Liquid crystal displays 16 characters2 lines COG module RCM2090R The RCM2090R is a reflective TN type liquid crystal module with a built-in controller / driver LSI and a display capacity of 16 characters2 lines. Applications Printers, copiers, facsimiles, etc. Features 1) Wide viewing angle and high contrast. 2) 57 dot character matrix with cursor. 3) Interfaces with 4-bit MPUs. 4) Displays up to 237 characters and special symbols 5) Custom character patterns are displayed with the character RAM. 6) Abundant instruction set including clear display, cursor on / off, and character blinking. 7) Compact and lightweight for easy assembly to the host instrument. 8) Operable on single 5V power supply. 9) Low power consumption. External dimensions (Units: mm) 21 Liquid crystal displays FBlock diagram FPin assignments FPower supply example FAbsolute maximum ratings (Ta = 25_C) 22 RCM2090R Liquid crystal displays RCM2090R FElectrical characteristics (VDD = 5.0V±0.25 V, Ta = 25_C) FOptical characteristics (Ta = 25_C) When viewing from below 23 Liquid crystal displays Pin functions Timing chart (1) Writing 24 RCM2090R Liquid crystal displays (2) RCM2090R Reading 25 Liquid crystal displays Instructions (Example 1) When fosc = 270kHz 40µs 26 250 270 = 37µs RCM2090R Liquid crystal displays RCM2090R Character code and corresponding character pattern 27 Liquid crystal displays RCM2090R FReset function When you turn on the power supply, the module automatically returns to its initial (reset) settings. At the initial settings, the busy flag (BF) becomes “1.” The busy status last 10 ms from when VDD reaches 4.5V. At the initial settings, following instructions are carried out. (1) Clear display (2) Function set 8-bit interface data length (DL = 1) Two line display (N = 1) SEG signal transfer direction SEG1SEG50SEG51SEG100 (SD1 = 0, SD2 = 0) COM signal transfer direction COM1COM16 (CD = 0) (3) Display on / off control Display off (D = 0) Cursor off (C = 0) Blinking off (B = 0) (4) Entry mode set )1 (increment) (I / D = 1) No shift (S = 0) ∗ The internal reset circuit may not operate properly due to conditions with the power supply. If this is the case, use the appropriate instruction to reset the settings. FOperation notes (1) Handling precautions S Protect the module from strong shocks as they can cause damage or defective operation. S 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. S If the liquid crystal panel is damaged and liquid crystal contacts your clothing or body, wash immediately with soap and water. S If the module is to be used for long periods subjected to direct sunlight, employ a filter to block the ultraviolet rays. S Do not use the module in areas of high temperature or high humidity. Do not use the module in locations exposed to direct sunlight or fluorescent light. S 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 S Do not connect or disconnect the module while the power supply is turned on. S Input the input signal after the module power supply is turned on. When turning it off, turn off the input signal first. Otherwise the IC may be damaged by the latch-up phenomenon. 28 (3) Precautions during installation S Be sure to use a grounded soldering iron when performing any installation procedures. S 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 S 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 S Do not subject the front and back surfaces of the IC to light. Doing so may cause defective operation. S 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. S 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.