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RCM2228R-A中文资料

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.

z Applications

Printers, Copiers, Facsimiles, etc

z Features

(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.

z External dimensions (Unit : mm) (Viewing direction : 6 : 00)

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Liquid Crystal Displays

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z Block diagram

Pin assignments

Symbol Symbol Pin No.12345

Pin No.RS R / W 6DB6E 7DB7DB48V SS DB5

9V DD 10

V 0

z Power supply example

z Absolute maximum ratings (T a=25°C)

Parameter

Min.?0.3?0.3?0.30Symbol

V DD V LCD V IN Topr Tstg

Max.6.06.0

V DD +0.35070

Unit V V V

°C °C

?20

Power voltage for logics Power voltage for driving LCD Input voltage

Operating temperature Storage temperature

Liquid Crystal Displays

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z Electrical characteristics (V DD =5.0V , T a=25°C)

Parameter

Symbol V DD

V LCD V IH V IL fosc

Min.4.753.00.7V DD V SS ?0.3

0.75V DD Typ.5.00.5

Max.5.255.0V DD

0.60.2V DD 1.0

1100Unit V V V V V V mA

Conditions

V DD =5.0V, fosc=270kHz check pattem

RS, R / W, CS ?

?????V SS kHz 540350?

Logic power voltage LCD driving voltage "H" input voltage "L" input voltage "H" output voltage "L" output voltage Clock frequency Current consumption

IOH = ?0.1mA IOL =0.1mA

V OH V OL I DD

z Optical characteristics (T a=25°C) When viewing from below

Liquid Crystal Displays

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z Terminal function

V DD V SS DB4～DB7

RS E

R / W V 0Symbol Input Input Input / Output

Input

Input Input I / O Terminal

Function

V DD =4.75～5.25V V SS =0V

LCD driving voltage input terminal V DD ≥ V 0 ≥ V SS 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

z Timing chart Writing

RS R / W

CSB

D0 to D7(Write)

D0 to D7(Read)

Fig.6 interface (Write Operation)

Item

Terminal Min.Max.Unit 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

RS RS RS D0 to D7D0 to D7D0 to D7D0 to D7

E E E

Symbol t AH6t AW6t CYC6t DS6t DH6t ACC6t OH6t r , t f t EWH t EWL

ns ns ns ns ns ns ns ns ns

?????400?20??

20201508020?150?12030

Liquid Crystal Displays

5/7

z Instruction

Instruction Display Clear

1.08ms

26.3μs

26.3μs 26.3μs

26.3μs 26.3μs 0μs 0

RS 0

RW 0

D70

D60

D50

D40

D30

D20

D11

D0Instruction Code

Description

Time (MAX)

Cursor Home 000000001?Entry Mode Set 00000001I /

D S Display ON / OFF Control

0000001D C B

Cursor or Display Shift 00000

1S / C R /

L ??

Function Set 00001DL N ???

CGRAM Address set 0001Busy flag

Address counter read Data write Data read

A5A4A3A2A1A0DDRAM Address set 001

A6A5A4A3A2A1A00

BF A6A5A4A3A2A1A010D7D6D5D4D3D2D1D01

D7D6D5D4D3D2D1D0Clears entire display and sets DDRAM address 0 in address counter.

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)

Assigns the CGRAM address

Assigns the DDRAM address

Writes data into DD / CGRAM Read data from DD / CGRAM

BF: Reads the internal operation state

(1: In operation, 0: Completed operation)

AC: Reads the address counter value.

Sets DDRAM address 0 in the address counter Shifted display returns to the original state.

DDRAM data does not change.

Note: Refer to Instruction table for the list of each instruction execution time.

( ? : don't care )

Liquid Crystal Displays

z Character code and corresponding character pattern

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Liquid Crystal Displays

z 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.

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Appendix

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