电子说
在电子设备开发中,液晶显示模块是信息交互的重要组件。今天为大家详细介绍Newhaven Display推出的NHD - 0220GZ - FL - GBW字符液晶显示模块,探讨其功能特性、技术参数及使用要点。
NHD - 0220GZ - FL - GBW是一款2行×20字符的液晶显示模块。型号中各部分有其特定含义,“0220”代表2行×20字符,“GZ”是型号标识,“F”表示半透反射型,“L - G - B - W”表示黄绿LED背光源的STN正性显示,拥有6:00最佳视角和宽温度范围,且符合RoHS标准。
该模块具备2行×20字符的显示能力,能清晰展示所需信息,满足一般设备的显示需求。
内置ST7066U控制器,可通过此链接下载其详细规格说明。
采用+5.0V电源供电,方便与常见的电子系统集成。
具有1/16 duty、1/5 bias的特性,并且符合RoHS标准,环保且性能稳定。
机械绘图信息属于Newhaven Display International, Inc.的专有财产,未经许可不得复制、再现和披露。
| 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) |
推荐使用2.54mm间距的引脚作为LCD连接器,不过文档未提及背光源连接器的匹配信息。
| Item | Symbol | Condition | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|---|---|
| Operating Temperature Range | T OP | Absolute Max | - 20 | - | +70 | ⁰C |
| Storage Temperature Range | T ST | Absolute Max | - 30 | - | +80 | ⁰C |
| 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 |
| Item | Symbol | Condition | Min. | Typ. | Max. | Unit | ||
|---|---|---|---|---|---|---|---|---|
| Optimal Viewing Angles | Top | ϕY+ | CR ≥ 2 | - | 40 | - | ° | |
| Bottom | ϕY - | - | 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 |
内置ST7066U控制器,工程师可根据其规格进行开发。
| 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 |
| 模块提供多种指令,如清屏、返回主页、设置显示模式等,不同指令有不同的执行时间,具体如下: | 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 |
从MPU向ST7066U写入数据时,各信号有特定的时序要求,如Enable Cycle Time(Tc)为1200 ns,Enable Pulse Width(Tpw)为140 ns等。
从ST7066U向MPU读取数据时,同样有相应的时序参数,如Data Setup Time(TDDR)为100 ns等。
通过一系列指令实现模块的8位初始化,包括唤醒、设置功能、显示模式等。
对于4位接口,也有相应的初始化程序,同样包含唤醒、功能设置等步骤。
模块经过多种质量测试,如高温存储、低温存储、高温操作、低温操作、高温高湿操作、热冲击抵抗、振动测试和静电测试等,确保其在不同环境下的可靠性。
使用LCDs/LCMs时,可参考此链接获取详细的预防措施。同时,关于保修信息和条款可查看此链接。
NHD - 0220GZ - FL - GBW字符液晶显示模块以其丰富的功能、稳定的性能和良好的兼容性,在电子设备显示领域具有广泛的应用前景。工程师在使用过程中,需根据其特性合理设计电路和编写程序,以充分发挥其优势。大家在实际应用中遇到过哪些问题呢?欢迎在评论区分享交流。
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