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LC75854W Schematic ( PDF Datasheet ) - Sanyo Semicon Device
| Teilenummer | LC75854W |
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| Beschreibung | 1/4 Duty LCD Display Drivers with Key Input Function | |
| Hersteller | Sanyo Semicon Device | |
| Logo |  |
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Gesamt 25 Seiten 
Ordering number : ENN5066B
CMOS IC
LC75854E, 75854W
1/4 Duty LCD Display Drivers
with Key Input Function
Overview
The LC75854E and LC75854W are 1/4 duty LCD display
drivers that can directly drive up to 164 segments and can
control up to four general-purpose output ports. These
products also incorporate a key scan circuit that accepts
input from up to 30 keys to reduce printed circuit board
wiring.
Features
• Key input function for up to 30 keys (A key scan is
performed only when a key is pressed.)
• 1/4 duty - 1/2 bias and 1/4 duty - 1/3 bias drive schemes
can be controlled from serial data (up to 164 segments).
• Sleep mode and all segments off functions that are
controlled from serial data
• Segment output port/general-purpose output port
function switching that is controlled from serial data
• Serial data I/O supports CCB format communication
with the system controller.
• Direct display of display data without the use of a
decoder provides high generality.
• Provision of an on-chip voltage-detection type reset
circuit prevents incorrect displays.
• RC oscillator circuit
Package Dimensions
unit: mm
3159-QFP64E
1.0
48
49
[LC75854E]
17.2
14.0
1.6
0.8
0.35
1.0
33
32
0.15
64
1
17
16
0.1
2.7
unit: mm
3190-SQFP64
15.6
0.8
SANYO: QFP64E
1.25
48
49
[LC75854W]
12.0
10.0
0.5 0.18
1.25
33
32
0.15
64
1
17
16
• 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.
0.5 0.5
SANYO: SQFP64
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
O3099TH (OT)/N3095HA (OT)/52295TH (OT) No. 5066-1/25
 
Pin Functions
Pin Pin No.
S1/P1 to S4/P4
S5 to S39
1 to 4
5 to 39
COM1
COM2
COM3
COM4
40
41
42
43
LC75854E, 75854W
Function
Segment outputs for displaying the display data transferred by serial data
input.
The S1/P1 to S4/P4 pins can be used as general-purpose output ports
under serial data control.
Common driver outputs
The frame frequency fO is given by: fO = (fOSC/512) Hz.
Active
Handling
I/O when unused
— O Open
— O Open
KS1/S40,
KS2/S41,
KS3 to KS6
44
45
46 to 49
Key scan outputs
Although normal key scan timing lines require diodes to be inserted in the
timing lines to prevent shorts, since these outputs are unbalanced CMOS
transistor outputs, these outputs will not be damaged by shorting when
these outputs are used to form a key matrix. The KS1/S40 and KS2/S41
pins can be used as segment outputs when so specified by the control data.
—
O Open
KI1 to KI5
OSC
CE
CL
DI
DO
TEST
VDD1
VDD2
VDD
VSS
50 to 54
60
62
63
64
61
55
57
58
56
59
Key scan inputs
These pins have built-in pull-down resistors.
Oscillator connection
An oscillator circuit is formed by connecting an external resistor and
capacitor at this pin.
Serial data interface connections to the controller. Note that DO, being an
open-drain output, requires a pull-up resistor.
CE: Chip enable
CL: Synchronization clock
DI: Transfer data
DO: Output data
This pin must be connected to ground.
Used for applying the LCD drive 2/3 bias voltage externally. Must be
connected to VDD2 when a 1/2 bias drive scheme is used.
Used for applying the LCD drive 1/3 bias voltage externally. Must be
connected to VDD1 when a 1/2 bias drive scheme is used.
Power supply connection. Provide a voltage of between 4.5 and 6.0 V.
Power supply connection. Connect to ground.
H I GND
— I/O VDD
HI
I GND
—I
— O Open
—I
—
— I Open
— I Open
——
——
—
—
No. 5066-6/25
6 Page 
LC75854E, 75854W
Sleep Mode Functions
Sleep mode is set up by setting S0 or S1 in the control data to 1. The segment outputs will all go low and the common
outputs will also go low, and the oscillator on the OSC pin will stop (it will be started by a key press). This reduces
power dissipation. This mode is cleared by sending control data with both S0 and S1 set to 0. However, note that the
S1/P1 to S4/P4 outputs can be used as general-purpose output ports according to the state of the P0 and P1 control data
bits, even in sleep mode. (See the control data description for details.)
Key Scan Operation Functions
1. Key scan timing
The key scan period is 384 T (s). To reliably determine the on/off state of the keys, the LC75854E/W scans the keys
twice and determines that a key has been pressed when the key data agrees. It outputs a key data read request (a low
level on DO) 800 T (s) after starting a key scan. If the key data does not agree and a key was pressed at that point, it
scans the keys again. Thus the LC75854E/W cannot detect a key press shorter than 800 T (s).
Note: *3. In sleep mode the high/low state of these pins is determined by the S0 and S1 bits in the control data. Key scan output signals are not output
from pins that are set low.
2. In normal mode
• The pins KS1 to KS6 are set high
• When a key is pressed a key scan is started and the keys are scanned until all keys are released. Multiple key
presses are recognized by determining whether multiple key data bits are set.
• If a key is pressed for longer than 800 T (s) (where T = 1 ) the LC75854E/W outputs a key data read request (a
fOSC
low level on DO) to the controller. The controller acknowledges this request and reads the key data. However, if
CE is high during a serial data transfer, DO will be set high.
• After the controller reads the key data, the key data read request is cleared (DO is set high) and the LC75854E/W
performs another key scan. Also note that DO, being an open-drain output, requires a pull-up resistor (between 1
and 10 kΩ).
No. 5066-12/25
12 Page | ||
| Seiten | Gesamt 25 Seiten | |
| PDF Download | [ LC75854W Schematic.PDF ] | |
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