-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
Duty selected
L
L
1/3
L
H
1/4
H
X
1/5
X: Don’t care
Display output pins for LCD. These pins are connected to the COMMON side of
the LCD panel.
Display output pins for LCD. Theses pins are connected to the SEGMENT side of
the LCD panel. For the correspondence between the output of these pins and
input data, see the “Data Structure” Section.
Bias pins for LCD driver. 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
=GND
Supply voltage pin and ground pin.
l
DSEL1
DSEL2
I
I
COM1 to
COM5
SEG1 to
SEG60
V
LC1
, V
LC2,
V
LC3
V
DD
, GND
O
O
—
—
Note: Built-in schmitt circuit is used for all input pins.
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FEDL9473-01
LAPIS Semiconductor
ML9473
ABSOLUTE MAXIMUM RATINGS
Parameter
Supply Voltage
Input Voltage
Storage Temperature
Power Dissipation
Output Current
Symbol
V
DD
V
I
T
STG
P
D
I
O
Condition
Ta = 25°C
Ta = 25°C
—
Ta < 105°C
—
Rating
–0.3 to 6.5
–0.3 to V
DD
+0.3
–55 to 150
650
–2.0 to 2.0
Unit
V
V
°C
mW
mA
RECOMMENDED OPERATING CONDITIONS
Parameter
Supply Voltage
CLOCK Frequency
Operating Temperature
Symbol
V
DD
f
CP
Ta
Condition
V
LC3
= GND
—
—
Range
3.0 to 5.5
0.75 to 4
–40 to 105
Unit
V
MHz
°C
Oscillator Circuit
Parameter
Oscillator Resistance
Oscillator Capacitance
Current Limiting Resistance
Symbol
R
0
C
0
R
1
Applicable pin
OSC_OUT
OSC_OUT
OSC_IN
Condition
—
—
—
Min.
20
0.00047
62
25
Max.
120
0.01
360
250
Unit
k
F
k
Hz
Common Signal Frequency
f
COM
COM1 to COM5
—
Note: See Section, “Reference Data”, for the resistor and capacitor values in the table.
RC Values in Oscillator Circuit
Parameter
Oscillator Resistance
Oscillator Capacitance
Current Limiting Resistance
Symbol
R
0
C
0
R
1
Applicable pin
OSC_OUT
OSC_OUT
OSC_IN
1/3 duty
68
0.001
220
1/4 duty
51
0.001
160
1/5 duty
43
0.001
130
Unit
k
F
k
Example of an oscillator circuit:
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