KS0741
128 SEG / 129 COM DRIVER & CONTROLLER FOR 4 GRAY SCALE STN LCD
February 8. 2000.
Ver. 1.2
Prepared by: Hyung-Suk, Kim
highndry@samsung.co.kr
Contents in this document are subject to change without notice. No part of this document may be reproduced or
transmitted in any form or by any means, electronic or mechanical, for any purpose, without the express written
permission of LCD Driver IC Team.
128 SEG / 129 COM DRIVER & CONTROLLER FOR STN LCD PRELIMINARY SPEC. VER. 1.2 KS0741
2
KS0741 Specification Revision History
Version
Content
Date
0.0
Preliminary specification (short form)
June 8, 1999
0.1
Preliminary specification (full set)
July 14, 1999
0.2
Added temporary pin number (page 5,6)
July 15, 1999
0.3
Removed HPMB, CS2 pins
CS1B pin
CSB pin
V
OL
Max.: 0.3V
DD
0.2V
DD
, V
OH
Min.: 0.7V
DD
0.8V
DD
(page 59)
July 30, 1999
0.4
Removed CLS, OSCCK, OSC2 pins (page 7,8)
Read internal status: MF, DS ID is added, ADC is removed (Page 35, 39)
RESET flag: 0: display ON, 1: display OFF
0: display OFF, 1: display ON (Page 39)
Aug. 12, 1999
0.5
Changed input pin order, add RESETB pin (page 5)
Added VR, VEXT pin connection (page 8)
VR: When using internal resistors (INTRS = "H"), open this pin
VEXT: When using internal voltage regulator, connect to VDD, VSS or open this pin
Added test pin connection (page 9)
TEST1,TEST2: connect to " VDD"
TEST3,TEST4,TEST5: connect to " VSS"
Changed OSC resistance connection (page8, 23)
Between OSC1 and OSC2
between OSC1 and VDD
Aug. 30, 1999
0.6
Removed TEST2, TEST3, TEST4, TEST5, TEST6, TEST7 pins
Added COMS, COMS1 for ICON display.
Added ICON control register ON/OFF instruction.
Sep. 30, 1999
0.7
Remove COMS, COMS1 for ICON display.
Remove ICON control register ON/OFF instruction.
Oct. 4, 1999
1.0
Added COMS, COMS1 for ICON display.
Added ICON control register ON/OFF instruction.
Modified bit settings for partial display command.
Relaxed V
IH
and V
IL
specifications.
Modified interface timing specs.
Jan. 18, 2000
1.1
Added 6800-mode interface description for data latch with (page 14)
C2 CAP value : 0.1 to 0.47uF
0.47 to 2.0uF (page 34)
Added Icon Mode Disabled to the Reset default list. (page 36)
Added description of the column address operation. (page 40)
Added that Display On/Off command has priority over Entire Display On/Off and
Reverse Display On/Off. (page 44)
Added N-line inversion command description (page 47)
The lower limit of VOUT, V0 - V4 : +0.3V
-0.3V (page 60)
Jan. 24, 2000
1.2
The upper limit of V1 - V4 : V0
V0 + 0.3V (page 60)
Feb. 8, 2000
KS0741 PRELIMINARY SPEC. VER. 1.2 128 SEG / 129 COM DRIVER & CONTROLLER FOR STN LCD
3
CONTENTS
INTRODUCTION ................................................................................................................................................. 1
FEATURES ......................................................................................................................................................... 1
BLOCK DIAGRAM .............................................................................................................................................. 3
PAD CONFIGURATION ...................................................................................................................................... 4
PAD Center Coordinates ................................................................................................................................... 6
PIN DESCRIPTION ............................................................................................................................................. 6
POWER SUPPLY..........................................................................................................................................9
LCD DRIVER SUPPLY..................................................................................................................................9
SYSTEM CONTROL ...................................................................................................................................10
MICROPROCESSOR INTERFACE .............................................................................................................11
LCD DRIVER OUTPUTS .............................................................................................................................13
FUNCTIONAL DESCRIPTION........................................................................................................................... 14
MICROPROCESSOR INTERFACE .............................................................................................................14
DISPLAY DATA RAM (DDRAM) ..................................................................................................................18
LCD DISPLAY CIRCUITS............................................................................................................................21
LCD DRIVER CIRCUIT ...............................................................................................................................26
POWER SUPPLY CIRCUITS ......................................................................................................................29
REFERECE CIRCUIT EXAMPLES..............................................................................................................34
RESET CIRCUIT .........................................................................................................................................36
INSTRUCTION DESCRIPTION.......................................................................................................................... 37
SPECIFICATIONS............................................................................................................................................. 60
ABSOLUTE MAXIMUM RATINGS...............................................................................................................60
DC CHARACTERISTICS.............................................................................................................................61
AC CHARACTERISTICS .............................................................................................................................64
REFERENCE APPLICATIONS.......................................................................................................................... 68
MICROPROCESSOR INTERFACE .............................................................................................................68
CONNECTIONS BETWEEN KS0741 AND LCD PANEL..............................................................................70
KS0741 PRELIMINARY SPEC. VER. 1.2 128 SEG / 129 COM DRIVER & CONTROLLER FOR STN LCD
1
INTRODUCTION
The KS0741 is a driver & controller LSI for 4-level gray scale graphic dot-matrix liquid crystal display systems. It
contains 128 segment and 129 common driver circuits. This chip is connected directly to a microprocessor, accepts
Serial Peripheral Interface(SPI) or 8-bit parallel display data and stores in an on-chip display data RAM of 128 x 129
x 2 bits. It performs display data RAM read/write operation with no external operating clock to minimize power
consumption. In addition, because it contains power supply circuits necessary to drive liquid crystal, it is possible to
make a display system with the fewest components.
FEATURES
4-level (White, Light Gray, Dark Gray, Black) Gray Scale Display with PWM and FRC Methods
DDRAM data [2n: 2n+1]
00
01
10
11
Gray scale
White
Light gray
Dark gray
Dark
(Accessible column address, n = 0, 1, 2, ......, 125, 126, 127)
Driver Output Circuits
-
128 segment outputs / 129 common outputs
Applicable Duty Ratios
Duty ratio
Applicable LCD bias
Maximum display area
1/16 ~ 1/128 (ICON disabled)
1/17 ~ 1/129 (ICON enabled)
1/5 to 1/12
129
128
-
Various partial display
-
Partial window moving & data scrolling
On-chip Display Data RAM
-
Capacity: 129
128
2 = 33,024bits
-
Bit data "1": a dot of display is illuminated.
-
Bit data "0": a dot of display is not illuminated.
Microprocessor Interface
-
8-bit parallel bi-directional interface with 6800-series or 8080-series
-
SPI (serial peripheral interface) available (only write operation)
On-chip Low Power Analog Circuit
-
On-chip oscillator circuit
-
Voltage converter (x3, x4,
5 or x6)
-
Voltage regulator (temperature coefficient: -0.05%/
C, or external input)
-
On-chip electronic contrast control function (64 steps)
-
Voltage follower (LCD bias : 1/5 to 1/12)
Operating Voltage Range
-
Supply voltage (V
DD
): 1.8 to 3.3V
-
LCD driving voltage (V
LCD
= V0 - V
SS
): 4.0 to 15.0 V
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