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PDF LC75814V Data sheet ( Hoja de datos )
| Número de pieza | LC75814V | |
| Descripción | 1/4 Duty General-Purpose LCD Driver | |
| Fabricantes | ON Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LC75814V (archivo pdf) en la parte inferior de esta página. Total 14 Páginas | ||
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Ordering number : EN6792
LC75814V
CMOS LSI
1/4 Duty General-Purpose
LCD Driver
http://onsemi.com
Overview
The LC75814V 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 LC75814V can drive an LCD with up to 64
segments directly. The LC75814V can also control up to 4 general-
purpose output ports. Since the LC75814V 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 64
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
SSOP30(275mil)
Package Dimensions
unit : mm (typ)
9.75
30
1
0.65
(0.33)
0.22
0.15
CCB is ON Semiconductor® ’s original format. All addresses are managed
by ON Semiconductor® for this format.
CCB is a registered trademark of Semiconductor Components Industries, LLC.
ORDERING INFORMATION
See detailed ordering and shipping information on page 14 of this data sheet.
Semiconductor Components Industries, LLC, 2013
October, 2013
71001TN (OT) No.6792-1/14
1 page  
LC75814V
Pin Functions
Pin
S1/P1 to
S4/P4
S5 to S16
COM1
COM2
COM3
COM4
OSC
CE
CL
DI
INH
VLCD1
VLCD2
VDD
VLCD
VSS
Pin No.
Function
1 to 4
5 to 16
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.
17 to 20 The frame frequency fO is given by: fO = (fOSC/512) Hz.
26 Oscillator connection
An oscillator circuit is formed by connecting an external resistor and capacitor to this pin.
28
29
30
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
27
fixed at the VSS level.)
S5 to S16 = 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
23 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
24 VLCD1 when 1/2 bias drive is used.
21 Logic block power supply. Provide a voltage in the range 2.7 to 6.0 V.
22 LCD driver block power supply. Provide a voltage in the range 2.7 to 6.0 V.
25 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 1 1 1 1 0 0 1 0 D1 D2 D3
B0 B1 B2 B3 A0 A1 A2 A3
CCB address
8 bits
D21 D22 D23 D24 D25 D26 D27 D28 D29 D30 D31 D32 0 P0 P1 P2 DR SC BU 0
Display data
32 bits
Control data
7 bits
DD
1 bit
1 1 1 1 0 0 1 0 D33 D34 D35
B0 B1 B2 B3 A0 A1 A2 A3
CCB address
8 bits
Note: DD ... Direction data
D53 D54 D55 D56 D57 D58 D59 D60 D61 D62 D63 D64 0 0 0 0 0 0 0 1
Display data
32 bits
Fixed data
7 bits
DD
1 bit
ILC00273
No. 6792-5/14
5 Page 
LC75814V
The INH pin and Display Control
Since the IC internal data (the display data D1 to D64 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 S16, 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 LC75814V 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.
VDD
t1
t2
t3
VLCD
INH
CE
Internal data
D1 to D32
P0 to P2
DR, SC, BU
Internal data (D33 to D64)
Display and control data transfer
Undefined
VIL
tc
VIL
Defined
Undefined
Defined
Undefined
Note: t1 ≥ 0
t2 > 0
Undefined
t3 ≥ 0 (t2 > t3)
tc ... 10 µs min
Figure 3
ILC00278
Notes on Controller Transfer of Display Data
Since the LC75814V accept display data (D1 to D64) 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. 6792-11/14
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet LC75814V.PDF ] | |
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