探索NHD - 0216CZ - FL - YBW字符液晶显示模块

在电子设计领域，液晶显示模块是人机交互的重要组成部分。今天我们来深入了解一下Newhaven Display International推出的NHD - 0216CZ - FL - YBW字符液晶显示模块，看看它有哪些特性和应用要点。

文件下载：NHD-0216CZ-FL-YBW.pdf

一、产品概述

NHD - 0216CZ - FL - YBW是一款具备特定功能和特性的字符液晶显示模块。从型号上我们可以解读出很多信息：

• “NHD - ”代表Newhaven Display；
• “0216 - ”表示该模块有2行，每行可显示16个字符；
• “CZ - ”是具体的型号；
• “F - ”代表半透反射类型；
• “L - ”表示采用黄/绿色LED背光；
• “Y - ”为STN - 黄/绿色；
• “B - ”表示6:00视角；
• “W - ”意味着具备宽温度范围（ - 20°C ~ +70°C），并且该产品符合RoHS标准。

二、功能与特性

显示能力

该模块可显示2行，每行16个字符，能满足一般的信息显示需求。

内置控制器

内置SPLC780D或ST7066U控制器，相关规格可分别从http://www.newhavendisplay.com/app_notes/SPLC780D.pdf和http://www.newhavendisplay.com/app_notes/ST7066U.pdf下载。

电源要求

采用 +5.0V电源供电，具有1/16 duty和1/5 bias的特性，并且符合RoHS标准。

三、机械与电气特性

引脚说明

Pin No.	Symbol	External Connection	Function Description
1	VDD	Power Supply	Supply Voltage for logic (+5.0V)
2	V0	Adj Power Supply	Power supply for contrast (approx. 0.5V)
3	RS	MPU	Register select signal. RS = 0: Command, RS = 1: Data
4	R/W	MPU	Read/Write select signal, R/W = 1: Read R/W: = 0: Write
5	E	MPU	Operation enable signal. Falling edge triggered.
6 - 9	DB0 – DB3	MPU	Four low order bi - directional three - state data bus lines. These four are not used during 4 - bit operation.
10 - 13	DB4 – DB7	MPU	Four high order bi - directional three - state data bus lines.
14	VSS	Power Supply	Ground
A	LED+	Power Supply	Power supply for LED Backlight (+4.2V)
K	LED -	Power Supply	Ground for Backlight

推荐使用1.0mm间距的引脚作为LCD连接器。

电气特性

Item	Symbol	Condition	Min.	Typ.	Max.	Unit
Operating Temperature Range	Top	Absolute Max	- 20	-	+70	⁰C
Storage Temperature Range	Tst	Absolute Max	- 30	-	+80	⁰C
Supply Voltage	VDD		4.7	5.0	5.5	V
Supply Current	IDD	Ta = 25°C, VDD = 5.0V	-	1.5	2.5	mA
Supply for LCD (contrast)	VDD - V0	Ta = 25°C	-	4.5	-	V
“H” Level input	Vih		2.2	-	VDD	V
“L” Level input	Vil		0	-	0.6	V
“H” Level output	Voh		2.4	-	-	V
“L” Level output	Vol		-	-	0.4	V
Backlight Supply Voltage	Vled	-	-	4.2		V
Backlight Supply Current	Iled	Vled = 4.2V	-	120	160	mA

光学特性

Item	Symbol	Condition	Min.	Typ.	Max.	Unit
Viewing Angle – Vertical (top)	AV	Cr ≥2	-	25	-	⁰
Viewing Angle – Vertical (bottom)	AV	Cr ≥2	-	70	-	⁰
Viewing Angle – Horizontal (left)	AH	Cr ≥2	-	30	-	⁰
Viewing Angle – Horizontal (right)	AH	Cr ≥2	-	30	-	⁰
Contrast Ratio	Cr		-	2	-	-
Response Time (rise)	Tr	-	-	120	150	ms
Response Time (fall)	Tf	-	-	120	150	ms

四、初始化程序

8位初始化

/**********************************************************/ 
void command(char i) 
{
    P1 = i; //put data on output Port 
    D_I = 0; //D/I = LOW : send instruction 
    R_W = 0; //R/W = LOW : Write 
    E = 1;
    Delay(1); //enable pulse width >= 300ns 
    E = 0; //Clock enable: falling edge 
}

void write(char i) 
{ 
    P1 = i; //put data on output Port 
    D_I = 1; //D/I = HIGH : send data 
    R_W = 0; //R/W = LOW: Write
    E = 1; 
    Delay(1); //enable pulse width >= 300ns 
    E = 0; //Clock enable: falling edge 
}

void init() 
{ 
    E = 0; 
    Delay(100); //Wait >15 msec after power is applied 
    command(0x30); //command 0x30 = Wake up 
    Delay(30); //must wait 5ms, busy flag not available 
    command(0x30); //command 0x30 = Wake up #2 
    Delay(10); //must wait 160us, busy flag not available 
    command(0x30); //command 0x30 = Wake up #3 
    Delay(10); //must wait 160us, busy flag not available 
    command(0x38); //Function set: 8 - bit/2 - line 
    command(0x0c); //Display ON; Cursor ON 
    command(0x06); //Entry mode set 
}
/**********************************************************/

4位初始化

void command(char i) 
{ 
    P1 = i; //put data on output Port 
    D_I = 0; //D/I = LOW : send instruction 
    R_W = 0; 
    Nybble(); //Send lower 4 bits 
    i = i < < 4; //Shift over by 4 bits 
    P1 = i; //put data on output Port 
    Nybble(); //Send upper 4 bits 
}

void write(char i) 
{
    P1 = i; //put data on output Port 
    D_I = 1; //D/I = HIGH : send data 
    R_W = 0; //R/W = LOW : Write 
    Nybble(); //Clock lower 4 bits 
    i = i < < 4; //Shift over by 4 bits 
    P1 = i; //put data on output Port 
    Nybble(); //Clock upper 4 bits 
} 

void Nybble() 
{
    E = 1; 
    Delay(1); //enable pulse width >= 300ns 
    E = 0; //Clock enable: falling edge 
}

void init() 
{
    P1 = 0; P3 = 0; 
    Delay(100); //Wait >15 msec after power is applied 
    P1 = 0x30; //put 0x30 on the output port 
    Delay(30); //must wait 5ms, busy flag not available 
    Nybble(); //command 0x30 = Wake up 
    Delay(10); //must wait 160us, busy flag not available 
    Nybble(); //command 0x30 = Wake up #2 
    Delay(10); //must wait 160us, busy flag not available 
    Nybble(); //command 0x30 = Wake up #3 
    Delay(10); //can check busy flag now instead of delay 
    P1 = 0x20; //put 0x20 on the output port 
    Nybble(); //Function set: 4 - bit interface 
    command(0x28); //Function set: 4 - bit/2 - line 
    command(0x10); //Set cursor
    command(0x0F); //Display ON; Blinking cursor 
    command(0x06); //Entry Mode set
}

五、质量与使用注意事项

质量测试

该模块经过了一系列严格的质量测试，包括高温存储、低温存储、高温运行、低温运行、高温高湿运行、热冲击抵抗、振动测试和静电测试等。例如，高温存储测试在 +80⁰C下进行48小时，低温存储测试在 - 30⁰C下进行48小时。

使用注意事项

使用LCD/LCM时，可参考www.newhavendisplay.com/specs/precautions.pdf中的注意事项。同时，关于保修信息和条款可查看http://www.newhavendisplay.com/index.php?main_page=terms 。

NHD - 0216CZ - FL - YBW字符液晶显示模块以其丰富的功能、良好的电气和光学特性，为电子工程师在设计人机交互界面时提供了一个可靠的选择。在实际应用中，我们需要根据具体需求合理使用该模块，并严格遵循相关的使用和测试要求。大家在使用过程中遇到过哪些问题呢？欢迎在评论区分享交流。