Ordering number : ENN6235
92299TH (OT) No. 6235-1/14
Overview
The LC75844M is a 1/4 duty general-purpose LCD driver
that can be used for frequency display in electronic tuners
under the control of a microcontroller. The LC75844M
can drive an LCD with up to 88 segments directly. The
LC75844M can also control up to 4 general-purpose
output ports. Since the LC75844M uses separate power
supply systems for the LCD drive block and the logic
block, the LCD driver block power-supply voltage can be
set to any voltage in the range 2.7 to 6.0 volts, regardless
of the logic block power-supply voltage.
Features
Support for 1/4 duty 1/2 bias or 1/4 duty 1/3 bias drive
of up to 88 segments under serial data control.
Serial data input supports CCB format communication
with the system controller.
Serial data control of the power-saving mode based
backup function and all the segments forced off function
Serial data control of switching between the segment
output port and the general-purpose output port
functions
High generality, since display data is displayed directly
without decoder intervention.
Independent V
LCD
for the LCD driver block (V
LCD
can
be set to any voltage in the range 2.7 to 6.0 volts,
regardless of the logic block power-supply voltage.)
The INH pin can force the display to the off state.
RC oscillator circuit
Package Dimensions
unit: mm
3204-MFP36S
0.15
15.3
1
18
36
19
0.85
0.35
0.8
2.5max
2.15
0.1
7.9
9.2
10.5
0.65
SANYO: MFP36S
[LC75844M]
LC75844M
SANYO Electric Co.,Ltd. Semiconductor Company
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
1/4 Duty General-Purpose LCD Driver
CMOS IC
Any and all SANYO products described or contained herein do not have specifications that can handle
applications that require extremely high levels of reliability, such as life-support systems, aircraft's
control systems, or other applications whose failure can be reasonably expected to result in serious
physical and/or material damage. Consult with your SANYO representative nearest you before using
any SANYO products described or contained herein in such applications.
SANYO assumes no responsibility for equipment failures that result from using products at values that
exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other
parameters) listed in products specifications of any and all SANYO products described or contained
herein.
CCB is a trademark of SANYO ELECTRIC CO., LTD.
CCB is a SANYO's original bus format and all the
bus addresses are controlled by SANYO.
Pin Assignment
No. 6235-2/14
LC75844M
P1/S1
P2/S2
DI
P3/S3
CL
P4/S4
CE
S5
INH
S6
OSC
S7
V
SS
S8
V
LCD
2
S9
V
LCD
1
V
LCD
S10
V
DD
S11
COM4
S12
COM3
S13
COM2
S14
COM1
S15
S22
S16
S21
S17
S20
S18
S19
LC75844M
A12595
Specifications
Absolute Maximum Ratings
at Ta = 25C, V
SS
= 0 V
Parameter
Symbol
Conditions
Ratings
Unit
Maximum supply voltage
V
DD
max
V
DD
0.3 to +7.0
V
V
LCD
max
V
LCD
0.3 to +7.0
V
V
IN
1
CE, CL, DI, INH
0.3 to +7.0
V
Input voltage
V
IN
2
OSC
0.3 to V
DD
+ 0.3
V
V
IN
3
V
LCD
1, V
LCD
2
0.3 to V
LCD
+ 0.3
V
Output voltage
V
OUT
1
OSC
0.3 to V
DD
+ 0.3
V
V
OUT
2
S1 to S22, COM1 to COM4, P1 to P4
0.3 to V
LCD
+ 0.3
V
I
OUT
1
S1 to S22
300
A
Output current
I
OUT
2
COM1 to COM4
3
mA
I
OUT
3
P1 to P4
5
mA
Allowable power dissipation
Pd max
Ta = 85C
100
mW
Operating temperature
Topr
40 to +85
C
Storage temperature
Tstg
55 to +125
C
Allowable Operating Ranges
at Ta = 40 to +85C, V
SS
= 0 V
Parameter
Symbol
Conditions
Ratings
Unit
min
typ
max
Supply voltage
V
DD
V
DD
2.7
6.0
V
V
LCD
V
LCD
2.7
6.0
V
Input voltage
V
LCD
1
V
LCD
1
2/3 V
LCD
V
LCD
V
V
LCD
2
V
LCD
2
1/3 V
LCD
V
LCD
V
Input high level voltage
V
IH
CE, CL, DI, INH
0.8 V
DD
6.0
V
Input low level voltage
V
IL
CE, CL, DI, INH
0
0.2 V
DD
V
Recommended external resistance
R
OSC
OSC
43
k
Recommended external capacitance
C
OSC
OSC
680
pF
Guaranteed oscillation range
f
OSC
OSC
25
50
100
kHz
Data setup time
t
ds
CL, DI: Figure 2
160
ns
Data hold time
t
dh
CL, DI: Figure 2
160
ns
CE wait time
t
cp
CE, CL: Figure 2
160
ns
CE setup time
t
cs
CE, CL: Figure 2
160
ns
CE hold time
t
ch
CE, CL: Figure 2
160
ns
High level clock pulse width
t
H
CL: Figure 2
160
ns
Low level clock pulse width
t
L
CL: Figure 2
160
ns
Rise time
t
r
CE, CL, DI: Figure 2
160
ns
Fall time
t
f
CE, CL, DI: Figure 2
160
ns
INH switching time
t
c
INH, CE: Figure 3
10
s
Top view
No. 6235-3/14
LC75844M
Parameter
Symbol
Conditions
Ratings
Unit
min
typ
max
Hysteresis
V
H
CE, CL, DI, INH
0.1 V
DD
V
Input high level current
I
IH
CE, CL, DI, INH; V
I
= 6.0 V
5.0
A
Input low level current
I
IL
CE, CL, DI, INH; V
I
= 0 V
5.0
A
V
OH
1
S1 to S22; I
O
= 20 A
V
LCD
0.9
V
Output high level voltage
V
OH
2
COM1 to COM4; I
O
= 100 A
V
LCD
0.9
V
V
OH
3
P1 to P4; I
O
= 1 mA
V
LCD
0.9
V
V
OL
1
S1 to S22; I
O
= 20 A
0.9
V
Output low level voltage
V
OL
2
COM1 to COM4; I
O
= 100 A
0.9
V
V
OL
3
P1 to P4; I
O
= 1 mA
0.9
V
V
MID
1
COM1 to COM4; 1/2 bias,
1/2 V
LCD
0.9
1/2 V
LCD
+ 0.9
V
I
O
= 100 A
V
MID
2
S1 to S22; 1/3 bias,
2/3 V
LCD
0.9
2/3 V
LCD
+ 0.9
V
I
O
= 20 A
Output middle level voltage
*
1
V
MID
3
S1 to S22; 1/3 bias,
1/3 V
LCD
0.9
1/3 V
LCD
+ 0.9
V
I
O
= 20 A
V
MID
4
COM1 to COM4; 1/3 bias,
2/3 V
LCD
0.9
2/3 V
LCD
+ 0.9
V
I
O
= 100 A
V
MID
5
COM1 to COM4; 1/3 bias,
1/3 V
LCD
0.9
1/3 V
LCD
+ 0.9
V
I
O
= 100 A
Oscillator frequency
f
OSC
OSC; R
OSC
= 43 k
, C
OSC
= 680 pF
40
50
60
kHz
I
DD
1
V
DD
; power saving mode
5
A
I
DD
2
V
DD
; V
DD
= 6.0 V, output open, fosc = 50 k Hz
230
460
A
I
LCD
1
V
LCD
; power saving mode
5
A
Current drain
I
LCD
2
V
LCD
; V
LCD
= 6.0 V, output open
100
200
A
1/2 bias, fosc = 50 k Hz
I
LCD
3
V
LCD
; V
LCD
= 6.0 V, output open
60
120
A
1/3 bias, fosc = 50 k Hz
Electrical Characteristics
for the Allowable Operating Ranges
Note:
*
1 Excluding the bias voltage generation divider resistors built in the V
LCD
1 and V
LCD
2. (See Figure 1.)
VLCD1
VLCD2
VLCD
VSS
A06588
To the common segments driver
Except these resistors
s
Figure 1
Pin Functions
No. 6235-5/14
LC75844M
CE: Chip enable
CL:
Synchronization clock
DI:
Transfer data
H
--
S1/P1 to
S4/P4
S5 to S22
Pin
1 to 4
5 to 22
--
O
Open
Segment outputs for displaying the display data transferred by serial data input. The pins
S1/P1 to S4/P4 can be used as general-purpose output ports when so set up by the
control data.
COM1
COM2
COM3
COM4
23
24
25
26
--
O
Open
Common driver outputs.
The frame frequency f
O
is given by: f
O
= (f
OSC
/512) Hz.
OSC
32
CE
CL
DI
34
35
36
Serial data transfer inputs. These pins are
connected to the control microprocessor.
--
I/O
V
DD
I
GND
Oscillator connection
An oscillator circuit is formed by connecting an external resistor and capacitor to this pin.
V
LCD
1
29
--
I
Open
Used to apply the LCD drive 2/3 bias voltage externally. This pin must be connected to
V
LCD
2 when 1/2 bias drive is used.
V
LCD
2
30
--
I
Open
Used to apply the LCD drive 1/3 bias voltage externally. This pin must be connected to
V
LCD
1 when 1/2 bias drive is used.
V
DD
27
--
--
--
Logic block power supply. Provide a voltage in the range 2.7 to 6.0 V.
V
LCD
28
--
--
--
LCD driver block power supply. Provide a voltage in the range 2.7 to 6.0 V.
V
SS
31
--
--
--
Ground pin. Connect to ground.
INH
33
L
I
GND
Display off control input
INH = low (V
SS
):
Off
S1/P1 to S4/P4 = Low
(These pins are forcibly set to the segment output port function and
fixed at the V
SS
level.)
S5 to S22 = Low (V
SS
),
COM1 to COM4 = Low (V
SS
)
INH = high (V
DD
): On
Note that serial data transfers can be performed when the
display is forced off by this pin.
Active
I/O
Handling
when unused
Function
Pin No.
Serial Data Transfer Format
1. When CL is stopped at the low level
Note: DD ... Direction data
CE
CL
DI
A12600
0
0
1
0
0
0
1
0
B0 B1 B2 B3 A0 A1 A2 A3
D1
D2 D3
D37 D38 D39 D40 D41 D42 D43 D44 0
0
0
0
0
P0 P1 P2 DR SC BU
0
0
0
1
0
0
0
1
0
B0 B1 B2 B3 A0 A1 A2 A3
D45 D46 D47
D81 D82 D83 D84 D85 D86 D87 D88 0
0
0
0
0
0
0
0
0
0
0
1
CCB address
8 bits
CCB address
8 bits
Display data
44 bits
Display data
44 bits
Control data
11 bits
Fixed data
11 bits
DD
1 bit
DD
1 bit
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