RCM2228R-A / B Liquid Crystal Displays 16 characters × 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 × 2 lines. zApplications Printers, Copiers, Facsimiles, etc zFeatures (1) 5×7 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. zExternal dimensions (Unit : mm) (Viewing direction : 6 : 00) (0.5) ±5° 6.0MAX 7.0MAX 0.7±0.7 2 0.7±0.7 1 50.0±0.3 Over-coating regin ±5° (0.3) 4.0MAX 8.7±0.7 1.5MAX 0.7±0.7 10.0MAX. 9.4±0.2 12.3±0.3 No.10 No.1 8.0±0.3 12.0MIN. 9.0MIN. (18.0) 22.0MAX. 25.0MAX. 10.0±0.5 (PITCH1.8×9)16.2±0.3 12.4±0.3 0.3MAX. Shield tape n ctio ire g d 6:00 win 41.9±0.2 4.05±0.3 48.0MIN. 0.39 2.7±0.3 1.1±0.1 0.5 0.05 4.35 0.5 1.1±0.1 2.15 0.05 0.7±0.7 2.0MAX. 0.7±0.7 Vie 0.7 26.0±0.3 0.7±0.7 24.0MIN. 1.0MAX. 0.7±0.7 Dot de tail 1/7 RCM2228R-A / B Liquid Crystal Displays zBlock diagram VR R R E S / W D D B~B 4 7 V V V S S 0 D D SEG1~80 COM 9~16 COM 1~8 16character×2lines zPin assignments Pin No. Symbol Pin No. Symbol 1 RS 6 DB6 2 R/W 7 DB7 3 E 8 VSS 4 DB4 9 VDD 5 DB5 10 V0 zPower supply example VDD VDD−V0 LCD MODULE VDD V0 VR VSS VDD−V0 : LCD drive voltage Fig.1 zAbsolute maximum ratings (Ta=25°C) Symbol Min. Max. Unit Power voltage for logics Parameter VDD −0.3 6.0 V Power voltage for driving LCD VLCD −0.3 6.0 V VIN −0.3 VDD+0.3 V Operating temperature Topr 0 50 °C Storage temperature Tstg −20 70 °C Input voltage 2/7 RCM2228R-A / B Liquid Crystal Displays zElectrical characteristics (VDD=5.0V, Ta=25°C) Symbol Min. Typ. Max. Unit Logic power voltage VDD 4.75 5.0 5.25 V LCD driving voltage VLCD 3.0 − 5.0 V Parameter Conditions "H" input voltage VIH 0.7VDD − VDD V "L" input voltage VIL VSS−0.3 − 0.6 V "H" output voltage VOH 0.75VDD − − V IOH= −0.1mA "L" output voltage VOL VSS − 0.2VDD V IOL=0.1mA Clock frequency fosc 350 540 1100 kHz IDD − 0.5 1.0 mA Current consumption RS, R / W, CS VDD=5.0V, fosc=270kHz check pattem zOptical characteristics (Ta=25°C) When viewing from below Parameter Symbol Min. Typ. Max. Unit Response time tr − 100 250 ms φ=0°, θ=10° Response time td − 150 250 ms φ=0°, θ=10° Contrast ratio K − 3.0 − − φ=0°, θ=10° θ1 − − 10 deg θ2 40 − − deg φ ±30 − − deg Viewing angle (1) Definition θ and φ Conditions K >1.4, φ=0° K >1.4, θ=10° (2) Definition of viewing angles θ1 and θ2 Z (φ=0°) θ2' Contrast ratio Viewing direction 12 o'clock θ2 θ1' θ1 Y (φ=180°) X' 1.4 X θ1 θ2 Viewing angle Y' (φ=180°) Viewing direction 6 o'clock Fig.2 (3) Definition of contrast ratio "K" Fig.3 (4) Definition of optical response Selected 10% B1 Non-selected 100% B2 90% Brightness (%) K=B2 / B1 100 Selected condition 0 tr Driving voltage Fig.4 td Rise time Fall time Fig.5 3/7 RCM2228R-A / B Liquid Crystal Displays zTerminal function Symbol I / O Terminal VDD Input Function VSS Input VSS=0V V0 Input LCD driving voltage input terminal VDD ≥ V0 ≥ VSS DB4∼DB7 Input / Output VDD=4.75∼5.25V Data bus four-state bi-directional RS Input Register selected signal L: Instruction register (at write) L: Busy flag / address counter (at read) H: Data register (at write & read) R/W Input Read / Write select signal L: Write H : Read E Input Data Read / Write enable signal zTiming chart Writing RS R/W tAW6 tAH6 CSB tCYC6 tEWH tEWL E tr tf tDS6 tDH6 D0 to D7 (Write) tACC6 tOH6 D0 to D7 (Read) Fig.6 interface (Write Operation) Item Terminal Symbol Min. Max. Address hold time RS tAH6 20 − Address set up time RS tAW6 20 − Unit ns RS tCYC6 150 − ns Data setup time D0 to D7 tDS6 80 − ns Data hold time D0 to D7 tDH6 20 − ns Access time D0 to D7 tACC6 − 400 ns Output disable time D0 to D7 tOH6 150 − ns “E” rise / fall time E tr, tf − 20 ns “E” pulse width H level E tEWH 120 − ns “E” pulse width L level E tEWL 30 − ns System cycle time ∗ In designing, please set the timing with sufficient margin 4/7 RCM2228R-A / B Liquid Crystal Displays zInstruction Instruction Code Description Instruction RS RW D7 D6 D5 D4 D3 D2 D1 D0 Time (MAX) Display Clear 0 0 0 0 0 0 0 0 0 1 Clears entire display and sets DDRAM address 0 in address counter. 1.08ms Cursor Home 0 0 0 0 0 0 0 0 1 ∗ Sets DDRAM address 0 in the address counter Shifted display returns to the original state. DDRAM data does not change. 1.08ms 1 I/D S 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. 26.3µs D B 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) 26.3µs ∗ ∗ 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) 26.3µs ∗ ∗ Entry Mode Set Display ON / OFF Control 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 S/C R/L C Cursor or Display Shift 0 0 0 0 0 Function Set 0 0 0 0 1 CGRAM Address set 0 0 0 1 DDRAM Address set 0 0 1 Busy flag Address counter read 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. Data write 1 0 D7 D6 D5 D4 D3 D2 D1 D0 Writes data into DD / CGRAM Data read 1 1 D7 D6 D5 D4 D3 D2 D1 D0 Read data from DD / CGRAM DL N ∗ Sets function for the internal operation DL : (1:8bit , 0:4bit) N : (1:2line , 0:1line) 26.3µs A5 A4 A3 A2 A1 A0 Assigns the CGRAM address 26.3µs A6 A5 A4 A3 A2 A1 A0 Assigns the DDRAM address 26.3µs Note: Refer to Instruction table for the list of each instruction execution time. 0µs 26.3µs 26.3µs ( ∗ : don't care ) 5/7 RCM2228R-A / B Liquid Crystal Displays zCharacter code and corresponding character pattern UPPER 0000 0001 0010 0011 0100 0101 0110 0111 1000 1001 1010 1011 1100 1101 1110 1111 LOWER 0000 CGRAM (1) 0001 (2) 0010 (3) 0011 (4) 0100 (5) 0101 (6) 0110 (7) 0111 (8) 1000 (1) 1001 (2) 1010 (3) 1011 (4) 1100 (5) 1101 (6) 1110 (7) 1111 (8) 6/7 RCM2228R-A / B Liquid Crystal Displays zOperation 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