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PDF LC75847T Data sheet ( Hoja de datos )
| Número de pieza | LC75847T | |
| Descripción | General-Purpose LCD Driver | |
| Fabricantes | ON Semiconductor | |
| Logotipo |  |
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LC75847T
CMOS LSI
1/3, 1/4 Duty General-Purpose
LCD Driver
www.onsemi.com
Overview
The LC75847T is 1/3 duty and 1/4 duty general-purpose LCD driver that can be
used for frequency display in electronic tuners under the control of a
microcontroller. The LC75847T can drive an LCD with up to 420 segments
directly. The LC75847T can also control up to 8 general-purpose output ports.
Features
Switching between 1/3 duty and 1/4 duty drive techniques under serial data control.
TQFP120 14x14
Switching between 1/2 bias and 1/3 bias drive techniques under serial data control.
Up to 318 segments for 1/3 duty drive and 420 segments for 1/4 duty drive can be displayed.
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.
Serial data control of frame frequency for common and segment output waveforms.
High generality, since display data is displayed directly without decoder intervention.
Built-in display contrast adjustment circuit
Independent VLCD for the LCD driver block
The INH pin can force the display to the off state.
RC oscillator circuit
Specifications
Absolute Maximum Ratings at Ta = 25C, VSS = 0V
Parameter
Symbol
Conditions
Maximum supply voltage
Input voltage
Output voltage
Output current
Allowable power dissipation
VDD max
VLCD max
VIN1
VIN2
VIN3
VOUT1
VOUT2
IOUT1
IOUT2
IOUT3
Pd max
VDD
VLCD
CE, CL, DI, INH
OSC
VLCD1, VLCD2
OSC
VLCD0, S1 to S106, COM1 to COM4, P1 to P8
S1 to S106
COM1 to COM4
P1 to P8
Ta = 85°C
Operating temperature
Topr
Storage temperature
Tstg
Ratings
–0.3 to +7.0
–0.3 to +7.0
–0.3 to +7.0
–0.3 to VDD +0.3
–0.3 to VLCD +0.3
–0.3 to VDD +0.3
–0.3 to VLCD +0.3
300
3
5
200
–40 to +85
–55 to +125
unit
V
V
V
A
mA
mA
mW
C
C
Stresses exceeding those listed in the Maximum Ratings table may damage the device. If any of these limits are exceeded, device functionality should not be assumed,
damage may occur and reliability may be affected.
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 28 of this data sheet.
© Semiconductor Components Industries, LLC, 2013
October 2013 - Rev. 0
1
Publication Order Number :
LC75847T/D
1 page  
LC75847T
Pin Functions
Symbol
Pin No.
Function
S1/P1 to S8/P8
S9 to S105
1 to 8 Segment outputs for displaying the display data transferred by serial data input. The
pins S1/P1 to S8/P8 can be used as general-purpose output ports when so set up by
9 to 105 the control data.
COM1 to COM3
COM4/S106
Common driver outputs.
109 to 107
106 The frame frequency is fO Hz.
The COM4/S106 pin can be used as a segment output in 1/3 duty.
OSC
Oscillator connection.
116 An oscillator circuit is formed by connecting an external resistor and capacitor to this
pin.
CE
CL
DI
INH
VLCD0
VLCD1
118 Serial data transfer inputs. These pins are connected to the control microprocessor.
119 CE: Chip enable
CL: Synchronization clock
120 DI: Transfer data
Display off control input
• INH = low (VSS) ....Off
S1/P1 to S8/P8 = low (VSS)
(These pins are forcibly set to the segment output port function
and fixed at the VSS level.)
117 S9 to S105 = low (VSS)
COM1 to COM3 = low (VSS)
COM4/S106 = low (VSS)
• INH = high (VDD) ..On
Note that serial data transfers can be performed when the display is forced off by this
pin.
LCD drive 3/3 bias voltage (high level) supply. This level can be modified using the
112
display contrast adjustment circuit. However, note that VLCD0 must be greater than or
equal to 2.7 V. Also, since this IC provides the built-in display contrast adjustment
circuit, applications must not attempt to provide this level from external circuits.
113
LCD drive 2/3 bias voltage (middle level) supply. It is possible to supply the 2/3 VLCD0
voltage to this pin externally. This pin must be shorted to VLCD2 if 1/2 bias is used.
VLCD2
VDD
VLCD
VSS
114
LCD drive 1/3 bias voltage (middle level) supply. It is possible to supply the 1/3 VLCD0
voltage to this pin externally. This pin must be shorted to VLCD1 if 1/2 bias is used.
110 Logic block power supply. Provide a voltage in the range 2.7 to 6.0 V.
LCD driver block power supply. When VLCD0 is between 0.70 VLCD and 0.95 VLCD,
111 supply a voltage in the range 4.0 to 6.0 V. When VLCD0 and VLCD will be equal, supply
a voltage in the range 2.7 to 6.0 V.
115 Ground pin. Connect to ground.
Active
—
—
—
H
—
L
—
—
—
—
—
—
Handling
I/O when unused
O Open
O Open
I/O VDD
I
I GND
I
I GND
O Open
I Open
I Open
——
——
——
No. 7389-5/27
5 Page 
LC75847T
Serial Data Transfer Example
1. 1/3 duty
x When 214 or more segments are used
All 384 bits of serial data must be sent.
8 bits
1 0 1 0 0 0 0 1 D1
B0 B1 B2 B3 A0 A1 A2 A3
128 bits
D104 D105 D106 D107 D108 0 0 0 0 0 0 P0 P1 P2 P3 CT0 CT1 CT2 DR DT FC SC BU 0 0
1 0 1 0 0 0 0 1 D109
B0 B1 B2 B3 A0 A1 A2 A3
D212 D213 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1
1 0 1 0 0 0 0 1 D214
B0 B1 B2 B3 A0 A1 A2 A3
D317 D318 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0
y When fewer than 214 segments are used
Either 128 or 256 bits of serial data may be sent, depending on the number of segments used. However, the serial data
shown below (the D1 to D108 display data and the control data) must be sent.
8 bits
1 0 1 0 0 0 0 1 D1
B0 B1 B2 B3 A0 A1 A2 A3
128 bits
D104 D105 D106 D107 D108 0 0 0 0 0 0 P0 P1 P2 P3 CT0 CT1 CT2 DR DT FC SC BU 0 0
2. 1/4 duty
x When 317 or more segments are used
All 512 bits of serial data must be sent.
8 bits
1 0 1 0 0 0 0 1 D1
B0 B1 B2 B3 A0 A1 A2 A3
128 bits
D104 D105 D106 D107 D108 0 0 0 0 0 0 P0 P1 P2 P3 CT0 CT1 CT2 DR DT FC SC BU 0 0
1 0 1 0 0 0 0 1 D109
B0 B1 B2 B3 A0 A1 A2 A3
D212 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1
1 0 1 0 0 0 0 1 D213
B0 B1 B2 B3 A0 A1 A2 A3
D316 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0
1 0 1 0 0 0 0 1 D317
B0 B1 B2 B3 A0 A1 A2 A3
D420 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1
y When fewer than 317 segments are used
Either 128, 256 or 384 bits of serial data may be sent, depending on the number of segments used. However, the serial
data shown below (the D1 to D108 display data and the control data) must be sent.
8 bits
1 0 1 0 0 0 0 1 D1
B0 B1 B2 B3 A0 A1 A2 A3
128 bits
D104 D105 D106 D107 D108 0 0 0 0 0 0 P0 P1 P2 P3 CT0 CT1 CT2 DR DT FC SC BU 0 0
No. 7389-11/27
11 Page | ||
| Páginas | Total 28 Páginas | |
| PDF Descargar | [ Datasheet LC75847T.PDF ] | |
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