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PDF LC75844 Data sheet ( Hoja de datos )
| Número de pieza | LC75844 | |
| Descripción | 1/4 Duty General-Purpose LCD Driver | |
| Fabricantes | Sanyo Semicon Device | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LC75844 (archivo pdf) en la parte inferior de esta página. Total 14 Páginas | ||
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Ordering number : ENN6235
CMOS IC
LC75844M
1/4 Duty General-Purpose LCD Driver
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 VLCD for the LCD driver block (VLCD 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
[LC75844M]
36 19
1 18 0.15
15.3
0.35 0.8 0.85
SANYO: MFP36S
• 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.
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.
SANYO Electric Co.,Ltd. Semiconductor Company
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
92299TH (OT) No. 6235-1/14
1 page  
LC75844M
Pin Functions
Pin
S1/P1 to
S4/P4
S5 to S22
COM1
COM2
COM3
COM4
OSC
CE
CL
DI
INH
VLCD1
VLCD2
VDD
VLCD
VSS
Pin No.
1 to 4
5 to 22
23
24
25
26
Function
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.
Common driver outputs.
The frame frequency fO is given by: fO = (fOSC/512) Hz.
32 Oscillator connection
An oscillator circuit is formed by connecting an external resistor and capacitor to this pin.
34
35
36
Serial data transfer inputs. These pins are
connected to the control microprocessor.
CE: Chip enable
CL: Synchronization clock
DI: Transfer data
Display off control input
•INH = low (VSS): Off
S1/P1 to S4/P4 = Low
(These pins are forcibly set to the segment output port function and
33
fixed at the VSS level.)
S5 to S22 = Low (VSS),
COM1 to COM4 = Low (VSS)
•INH = high (VDD): On
Note that serial data transfers can be performed when the
display is forced off by this pin.
Used to apply the LCD drive 2/3 bias voltage externally. This pin must be connected to
29 VLCD2 when 1/2 bias drive is used.
Used to apply the LCD drive 1/3 bias voltage externally. This pin must be connected to
30 VLCD1 when 1/2 bias drive is used.
27 Logic block power supply. Provide a voltage in the range 2.7 to 6.0 V.
28 LCD driver block power supply. Provide a voltage in the range 2.7 to 6.0 V.
31 Ground pin. Connect to ground.
Active
I/O
Handling
when unused
—O
Open
—O
Open
— I/O
H
I
—
VDD
GND
LI
GND
—I
—I
——
——
——
Open
Open
—
—
—
Serial Data Transfer Format
1. When CL is stopped at the low level
CE
CL
DI 0 0 1 0 0 0 1 0 D1 D2 D3
B0 B1 B2 B3 A0 A1 A2 A3
CCB address
8 bits
D37 D38 D39 D40 D41 D42 D43 D44 0 0 0 0 0 P0 P1 P2 DR SC BU 0
Display data
44 bits
Control data
11 bits
DD
1 bit
0 0 1 0 0 0 1 0 D45 D46 D47
B0 B1 B2 B3 A0 A1 A2 A3
CCB address
8 bits
Note: DD ... Direction data
D81 D82 D83 D84 D85 D86 D87 D88 0 0 0 0 0 0 0 0 0 0 0 1
Display data
44 bits
Fixed data
11 bits
DD
1 bit
A12600
No. 6235-5/14
5 Page 
LC75844M
The INH pin and Display Control
Since the IC internal data (the display data and the control data) is undefined when power is first applied, applications
should set the INH pin low at the same time as power is applied to turn off the display (This sets the S1/P1 to S4/P4, S5
to S22, and COM1 to COM4 to the VSS level.) and during this period send serial data from the controller. The controller
should then set the INH pin high after the data transfer has completed. This procedure prevents meaningless displays at
power on. (See Figure 3.)
Notes on the Power On/Off Sequences
Applications should observe the following sequence when turning the LC75844M power on and off.
• At power on: Logic block power supply (VDD) on → LCD driver block power supply (VLCD) on
• At power off: LCD driver block power supply (VLCD) off → Logic block power supply (VDD) off
However, if the logic and LCD driver block use a shared power supply, then the power supplies can be turned on and off
at the same time.
Internal data
D1 to D44
P0 to P2
DR, SC, BU
Display and control data transfer
Undefined
Defined
Internal data (D45 to D88)
Undefined
Defined
Undefined
Undefined
Note: t1 ≥ 0
t2 > 0
t3 ≥ 0 (t2 > t3)
tc ... 10 µs min
Figure 3
Notes on Controller Transfer of Display Data
Since the LC75844M accept display data (D1 to D88) divided into two separate transfer operations, we recommend that
applications transfer all of the display data within a period of less than 30 ms to prevent observable degradation of
display quality.
No. 6235-11/14
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet LC75844.PDF ] | |
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