Newhaven Display NHD字符液晶显示模块产品解析

在电子设备的设计中，液晶显示模块是不可或缺的一部分，它为用户提供了直观的信息展示界面。今天，我们就来详细了解一下Newhaven Display的NHD字符液晶显示模块，看看它有哪些特点和优势。

文件下载：NHD-0108FZ-RN-YBW.pdf

一、产品概述

Newhaven Display的NHD字符液晶显示模块具有1行8字符的显示能力，内置ST7066U控制器，采用+5.0V电源供电，具备1/16 duty、1/4 bias的驱动特性，并且符合RoHS标准，环保可靠。

很遗憾，在搜索ST7066U控制器的特点和优势时出现网络超时问题，未能获取到相关内容。不过我们可以继续依据文档对NHD字符液晶显示模块展开介绍。

二、机械与引脚信息

1. 机械绘图

该模块的机械绘图包含了详细的尺寸信息，标准公差为线性±0.3mm。其显示模式为STN正性、黄绿、半透反射，最佳视角为6:00方向。驱动IC为ST7066U，具备8/4 - Bit MPU接口。

2. 引脚分配与描述

Pin No.	Symbol	External Connection	Function Description
1	VSS	Power Supply	Ground
2	VDD	Power Supply	Supply Voltage for LCD and Logic (+5.0V)
3	V0	Adj. Power Supply	Supply Voltage for Contrast (approx. +0.6V)
4	RS	MPU	Register Select signal: ‘0’ = Command, ‘1’ = Data
5	R/W	MPU	Read/Write select signal: ‘1’ = Read, ‘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. Not used during 4 - bit operation.
11 - 14	DB4 – DB7	MPU	Four high order bi - directional three - state data bus lines.
15	NC	-	No Connect
16	NC	-	No Connect

推荐使用2.54mm间距的引脚作为LCD连接器。

三、电气与光学特性

1. 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	-	4.8	5.0	5.2	V
Supply Current	IDD	VDD = 5.0V	0.5	1.5	2	mA
Supply for LCD (contrast)	VDD - V0	TOP = 25°C	4.2	4.4	4.6	V
“H” Level input	VIH	-	0.7 * VDD	-	VDD	V
“L” Level input	VIL	-	VSS	-	0.6	V
“H” Level output	VOH	-	3.9	-	VDD	V
“L” Level output	VOL	-	VSS	-	0.4	V

2. 光学特性

Item	Symbol	Condition	Min.	Typ.	Max.	Unit
Optimal Viewing Angles (Top)	ϕY+	CR ≥ 2	-	40	-	°
Optimal Viewing Angles (Bottom)	ϕY -	-	60	-	°
Optimal Viewing Angles (Left)	θX -	-	60	-	°
Optimal Viewing Angles (Right)	θX+	-	60	-	°
Contrast Ratio	CR	-	2	5	-	-
Response Time (Rise)	TR	TOP = 25°C	-	150	250	ms
Response Time (Fall)	TF	-	200	300	ms

四、指令与时序特性

1. 指令表

模块提供了一系列指令，用于控制显示、光标、数据读写等操作。例如，Clear Display指令可将“20H”写入DDRAM并将DDRAM地址设置为“00H”，执行时间为1.52ms；Entry mode Set指令可设置光标移动方向和显示移位，执行时间为37µs。

2. 时序特性

在数据读写操作中，有明确的时序要求。如在MPU向ST7066U写入数据时，Enable Cycle Time（Tc）要求为1200ns，Enable Pulse Width（TPW）为140ns等；在从ST7066U向MPU读取数据时，也有相应的时序参数。

五、初始化程序示例

1. 8 - bit初始化

void command(char i)
{
    P1 = i; D1 = 0; //put data on output Port //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; DI = 1; R_W = 0; //put data on output Port //D/l=HIGH: send data //R/W=LOW: Write
    E = 1;
    Delay(1); //enable pulse width >= 300ns
    E = 0; //Clock enable: falling edge
}

void init()
{
    E = 0; Delay(100); command(0x30); //Wait >40 msec after power is applied //command 0x30 = Wake up
    Delay(30); //must wait 5ms, busy flag not available
    command(0x30); //command 0x30 = Wake up #2
    Delay(10); command(0x30); //must wait 160us, busy flag not available //command 0x30 = Wake up #3
    Delay(10); command(0x38); command(0x10); command(0x0c); command(0x06); //Set cursor //must wait 160us, busy flag not available //Function set: 8 - bit/2 - line //Display ON; Cursor ON //Entry mode set
}

2. 4 - bit初始化

void command(char i)
{
    P1 = i; D1 = 0; //put data on output Port /D/I=LOW: send instruction
    i = i < < 4; R_W = 0; Nybble(); //Send Upper 4 bits //R/W=LOW: Write //Shift over by 4 bits
    P1 = i; Nybble(); //put data on output Port //Send Lower 4 bits
}

void write(char i)
{
    P1 = i; DI = 1; R_W = 0; //put data on output Port //D/l=HIGH: send data //R/W=LOW: Write
    Nybble(); //Clock Upper 4 bits
    i = i < < 4; //Shift over by 4bits
    P1 = i; //put data on output Port
    Nybble(); //Clock Lower 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); P1 = 0x30; //Wait >40 msec after power is applied //put 0x30 on the output port
    Delay(30); Nybble(); //must wait 5ms, busy flag not available //command 0x30 = Wake up
    Nybble(); P1 = 0x20; command(0x06); command(0x0F); Delay(10); command(0x10); Nybble(); command(0x28); Delay(10); Nybble(); Delay(10); //put 0x20 on the output port //can check busy flag now instead of delay //Function set: 4 - bit interface //command 0x30 = Wake up #3 //Function set: 4 - bit/2 - line //must wait 160us, busy flag not available //Set cursor //Display ON; Blinking cursor //command 0x30 = Wake up #2 //must wait 160us, busy flag not available //Entry Mode set
}

六、质量信息

该模块经过了多项质量测试，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小时等。

对于电子工程师来说，在设计使用该模块时，需要充分考虑其各项特性和参数，以确保系统的稳定性和可靠性。大家在实际应用中是否遇到过类似模块的使用问题呢？不妨在评论区分享一下。