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RCM2234R-A / B
Liquid Crystal Displays
20 characters x 2 lines COG module
RCM2234R-A / B
The RCM2234R-A / B is a reflective TN type liquid crystal module with a built-in controller / driver LSI and a display capacity of 20 characters x 2 lines.
Applications Printers, Copiers, Facsimiles, etc
Features (1) 5x7 dot character matrix with cursor. (2) Interfaces with 4-bit, 8-bit MPUs. (3) Displays up to 240 characters and special symbols. (4) Custom character patterns are displayed with the character RAM. (5) Abundant instruction set including clear display, cursor on/off, and character blinking. (6) Compact and lightweight for easy assembly to the host instrument. (7) Operable on single 5V power supply. (8) Low power consumption.
External dimensions (Unit : mm) (Viewing direction : 6 : 00)
5
6.0MAX.
(0.5)
6.0MAX.
0.70.7
0.70.7
0.70.7
0.70.7
1.0MAX.
81.00.3
10.60.5
(PITCH1.8x14)25.20.3
1.5MAX.
8.00.3
0.3MAX.
24.90.3
No.15
No.1
10.15MIN.
23.15MAX. 13.15MIN.
10.0MAX.
0.70.7
Over-coating resin
12.50.3
8.70.7
(0.3)
26.15MAX.
28.30.3
(20.3)
(11.5)
26.3MIN.
g win n Vie ectio ) dir :00 (6
0.70.7
2.0MAX.
3.750.3
(73.5)
79.0MIN.
0.70.7
2.70.3
3.2 0.05
0.5
1.10.1 1.10.1
0.65
0.6
0.4
5.55 0.05
Dot detail
4.0MAX.
5
1/8
RCM2234R-A / B
Liquid Crystal Displays
Block diagram
VR
VVV RRE DDG SLDS/ t BoB N SCD D W 07D
I
SEG1 to 100
COM 1 to 8
20charactersx2lines
COM 9 to 16
Fig.1
Note 1. (VLCDI-V5)V is applied to LCD as driving voltage. Optimal driving voltage changes by viewing angle or temperature, therefore adjusting V5 voltage in the condition that LCD is mounted on board is necessary. 2. Considering variation of power voltage and optimal driving voltage, V5 voltage should be adjustable. 3. VR : 10k to 20k (variable)
Pin assignments
Pin No. 1 2 3 4 5 symbol VSS VLCDI VDD RS R/W Pin No. 9 10 11 12 13 symbol DB2 DB3 DB4 DB5 DB6
6
E
14
DB7
7 8
DB0 DB1
15
GND
Absolute maximum ratings (Ta=25C)
Parameter Power voltage (1) Power voltage (2) Input voltage Operation temperature Storage temperature Symbol Min. -0.3 -0.3 -0.3 0 -20 Max. 7.0 12.0 Unit V V V Notes - - Input terminal - -
VDD VLCDI VIN
Topr Tstg
VDD+0.3
50 70
C C
Note 1.Use of LSI above the absolute maximum ratings may cause permanent LSI damage. 2.All voltage values are shown using VSS=0V as a reference. 3.Power supply must be retained in the relationship of VDD-VSS.
2/8
RCM2234R-A / B
Liquid Crystal Displays
Electrical characteristics (VDD=5.0V, Ta=25C)
Parameter Logic power voltage LCD power voltage H input voltage (1) L input voltage (2) H output voltage L output voltage Symbol
Terminal Name
Min. 4.75 3.0
Typ. 5.0 - - - - - 250 - 700
Max. 5.25 5.0
Unit V
Conditions
VDD VLCDI VIH VIL VOH VOL
fosc
E, RS, SEL1, DB0 to DB7 DB0 to DB7
0.7VDD VSS
VDD 0.7
-
V V V V kHz V A IOH= -100A IOL=100A LCD drive resistance
0.8VDD
- 175 3.0 -
0.2VDD
325 5.0 1400
Clock oscillation frequency
LCD driving voltage Current consumption
VLCD IDD
VDD
Check pattern
Optical characteristics (Ta=25C) (1) Viewing direction 6:00
Parameter Response time Response time Contrast ratio Symbol Min. - - - - 20 Typ. 100 150 3 - - - Max. 250 250 - 0 - - Unit ms ms - Test Conditions =10, =0 =10, =0 =10, =0 K 1.2 =0 K 1.2 =20
tr td
K
1
Viewing angle
2
deg
deg
30
(2) Viewing direction 12:00
Parameter Response time Response time Contrast ratio Symbol Min. - - - - 20 150 to 210 Typ. 100 150 3 - - - Max. 250 250 - 0 - - Unit ms ms - Test Conditions '=10, =180 '=10, =180 '=10, =180 K K 1.2 =180 1.2 '=20
tr td
K
1'
Viewing angle
2'
deg
deg
3/8
RCM2234R-A / B
Liquid Crystal Displays
(1) Definition and
Z (=0)
(2) Definition of viewing angles 1 and 2
2
Viewing direction 12 o'clock
Y (=180)
1' 1
Contrast ratio
X
2'
1.2
X'
1
Viewing angle
2
Fig.2
Y' (=180) Viewing direction 6 o'clock
Fig.3
(3) Definition of contrast ratio "K"
(4) Definition of optical response
Selected
K=B2 / B1
Brightness (%)
100
B2
Non-selected
100%
90%
B1
Selected condition
0
tr
Driving voltage
Rise time
td
Fall time
Fig.4
Fig.5
Terminal function
Symbol VSS VLCDI VDD I/O Terminal Input Input Input VSS=0V LCD driving voltage input terminal 3.0 VDD=4.75 to 5.25V Register selected signal L: Instruction register (at write) Busy flag / address counter (at read) H: Data register (at write & read) Read / Write select signal L: Write H: Read Data Read / Write enable signal Data bus four-state bi-directional Data bus four-state bi-directional VLCDI 5.0 Function
RS
Input
R/W E DB0 to DB3
DB4 to DB7
Input Input Input / Output Input / Output
10%
4/8
RCM2234R-A / B
Liquid Crystal Displays
Timing characteristics Write operation
RS R/W
vIH vIL
tAS tWH
vIH vIL
tAH
tWL vIH vIL
E
vIH vIL tr tf
tCYC tDS
D0 to D7
vIH vIL
write data
tDH
vIH vIL
tACC
tCH
vOH vOL
read data
D0 to D7
vOH vOL
Fig.6
Item Address set up time Address hold time "E" pulse width H level "E" pulse width L level Cycle time Data setup time Data hold time Output disable time Output data hold time "E" rise / fall time
Symbol tAS tAH tWH tWL tCYC tDS tDH tACC tCH tr, tf
Min. 120 120 20 500 500 1000 200 20 40
Typ.
Max. 95 10
Unit ns ns ns ns ns ns ns ns ns ns ns
Condition at write at read
Numbers above mentioned are driver IC's number as a single unit.
In designing, please set the timing with sufficient margin.
Reset Circuit
The busy flag indicating internal operating state is H level in the period of 2ms after Reset operation starting. External input is not available in this state. After 2ms passes or confirms the busy flag is L level the instruction can be acceptable. If the power supply conditions are not met, the integrated reset circuit will not operate properly. Execute initialization by instruction.
Item Power rise time Power OFF time Symbol Min. 0.1 1 Typ. - - Max. 10 - Unit ms ms Condition - -
trDD tOFF
Note : The power OFF time specifies the time during which the power is off when the instantaneous power failure occurs or power ON/OFF repeated.
VDD
0.9VDD 0.2V
0.2V
0.2V
trDD
tOFF
5/8
RCM2234R-A / B
Liquid Crystal Displays
Instruction
Instruction code Instruction RS RW D7 Display Clear 0 0 0 D6 0 D5 0 D4 0 D3 0 D2 0 D1 0 D0 1
Clears entire display and sets DDRAM address 0 in address counter. Sets DDRAM address 0 in the address counter shifted display returns to the original state. DDRAM data does not change. I/D : Specifies cursor / display shift (I/D=1 : +1 I/D=0 : -1) S : Executes the shift operation (S=1 : shift S=0 : no shift) These operation are performed during data write and read. D : All display ON / OFF (1 : ON, 0 : OFF) C : Cursor ON / OFF (1 : ON, 0 : OFF) B : Cursor position blink ON / OFF (1 : ON, 0 : OFF) Shifts the cursor or display without changing DDRAM data S / C : (1 : Display shift, 0 : Cursor shift) R / L : Specifies the shift direction (1 : Right shift, 0 : Left shift) Sets function for the internal operation DL : (1:8bit, 0:4bit) N : (1:2line, 0:1line) Assigns the CGRAM address Assigns the DDRAM address BF : Reads the internal operation state (1 : In operation, 0 : Completed operation) AC : Reads the address counter value. Writes data into DD / CGRAM Read data from DD / CGRAM ( : Don't care) Description Time (Max.)
3.3ms
Cursor Home
0
0
0
0
0
0
0
0
1
3.3ms
Entry Mode Set
0
0
0
0
0
0
0
1 I/D S
80s
Display ON / OFF Control
0
0
0
0
0
0
1
D
C
B
80s
Cursor or Display Shift
0
0
0
0
0
1 S/C R/L
80s
Function Set
0
0
0
0
1
DL
N
80s
CGRAM Address set DDRAM Address set Busy flag Address counter read Data write Data read
0 0
0 0
0 1
1
ACG ADD
80s 80s
0
1
BF
AC
- 80s 80s
1 1
0 1
Write data Read data
Note) 1.In designing, please set the timing with sufficient margin. 2.When frequency changes, operation time also change. 3.SEG / COM forward directions are prescribed as below by ITO patterns. SEG1 SEG100, COM1 COM16
6/8
RCM2234R-A / B
Liquid Crystal Displays
Character code and corresponding character pattern
UPPER
0000 0001 0010 0011 0100 0101 0110 0111 1000 1001 1010 1011 1100 1101 1110 1111 0000 CGRAM (1)
0001
(2)
0010
(3)
0011
(4)
0100
(5)
0101
(6)
0110
(7)
0111
(8)
LOWER
1000
(1)
1001
(2)
1010
(3)
1011
(4)
1100
(5)
1101
(6)
1110
(7)
1111
(8)
7/8
RCM2234R-A / B
Liquid Crystal Displays
Operation note (1) Handling precautions * Protect the module from strong shocks as they can cause damage or defective operation. * The polarizing plate on the surface of the module is soft and can easily be scratched. Wipe away dirt and dust using an alcohol-based cleanser. * If the liquid crystal panel is damaged and the liquid crystal contacts your clothing or body, wash immediately with soap and water. * If the module is to be used for long periods subjected to direct sunlight, employ a filter to block the ultravioletrays. *Do not use the module in areas of high temperature or high humidity. Do not use the module locations exposed to direct sunlight or fluorescent light. *A protective film (polyethylene) is pasted over ROHM liquid crystal modules to protect the panel surfaces. When peeling this film off, be sure to peel as slow as possible in order to minimize the generation of static electricity. (2) Precautions during operation * Do not connect or disconnect the module while the power supply is turned on. * Input the input signal after the module power supply is turned on. When turning if off, turn off the input signal first. Otherwise the IC may be damaged by the latch-up phenomenon. (3) Precautions during installation * Be sure to use a grounded soldering iron when performing any installation procedures. * Be careful to avoid damage from static electricity. A CMOS-IC is used in the modules circuitry that can be easily damaged by static electricity. (4) Precautions during unit assembly * In order to protect the polarizing plate from dirt or scratches, it is recommended to use a protective cover on the front surface. (5) Precautions for COG module * Do not subject the front and back surface of the IC to light. Doing so may cause defective operation. * When peeling off the protective film of the panel, use of an ion blower or other device to reduce the generation of static electricity is recommended. * No special measures are taken to prevent the generation of static electricity on the module. Therefore, be sure to take the appropriate measures to prevent the generation of electrical charge on the LCD module by the design of the product itself.
8/8
Appendix
Notes
No technical content pages of this document may be reproduced in any form or transmitted by any means without prior permission of ROHM CO.,LTD. The contents described herein are subject to change without notice. The specifications for the product described in this document are for reference only. Upon actual use, therefore, please request that specifications to be separately delivered. Application circuit diagrams and circuit constants contained herein are shown as examples of standard use and operation. Please pay careful attention to the peripheral conditions when designing circuits and deciding upon circuit constants in the set. Any data, including, but not limited to application circuit diagrams information, described herein are intended only as illustrations of such devices and not as the specifications for such devices. ROHM CO.,LTD. disclaims any warranty that any use of such devices shall be free from infringement of any third party's intellectual property rights or other proprietary rights, and further, assumes no liability of whatsoever nature in the event of any such infringement, or arising from or connected with or related to the use of such devices. Upon the sale of any such devices, other than for buyer's right to use such devices itself, resell or otherwise dispose of the same, no express or implied right or license to practice or commercially exploit any intellectual property rights or other proprietary rights owned or controlled by ROHM CO., LTD. is granted to any such buyer. Products listed in this document are no antiradiation design.
The products listed in this document are designed to be used with ordinary electronic equipment or devices (such as audio visual equipment, office-automation equipment, communications devices, electrical appliances and electronic toys). Should you intend to use these products with equipment or devices which require an extremely high level of reliability and the malfunction of with would directly endanger human life (such as medical instruments, transportation equipment, aerospace machinery, nuclear-reactor controllers, fuel controllers and other safety devices), please be sure to consult with our sales representative in advance. About Export Control Order in Japan Products described herein are the objects of controlled goods in Annex 1 (Item 16) of Export Trade Control Order in Japan. In case of export from Japan, please confirm if it applies to "objective" criteria or an "informed" (by MITI clause) on the basis of "catch all controls for Non-Proliferation of Weapons of Mass Destruction.
Appendix1-Rev1.1

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