深入解析NHD-0220GZ-FL-GBW字符液晶顯示模塊
在電子設(shè)備開發(fā)中,液晶顯示模塊是信息交互的重要組件。今天為大家詳細(xì)介紹Newhaven Display推出的NHD - 0220GZ - FL - GBW字符液晶顯示模塊,探討其功能特性、技術(shù)參數(shù)及使用要點(diǎn)。
一、產(chǎn)品概述
NHD - 0220GZ - FL - GBW是一款2行×20字符的液晶顯示模塊。型號(hào)中各部分有其特定含義,“0220”代表2行×20字符,“GZ”是型號(hào)標(biāo)識(shí),“F”表示半透反射型,“L - G - B - W”表示黃綠LED背光源的STN正性顯示,擁有6:00最佳視角和寬溫度范圍,且符合RoHS標(biāo)準(zhǔn)。
二、功能與特性
2.1 顯示規(guī)格
該模塊具備2行×20字符的顯示能力,能清晰展示所需信息,滿足一般設(shè)備的顯示需求。
2.2 內(nèi)置控制器
內(nèi)置ST7066U控制器,可通過此鏈接下載其詳細(xì)規(guī)格說明。
2.3 電源要求
采用+5.0V電源供電,方便與常見的電子系統(tǒng)集成。
2.4 電氣特性
具有1/16 duty、1/5 bias的特性,并且符合RoHS標(biāo)準(zhǔn),環(huán)保且性能穩(wěn)定。
三、機(jī)械與引腳信息
3.1 機(jī)械繪圖
機(jī)械繪圖信息屬于Newhaven Display International, Inc.的專有財(cái)產(chǎn),未經(jīng)許可不得復(fù)制、再現(xiàn)和披露。
3.2 引腳描述
| Pin No. | Symbol | External Connection | Function Description |
|---|---|---|---|
| 1 | VSS | Power Supply | Ground |
| 2 | VDD | Power Supply | Supply Voltage for logic (+5.0V) |
| 3 | V0 | Adj. Power Supply | Supply Voltage for contrast (approx. 0.5V) |
| 4 | RS | MPU | Register Select signal. RS = 0: Command, RS = 1: Data |
| 5 | R/W | MPU | Read/Write select signal, R/W = 1: Read R/W = 0: Write |
| 6 | E | MPU | Operation Enable signal. Falling edge triggered. |
| 7 - 10 | DB0 – DB3 | MPU | Four low order bi - directional three - state data bus lines. These four are not used during 4 - bit operation. |
| 11 - 14 | DB4 – DB7 | MPU | Four high order bi - directional three - state data bus lines. |
| 15 | LED+ | Power Supply | Backlight Anode (+5.0V via on - board resistor) |
| 16 | LED - | Power Supply | Backlight Cathode (Ground) |
推薦使用2.54mm間距的引腳作為LCD連接器,不過文檔未提及背光源連接器的匹配信息。
四、電氣與光學(xué)特性
4.1 電氣特性
| Item | Symbol | Condition | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|---|---|
| Operating Temperature Range | T OP | Absolute Max | - 20 | - | +70 | ?C |
| Storage Temperature Range | T ST | Absolute Max | - 30 | - | +80 | ?C |
| Supply Voltage | V DD | - | 4.7 | 5.0 | 5.3 | V |
| Supply Current | I DD | V DD = 5.0V | 0.5 | 1.5 | 2.5 | mA |
| Supply for LCD (contrast) | V LCD | T OP = 25°C | 4.3 | 4.5 | 4.7 | V |
| “H” Level input | V IH | - | 0.7 * V DD | - | V DD | V |
| “L” Level input | V IL | - | V SS | - | 0.6 | V |
| “H” Level output | V OH | - | 3.9 | - | V DD | V |
| “L” Level output | V OL | - | V SS | - | 0.4 | V |
| Backlight Supply Voltage | V LED | - | 4.8 | 5.0 | 5.2 | V |
| Backlight Supply Current | I LED | V LED = 5.0V | 110 | 130 | 150 | mA |
4.2 光學(xué)特性
| Item | Symbol | Condition | Min. | Typ. | Max. | Unit | ||
|---|---|---|---|---|---|---|---|---|
| Optimal Viewing Angles | Top | ?Y+ | CR ≥ 2 | - | 40 | - | ° | |
| Bottom | ?Y - | - | 60 | - | ° | |||
| Left | θX - | - | 60 | - | ° | |||
| Right | θX+ | - | 60 | - | ° | |||
| Contrast Ratio | CR | - | 2 | 5 | - | - | ||
| Response Time | Rise | T R | T OP = 25°C | - | 150 | 250 | ms | |
| Fall | T F | - | 200 | 300 | ms |
五、控制器與DDRAM地址
5.1 控制器信息
內(nèi)置ST7066U控制器,工程師可根據(jù)其規(guī)格進(jìn)行開發(fā)。
5.2 DDRAM地址
| DDRAM地址有特定的排列,如下所示: | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 12 | 13 | 14 | 16 | 17 | 18 | 19 | 20 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D | 0F | 10 | 11 | 12 | 13 | ||||||||||||
| 40 41 42 43 44 45 46 47 48 49 4A 4B 4C 4D | 4F | 50 | 51 | 52 | 53 |
六、指令表與時(shí)序特性
6.1 指令表
| 模塊提供多種指令,如清屏、返回主頁、設(shè)置顯示模式等,不同指令有不同的執(zhí)行時(shí)間,具體如下: | Instruction code | Instruction | Description | Execution time (fOSC = 270 KHZ) |
|---|---|---|---|---|
| 0 0 0 0 0 0 0 0 0 1 | Clear Display | Write “20H” to DDRAM and set DDRAM address to “00H” from AC | 1.52ms | |
| 0 0 0 0 0 0 0 0 1 | Home Return | Set DDRAM Address to “00H” from AC and return cursor to its original position if shifted. The contents of DDRAM are not changed. | 1.52ms | |
| 0 0 0 0 0 0 1 I/D SH | Entry mode Set | Sets cursor move direction and specifies display shift. These parameters are performed during data write and read. | 37μs | |
| 0 0 0 0 1 D C B | Display ON/ OFF control | D = 1: Entire display on; C = 1: Cursor on; B = 1: Blinking cursor on | 37μs | |
| 0 0 0 0 0 1 S/C R/L | Cursor or Display shift | Sets cursor moving and display shift control bit, and the direction without changing DDRAM data. | 37μs | |
| 0 0 0 0 1 DL N F | Function set | DL: Interface data is 8/4 bits; N: Number of lines is 2/1; F: Font size is 5x11/5x8 | 37μs | |
| 0 0 0 1 | CGRAM address counter | Set CGRAM address | 37μs | |
| 0 0 1 | DDRAM address counter | Set DDRAM address | 37μs | |
| 0 1 BF | Flag and Read busy | Whether during internal operation or not can be known by reading BF. The contents of address counter can also be read. | 0s | |
| 1 0 D7 D6 D5 D4 D3 D2 D1 D0 | Write data To Address | Write data into internal RAM (DDRAM/CGRAM). | 37μs | |
| 1 1 D7 D6 D5 D4 D3 D2 D1 D0 | From RAM Read data | Read data from internal RAM (DDRAM/CGRAM). | 37μs |
6.2 時(shí)序特性
寫入數(shù)據(jù)
從MPU向ST7066U寫入數(shù)據(jù)時(shí),各信號(hào)有特定的時(shí)序要求,如Enable Cycle Time(Tc)為1200 ns,Enable Pulse Width(Tpw)為140 ns等。
讀取數(shù)據(jù)
從ST7066U向MPU讀取數(shù)據(jù)時(shí),同樣有相應(yīng)的時(shí)序參數(shù),如Data Setup Time(TDDR)為100 ns等。
七、初始化程序
7.1 8位初始化
通過一系列指令實(shí)現(xiàn)模塊的8位初始化,包括喚醒、設(shè)置功能、顯示模式等。
7.2 4位初始化
對于4位接口,也有相應(yīng)的初始化程序,同樣包含喚醒、功能設(shè)置等步驟。
八、質(zhì)量與使用注意事項(xiàng)
8.1 質(zhì)量測試
模塊經(jīng)過多種質(zhì)量測試,如高溫存儲(chǔ)、低溫存儲(chǔ)、高溫操作、低溫操作、高溫高濕操作、熱沖擊抵抗、振動(dòng)測試和靜電測試等,確保其在不同環(huán)境下的可靠性。
8.2 使用注意事項(xiàng)
使用LCDs/LCMs時(shí),可參考此鏈接獲取詳細(xì)的預(yù)防措施。同時(shí),關(guān)于保修信息和條款可查看此鏈接。
NHD - 0220GZ - FL - GBW字符液晶顯示模塊以其豐富的功能、穩(wěn)定的性能和良好的兼容性,在電子設(shè)備顯示領(lǐng)域具有廣泛的應(yīng)用前景。工程師在使用過程中,需根據(jù)其特性合理設(shè)計(jì)電路和編寫程序,以充分發(fā)揮其優(yōu)勢。大家在實(shí)際應(yīng)用中遇到過哪些問題呢?歡迎在評(píng)論區(qū)分享交流。
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深入解析NHD-0220GZ-FL-GBW字符液晶顯示模塊
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