6DD1640-0AH0

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6DD1640-0AH0

 温度采集单元的实现
温度采集单元主要温度信号的实时采样并响应主机的命令[31。本系统温度传感器使用DS1 8B20，DS1 8B28B20是美国半导体DALLAS公司推出的单总线温度传感器。该器件具有体积小、结构简单、实用电压宽、可组网、成本低廉、便于总线扩展和维护等诸多优点，而且内有控制电路，收发电路和存储电路等。DS18B20 具有较宽的电压适用范围(3～5．5V)，并能够通过编程实现温度信号的9～12位的数字转换，分辨率zui高可以达到0．0625℃。其测量温度范围为-55～+125℃，其中，在-10～+85℃范围内，精度能够达到±0．5℃。器件采用CMOS技术，耗电量很小，能够直接读出被测温度并且可根据实际要求通过简单的编程实现一位分辨率的数字值读数方式。使用微处理器作为控制机时，可以使用一位普通端口，就可驱动传感器芯片，本系统采用GPB7引脚来驱动DS18B20。由于DS1 8B20是通过一条数据线传输数据， 这样整个系统要严格按该器件单总线协议规定的时序进行工作， 所以DS 1 8B20有严格的通信协议来保证各个数据传输的正确性和完整性。根据DS 1 8B20的通讯协议，主机控制DS 1 8B20完成温度转换时，首先在每一次读写之前对DS1 8B20进行复位，复位成功后发送一条ROM指令，然后发送RAM 指令，这样才能对DS18B20进行预定的操作。R O M 操作命令主要是对传感器地址的操作。RAM 指令主要完成温度的测量，主要有读寄存器，写寄存器，温度转换等操作。

2．4 键盘及LCD显示单元
系统采用SPI接口的键盘控制芯片ZLG 72 8与$3C2410A的SPI接口连接，ZLG7289扫描的行线R[2：0】和列线C[7：0】构成矩阵键盘，同时在芯片内部可自动完成扫描、译码、去抖动处理等任务。

S3C2410A内部已经集成了LCD 控制器，因此可以很方便地控制各种类型的LCD屏，例如：STN和TFT屏。系统采用Samsung 3．5 反射型TFT液晶LTS350Q1，320 X 240像素，256k色，White LED背光，自带四线式触摸屏，可以直接和S3C2410A的触摸屏驱动电路连接，触摸位置直接用CPU内置的ADC电路采样可得。
键盘和LCD连接示意图如图2所示。

HP Agilent G2597-65648 aMH Power Supply

HP Agilent 8514B S-Parameter Test Set OPT:002 45MHz-20GHz 3.5mm for 8510C

BOC Edwards Turbomolecular Turbo Pump EXT 75DX (NXE997000) EXT75DX

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Scientific Software Inc. Agilent SS420x Client / Server Enterprise Data System

Belden 19206 12AWG 3COND 250 Ft Unshielded Cable

Bausch & Lomb High Power Stereoviewer Microscope w/ Wild Optics Camera & Monitor

Oxford NMR Apparatus with Leybold Coolpower 130 Omega FMA1828 MFC & Probe

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C Technologies R-3545 Cassini 12 12-Channel Fiber Optic Dissolution Module

Inficon Leybold Heraeus 012-214 RF Unit with 155-37 Head, Heater & Cables

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