RCM2234R-A / B Liquid Crystal Displays 20 characters × 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 × 2 lines. zApplications Printers, Copiers, Facsimiles, etc zFeatures (1) 5×7 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. zExternal dimensions (Unit : mm) (Viewing direction : 6 : 00) (0.5) ±5° 6.0MAX. 6.0MAX. 0.7±0.7 0.7±0.7 0.7±0.7 0.7±0.7 81.0±0.3 79.0MIN. ±5° (0.3) 4.0MAX. 0.7±0.7 g win n Vie ectio ) dir :00 (6 0.7±0.7 (73.5) 3.75±0.3 26.3MIN. 10.0MAX. (11.5) 2.0MAX. 8.7±0.7 1.5MAX. Over-coating resin 12.5±0.3 No.15 No.1 10.15MIN. 23.15MAX. 13.15MIN. 10.6±0.5 (PITCH1.8×14)25.2±0.3 24.9±0.3 0.6 0.5 1.1±0.1 1.1±0.1 5.55 0.05 0.65 2.7±0.3 3.2 0.05 0.4 28.3±0.3 26.15MAX. (20.3) 8.0±0.3 0.3MAX. 0.7±0.7 1.0MAX. Dot detail 1/8 RCM2234R-A / B Liquid Crystal Displays zBlock diagram VR V V V R R E D D G S L D S / B ot B N S C D D W 0 7 D I SEG1 to 100 COM 1 to 8 20characters×2lines 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 : 10kΩ to 20kΩ (variable) zPin assignments Pin No. symbol Pin No. symbol 1 VSS 9 DB2 2 VLCDI 10 DB3 3 VDD 11 DB4 4 RS 12 DB5 5 R/W 13 DB6 6 E 14 DB7 7 DB0 15 GND 8 DB1 zAbsolute maximum ratings (Ta=25°C) Symbol Min. Max. Unit Notes Power voltage (1) Parameter VDD −0.3 7.0 V − Power voltage (2) VLCDI −0.3 12.0 V − VIN −0.3 VDD+0.3 V Input terminal Operation temperature Topr 0 50 °C − Storage temperature Tstg −20 70 °C − Input voltage 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 zElectrical characteristics (VDD=5.0V, Ta=25°C) Min. Typ. Max. Unit Logic power voltage Parameter VDD 4.75 5.0 5.25 V LCD power voltage VLCDI 3.0 − 5.0 H input voltage (1) VIH E, RS, SEL1, 0.7VDD − VDD V L input voltage (2) VIL DB0 to DB7 VSS − 0.7 V H output voltage VOH 0.8VDD − − V IOH= −100µA L output voltage VOL − − 0.2VDD V IOL=100µA Clock oscillation frequency fosc 175 250 325 kHz LCD driving voltage VLCD 3.0 − 5.0 V Current consumption IDD − 700 1400 µA Symbol Terminal Name DB0 to DB7 VDD Conditions LCD drive resistance Check pattern zOptical characteristics (Ta=25°C) (1) Viewing direction 6:00 Symbol Min. Typ. Max. Unit tr − 100 250 ms θ=10°, φ=0° Response time td − 150 250 ms θ=10°, φ=0° Contrast ratio K − 3 − − θ=10°, φ=0° θ1 − − 0 θ2 − − deg 20 K 1.2 φ=0° φ ±30 − − deg K 1.2 θ=20° Symbol Min. Typ. Max. Unit Response time tr − 100 250 ms θ'=10°, φ=180° Response time td − 150 250 ms θ'=10°, φ=180° − θ'=10°, φ=180° Parameter Response time Viewing angle Test Conditions (2) Viewing direction 12:00 Parameter Contrast ratio Viewing angle K − 3 − θ 1' − − 0 θ 2' 20 − − φ 150 to 210 − − Test Conditions deg K 1.2 φ=180° deg K 1.2 θ'=20° 3/8 RCM2234R-A / B Liquid Crystal Displays (1) Definition θ and φ (2) Definition of viewing angles θ1 and θ2 θ2' Contrast ratio Z (φ=0°) θ2 θ1' θ1 Viewing direction 12 o'clock Y (φ=180°) X' 1.2 X θ2 θ1 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 B1 10% Non-selected 100% B2 90% Brightness (%) K=B2 / B1 100 Selected condition 0 tr Driving voltage td Rise time Fig.4 Fall time Fig.5 zTerminal function Symbol I/O Terminal Function VSS=0V VSS Input VLCDI Input LCD driving voltage input terminal 3.0 VDD Input VDD=4.75 to 5.25V RS Input Register selected signal L: Instruction register (at write) 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 DB0 to DB3 Input / Output Data bus four-state bi-directional DB4 to DB7 Input / Output Data bus four-state bi-directional VLCDI 5.0 4/8 RCM2234R-A / B Liquid Crystal Displays zTiming characteristics Write operation vIH vIL RS R/W vIH vIL tAS tAH tWL tWH vIH E vIH vIL vIL tr tf tCYC tDS vIH vIL D0 to D7 tDH write data vIH vIL tCH tACC vOH vOL D0 to D7 read data vOH vOL Fig.6 Symbol Item Min. Typ. Max. Unit Condition 120 ⎯ ⎯ ns at write at read Address set up time tAS 120 ⎯ ⎯ ns Address hold time tAH 20 ⎯ ⎯ ns "E" pulse width H level tWH 500 ⎯ ⎯ ns "E" pulse width L level tWL 500 ⎯ ⎯ ns Cycle time tCYC 1000 ⎯ ⎯ ns Data setup time tDS 200 ⎯ ⎯ ns Data hold time tDH 20 ⎯ ⎯ ns Output disable time tACC ⎯ ⎯ 95 ns Output data hold time tCH 40 ⎯ ⎯ ns "E" rise / fall time tr, tf ⎯ ⎯ 10 ns ∗ Numbers above mentioned are driver IC's number as a single unit. In designing, please set the timing with sufficient margin. zReset 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. Symbol Min. Typ. Max. Unit Condition Power rise time Item trDD 0.1 − 10 ms − Power OFF time tOFF 1 − − ms − 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 trDD 0.2V tOFF 5/8 RCM2234R-A / B Liquid Crystal Displays zInstruction Instruction code Instruction Description 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. 3.3ms 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. 3.3ms 80µs Entry Mode Set 0 0 0 0 0 0 0 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 operation are performed during data write and read. Display ON / OFF Control 0 0 0 0 0 0 1 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) 80µs ∗ ∗ 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) 80µs ∗ ∗ Sets function for the internal operation DL : (1:8bit, 0:4bit) N : (1:2line, 0:1line) 80µs Assigns the CGRAM address 80µs Assigns the DDRAM address 80µs 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 ADD Busy flag Address counter read 0 1 BF AC Data write 1 0 Write data Writes data into DD / CGRAM 80µs Data read 1 1 Read data Read data from DD / CGRAM 80µs DL N ∗ ACG 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 BF : Reads the internal operation state (1 : In operation, 0 : Completed operation) AC : Reads the address counter value. − (∗ : Don't care) 6/8 RCM2234R-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) 7/8 RCM2234R-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. 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