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RCM2228R-A / B
Liquid Crystal Displays
16 characters x 2 lines COG module
RCM2228R-A / B
The RCM2228R-A / B is a reflective TN type liquid crystal module with a built-in controller / driver LSI and a display capacity of 16 characters x 2 lines.
Applications Printers, Copiers, Facsimiles, etc
Features (1) 5x7 dot character matrix with cursor. (2) Interfaces with 4-bit MPUs. (3) Displays up to 237 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
7.0MAX 0.70.7 (0.5) 6.0MAX 2 0.70.7
0.70.7
1
0.70.7
1.0MAX. 0.3MAX. 12.40.3
50.00.3 (PITCH1.8x9)16.20.3 Over-coating regin
10.00.5 1.5MAX
No.10
No.1
12.0MIN. 9.0MIN.
10.0MAX.
8.00.3
0.70.7
12.30.3
8.70.7
(0.3)
22.0MAX.
26.00.3
25.0MAX.
9.40.2
24.0MIN.
(18.0)
Shield tape
n ctio ire g d 6:00 win
Vie
0.70.7
2.0MAX. 4.050.3 41.90.2 48.0MIN.
1.10.1
0.7
4.35
0.05
0.5
0.39
2.15 0.05
0.5
Dot de tail
0.70.7
2.70.3 1.10.1
4.0MAX
5
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RCM2228R-A / B
Liquid Crystal Displays
Block diagram
VR
RRE S/ W
DD B~B 47 SEG1~80
VVV
S S 0 D D
COM 9~16
16characterx2lines
COM 1~8
Pin assignments
Pin No. 1 2 3 4 5 Symbol RS R/W E DB4 DB5 Pin No. 6 7 8 9 10 Symbol DB6 DB7 VSS VDD V0
Power supply example
VDD
LCD MODULE V0 VSS
VDD-V0
VDD VR
VDD-V0 : LCD drive voltage
Fig.1
Absolute maximum ratings (Ta=25C)
Parameter Power voltage for logics Power voltage for driving LCD Input voltage Operating temperature Storage temperature Symbol Min. -0.3 -0.3 -0.3 0 -20 Max. 6.0 6.0 Unit V V V
VDD VLCD VIN
Topr Tstg
VDD+0.3
50 70
C C
2/7
RCM2228R-A / B
Liquid Crystal Displays
Electrical characteristics (VDD=5.0V, Ta=25C)
Parameter Logic power voltage LCD driving voltage "H" input voltage "L" input voltage "H" output voltage "L" output voltage Clock frequency Current consumption Symbol VDD Min. 4.75 3.0 0.7VDD VSS-0.3 Typ. 5.0 - - - - - 540 0.5 Max. 5.25 5.0 VDD Unit V V V V V V kHz mA RS, R / W, CS IOH= -0.1mA IOL=0.1mA Conditions
VLCD VIH VIL VOH VOL
fosc
0.6
-
0.75VDD
VSS 350 -
0.2VDD
1100 1.0
IDD
VDD=5.0V, fosc=270kHz check pattem
Optical characteristics (Ta=25C) When viewing from below
Parameter Response time Response time Contrast ratio Symbol Min. - - - - 40 Typ. 100 150 3.0 - - - Max. 250 250 - 10 - - Unit ms ms - deg deg deg Conditions =0, =10 =0, =10 =0, =10 K >1.4, =0 K >1.4, =10
tr td
K
1
Viewing angle
2
30
(1) Definition and
Z (=0)
(2) Definition of viewing angles 1 and 2
Viewing direction 12 o'clock
Y (=180)
1' 1
Contrast ratio
X
2'
2
1.4
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
10%
3/7
RCM2228R-A / B
Liquid Crystal Displays
Terminal function
Symbol VDD VSS V0 DB4DB7 I / O Terminal Input Input Input Input / Output VDD=4.755.25V VSS=0V LCD driving voltage input terminal VDD V0 VSS Data bus four-state bi-directional Register selected signal L: Instruction register (at write) L: 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 Function
RS
Input
R/W E
Input Input
Timing chart Writing
RS R/W tAW6 tAH6
CSB
tCYC6
tEWH E tr tf tDS6 D0 to D7 (Write) tACC6 D0 to D7 (Read) tOH6 tDH6
tEWL
Fig.6 interface (Write Operation)
Item Address hold time Address set up time System cycle time Data setup time Data hold time Access time Output disable time "E" rise / fall time "E" pulse width H level "E" pulse width L level
In designing, please set the timing with sufficient margin
Terminal RS RS RS D0 to D7 D0 to D7 D0 to D7 D0 to D7 E E E
Symbol tAH6 tAW6 tCYC6 tDS6 tDH6 tACC6 tOH6 tr, tf tEWH tEWL
Min. 20 20 150 80 20 - 150 - 120 30
Max. - - - - - 400 - 20 - -
Unit ns ns ns ns ns ns ns ns ns
4/7
RCM2228R-A / B
Liquid Crystal Displays
Instruction
Instruction Code Instruction Description
RS RW D7
Display Clear
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 operations 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)
Time (MAX)
0
0
0
1.08ms
Cursor Home
0
0
0
0
0
0
0
0
1
1.08ms
Entry Mode Set
0
0
0
0
0
0
0
1 I/D S
26.3s
Display ON / OFF Control
0
0
0
0
0
0
1
D
C
B
26.3s
Cursor or Display Shift
0
0
0
0
0
1 S/C R/L
26.3s
Function Set
0
0
0
0
1
DL
N
26.3s
CGRAM Address set DDRAM Address set Busy flag Address counter read Data write Data read
0 0
0 0
0 1
1
A5 A4 A3 A2 A1 A0 Assigns the CGRAM address
26.3s 26.3s
A6 A5 A4 A3 A2 A1 A0 Assigns the DDRAM address
0
1
BF: Reads the internal operation state BF A6 A5 A4 A3 A2 A1 A0 (1: In operation, 0: Completed operation) AC: Reads the address counter value.
0s
1 1
0 1
D7 D6 D5 D4 D3 D2 D1 D0 Writes data into DD / CGRAM D7 D6 D5 D4 D3 D2 D1 D0 Read data from DD / CGRAM
26.3s 26.3s
( : don't care )
Note: Refer to Instruction table for the list of each instruction execution time.
5/7
RCM2228R-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)
6/7
RCM2228R-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.
7/7
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 use silicon as a basic material. 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-Rev1.0

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