Ordering number : EN4966A
CMOS LSI
LC75842E
General-Purpose 1/2 Duty LCD Display Driver
Overview
The LC75842E is a 1/2 duty general-purpose LCD display
driver for applications such as microprocessor-controlled
electronic tuning. It can drive up to 54 segments directly.
Package Dimensions
unit: mm
3162B-QFP36
[LC75842E]
Features
• 1/2 duty, 1/2 bias drive of up to 54 segments
• Serial data input supports CCB* format communication
with the system controller.
• Backup function which is based on a power saving
mode and all segments off functions that are controlled
by serial data.
• High generality, since display data is displayed directly
without decoder intervention.
• The display can be forced to the off state with the INH
pin.
• RC oscillator circuit
• CCB is a trademark of SANYO ELECTRIC CO., LTD.
• CCB is SANYO’s original bus format and all the bus
addresses are controlled by SANYO.
SANYO: QFP36
Specifications
Absolute Maximum Ratings
at Ta = 25°C, V
SS
= 0 V
Parameter
Maximum supply voltage
Input voltage
Output voltage
Output current
Allowable power dissipation
Operating temperature
Storage temperature
Symbol
V
DD
max
V
IN
1
V
IN
2
V
OUT
I
OUT
1
I
OUT
2
Pd max
Topr
Tstg
V
DD
CE, CL, DI, INH
OSC
OSC, S1 to S27, COM1, COM2
S1 to S27
COM1, COM2
Ta = 85°C
Conditions
Ratings
–0.3 to +6.5
–0.3 to +6.5
–0.3 to V
DD
+ 0.3
–0.3 to V
DD
+ 0.3
100
1
100
–40 to +85
–55 to +125
Unit
V
V
V
V
µA
mA
mW
°C
°C
Allowable Operating Ranges
at Ta = –40 to +85°C, V
SS
= 0 V
Parameter
Supply voltage
Input high level voltage
Input low level voltage
Recommended external resistance
Recommended external capacitance
Guaranteed oscillator range
Symbol
V
DD
V
IH
V
IL
R
OSC
C
OSC
f
OSC
V
DD
*
CE, CL, DI, INH
CE, CL, DI, INH
OSC
OSC
OSC
25
Conditions
Ratings
min
4.0
0.8 V
DD
0
68
680
50
100
typ
5.0
max
6.0
6.0
0.2 V
DD
Unit
V
V
V
kΩ
pF
kHz
Note:
*
Please contact your Sanyo sales representative if you need to operate the LC75842E at a power supply voltage V
DD
of 3.0 V (min.).
Continued on next page.
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN
41096HA (OT)/61595HA (OT) No. 4966-1/9
LC75842E
Continued from preceding page.
Parameter
Low level clock pulse width
High level clock pulse width
Data setup time
Data hold time
CE wait time
CE setup time
CE hold time
INH switching time
Symbol
t
øL
t
øH
t
ds
t
dh
t
cp
t
cs
t
ch
t
c
CL: Figure 1
CL: Figure 1
CL, DI: Figure 1
CL, DI: Figure 1
CE, CL: Figure 1
CE, CL: Figure 1
CE, CL: Figure 1
INH, CE: Figure 3
Conditions
Ratings
min
160
160
160
160
160
160
160
10
typ
max
Unit
ns
ns
ns
ns
ns
ns
ns
µs
Electrical Characteristics
in the Allowable Operating Ranges
Parameter
Hysteresis voltage
Input high level current
Input low level current
Output high level voltage
Symbol
V
H
I
IH
I
IL
V
OH
1
V
OH
2
V
OL
1
V
OL
2
V
MID
1
V
MID
2
f
OSC
I
DD
1
I
DD
2
Conditions
CE, CL, DI, INH: V
DD
= 5.0 V
CE, CL, DI, INH: V
I
= 6.0 V
CE, CL, DI, INH: V
I
= 0 V
S1 to S27: I
O
= –10 µA
COM1, COM2: I
O
= –100 µA
S1 to S27: I
O
= 10 µA
COM1, COM2: I
O
= 100 µA
COM1, COM2: V
DD
= 6.0 V, I
O
= ±100 µA
COM1, COM2: V
DD
= 4.0 V, I
O
= ±100 µA
OSC: R
OSC
= 68 kΩ, C
OSC
= 680 pF
Power saving mode
V
DD
= 6.0 V, output open, f
OSC
= 50 kHz
1.2
2.4
1.4
40
3.0
2.0
50
–5.0
V
DD
– 1.0
V
DD
– 0.6
1.0
0.6
3.6
2.6
60
5
2.0
Ratings
min
typ
0.4
5.0
max
Unit
V
µA
µA
V
V
V
V
V
V
kHz
µA
mA
Output low level voltage
Output middle level voltage
Oscillator frequency
Current drain
1. When CL is stopped at the low level
2. When CL is stopped at the high level
Figure 1
No. 4966-2/9
LC75842E
Pin Assignment
Block Diagram
Pin Functions
Pin
S1 to S27
COM1
COM2
OSC
Pin No.
1 to 27
36
35
28
Function
Segment outputs for displaying the display data transferred by serial data input.
Common driver outputs. The frame frequency f
O
is f
OSC
/512 Hz.
Oscillator connection. An oscillator circuit is formed by connecting an external
resistor and capacitor at this pin.
Serial data transfer inputs. Must be connected to the control microprocessor.
CE: Chip enable
CL: Synchronization clock
DI: Transfer data
Display off control input
INH = low (V
SS
) .....Display off (S1 to S27, COM1 and COM2 = low)
INH
30
INH = high (V
DD
)....Display on
However, serial data transfer is possible when the display is forced off by this
pin.
V
DD
V
SS
29
31
Power supply. Provide a power supply voltage of between 4.0 and 6.0 V.
Power supply. Connect this pin to ground.
—
—
—
—
—
—
L
I
GND
Active
—
—
I/O
O
O
Handling when
unused
Open
Open
—
I/O
V
DD
CE
CL
DI
32
33
34
H
I
—
GND
No. 4966-3/9
LC75842E
Serial Data Transfer Format
1. When CL is stopped at the low level
No. 4966-4/9
LC75842E
2. When CL is stopped at the high level
Figure 2
• CCB address......44
H
• D1 to D54..........Display data
Dn (n = 1 to 54) = 1: Segment on
Dn (n = 1 to 54) = 0: Segment off
• BU .....................Control data for specifying normal mode or power saving mode
• SC......................Control data for specifying all segments on or off
Serial Data Transfer Example
When 29 or more segments are used all 80 bits of the serial data must be sent.
When fewer than 29 segments are used only the first 40 bits of the serial data can be sent. However, all 80 bits must be
sent after power is first applied.
Note: The following type of transfer cannot be used when fewer than 29 segments are used.
No. 4966-5/9
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