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SC75823B Schematic ( PDF Datasheet ) - Silan Microelectronics

Teilenummer SC75823B
Beschreibung 1/3 DUTY GENERAL-PURPOSE LCD DRIVER
Hersteller Silan Microelectronics
Logo Silan Microelectronics Logo 




Gesamt 16 Seiten
SC75823B Datasheet, Funktion
Silan
Semiconductors
SC75823
1/3 DUTY GENERAL-PURPOSE LCD
DRIVER
DESCRIPTION
The SC75823 is a general-purpose LCD driver that can be used
for frequency display in microprocessor-controlled radio receives
and in other display applications. In addition to being able to directly
drive up to 156 LCD segments.
QFP-64-14x14-0.8
FEATURES
Supports both 1/3 duty 1/2 bias and 1/3 duty 1/3 bias LCD
drive of up to 156 segments under serial data control.
Serial data input supports CCB format communication with the
system controller.
LQFP-64-10 x 10-0.5
Serial data control of the power-saving mode based backup
function and all the segments forced off function.
High generality since display data is displayed directly without ORDERING INFORMATION
decoder intervention.
Device
Package
The INH pin can force the display to the off state.
SC75823A LQFP-64-10 X 10-0.5
The LCD drive bias voltage can be provided internally or SC75823B QFP-64-14 X 14-0.8
externally.
Power supply voltage: 4.5 to 6.0V
BLOCK DIAGRAM
COM1 COM2 COM3
S52 S51
VDD1
VDD2
INH
Common Driver
OSC
Clock
Generator
Latch & Driver
Shift Register
Address
Detector
S1
DI CL CE
VDD VSS
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.1 2002.03.04
1






SC75823B Datasheet, Funktion
Silan
Semiconductors
SC75823
PIN DESCRIPTION
Pin No Symbol
I/O
1-52
53
54
55
S1 to S52
COM1
COM2
COM3
O
O
61 OSC
I/O
62 CE
63 CL
64 DI
I
57 INH
I
58 VDD1
59 VDD2
56 VDD
60 VSS
I
I
--
--
Description
Segment outputs for displaying the display data transferred by serial data
input.
Common driver outputs. The frame frequency fO is given by:
fO=(fOSC/384)Hz
Oscillator connection
An oscillator circuit is formed by connecting an external resistor and
capacitor to this pin.
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)……Display forced off (S1 to S52, COM1 to COM3=low)
INH =high (VDD)……Display on
note that serial data transfers can be performed when the display is forced
off.
Used for the 2/3 bias voltage when bias voltage are provided externally.
Connect to VDD2 when 1/2 bias is used.
Used for the 1/3 bias voltage when bias voltage are provided externally.
Connect to VDD1 when 1/2 bias is used.
Power supply. Provide a voltage of between 4.5 and 6.0V
Ground. Connect this pin to the system ground.
FUNCTION DESCRIPTION
Serial data transfer format
1. When CL is stopped at the low level
CE
CL
DI
10000010
D1 D2 D3
D154 D155 D156 DR SC BU *
B0 B1 B2 B3 A0 A1 A2 A3
CCB address 8 bits
Display data 156 bits
Control data 4 bits
*: don't care
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.1 2002.03.04
6

6 Page









SC75823B pdf, datenblatt
Silan
Semiconductors
SC75823
1/3 Bias, 1/3 Duty Drive Technique
COM1
COM2
COM3
LCD driver output when all LCD
segments corresponding to COM1,
COM2, and COM3 are turnned off.
LCD driver output when only LCD
segments corresponding to COM1,
are on.
LCD driver output when only LCD
segments corresponding to COM2,
are on.
LCD driver output when LCD
segments corresponding to
COM1and 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 all LCD
segments corresponding to
COM1,COM2, and COM2 are on.
VDD
VDD1 (2/3 VDD)
VDD2 (1/3 VDD)
VSS
VDD
VDD1
VDD2
VSS
VDD
VDD1
VDD2
VSS
VDD
VDD1
VDD2
VSS
VDD
VDD1
VDD2
VSS
VDD
VDD1
VDD2
VSS
VDD
VDD1
VDD2
VSS
VDD
VDD1
VDD2
VSS
VDD
VDD1
VDD2
VSS
VDD
VDD1
VDD2
VSS
VDD
VDD1
VDD2
VSS
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.1 2002.03.04
12

12 Page





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