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PDF LC75874 Data sheet ( Hoja de datos )
| Número de pieza | LC75874 | |
| Descripción | 1/4-Duty General-Purpose LCD Display Driver | |
| Fabricantes | Sanyo Semicon Device | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LC75874 (archivo pdf) en la parte inferior de esta página. Total 16 Páginas | ||
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Ordering number : EN5800
CMOS LSI
LC75874E, 75874W
1/4-Duty General-Purpose LCD Display Driver
Overview
The LC75874E and LC75874W are 1/4-duty general-
purpose microprocessor-controlled LCD driver that can be
used in applications such as frequency display in products
with electronic tuning. In addition to being able to drive
up to 264 segments directly, the LC75874E and
LC75874W can also control up to 8 general-purpose
output ports.
Since the LC75874E and LC75874W use 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 V, 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
techniques under serial data control (up to
264 segments)
• Serial data input supports CCB format communication
with the system controller.
• Serial data control of the power-saving mode based
backup function and the all segments forced off
function.
• Serial data control of switching between the segment
output port and general-purpose output port functions.
• High generality, since display data is displayed directly
without the intervention of a decoder circuit.
• Independent VLCD for the LCD driver block (VLCD can
be set to any voltage in the range 2.7 to 6.0 V,
regardless of the logic block power-supply voltage.)
• The INH pin allows the display to be forced to the off
state.
• RC oscillator circuit
Package Dimensions
unit: mm
3174-QFP80E
[LC75874E]
unit: mm
3220-SQFP80
[LC75874W]
SANYO: QFP80E
SANYO: SQFP80
• 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 Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
31398RM (OT) No. 5800-1/16
1 page  
LC75874E, 75874W
Pin Functions
Symbol
S1/P1 to S8/P8
S9 to S66
Pin No.
LC75874E LC75874W
Function
1 to 8
9 to 66
79, 80, Segments outputs for displaying the display data transferred by serial data
1 to 6 input. The S1/P1 to S8/P8 pins can be used as general-purpose output
7 to 64 ports under serial data control.
COM1
COM2
COM3
COM4
67 65
68 66
69 67 Common driver outputs. The frame frequency fo is fOSC/512 Hz.
70 68
OSC
76
74
Oscillator connection. An oscillator circuit can be formed by connecting an
external resistor and capacitor at this pin.
CE
CL
DI
INH
VLCD1
78 76 Serial data transfer inputs. Connected to the controller.
79 77 CE: Chip enable
CL: Synchronization clock
80 78 DI: Transfer data
Display off control input
INH = low (VSS) ......Display forced off
S1/P1 to S8/P8 = low (VSS)
(These pins are forcibly set to the segment output port
77 75
function and held at the VSS level.)
S9 to S66 = low (VSS)
COM1 to COM4 = low (VSS)
INH = high (VDD).....Display on
However, serial data transfer is possible when the display is forced off by
this pin.
Used to apply the LCD drive 2/3 bias voltage externally. Connect this pin to
73 71 VLCD2 when using a 1/2-bias drive scheme.
VLCD2
VDD
VLCD
VSS
Used to apply the LCD drive 1/3 bias voltage externally. Connect this pin to
74 72 VLCD1 when using a 1/2-bias drive scheme.
71 69 Logic block power supply. In the range 2.7 to 6.0 V.
72 70 LCD driver block power supply. In the range 2.7 to 6.0 V.
75 73 Ground pin. Connect to ground.
Pin Assignments
Active
Handling
I/O when unused
— O Open
— O Open
— I/O VDD
HI
I GND
—I
L I GND
— I Open
— I Open
——
——
——
—
—
—
Top view
No. 4465No. 5800-5/16
5 Page 
1/4-Duty 1/2-Bias Drive Scheme
LC75874E, 75874W
COM1
COM2
COM3
COM4
LCD driver output when all LCD segments
corresponding to COM1, COM2, COM3, and
COM4 are off.
LCD driver output when only LCD segments
corresponding to COM1
are on (lit).
LCD driver output when only LCD segments
corresponding to COM2
are on.
LCD driver output when LCD
segments corresponding to COM1
and COM2 are on.
LCD driver output when only LCD segments
corresponding to COM3
are on.
LCD driver output when LCD
segments corresponding to COM1
and COM3 are on.
LCD driver output when LCD
segments corresponding to COM2
and COM3 are on.
LCD driver output when LCD segments
corresponding to COM1, COM2, and COM3
are on.
LCD driver output when only LCD segments
corresponding to COM4 are on.
LCD driver output when LCD segments
corresponding to COM2 and COM4 are on.
LCD driver output when all LCD segments
corresponding to COM1, COM2, COM3, and
COM4 are on.
1/4-Duty 1/2-Bias Waveforms
No. 4465-No. 5800-11/16
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet LC75874.PDF ] | |
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