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1、一、系统总体设计框图图 1 系统总体框图在基于单片机的通用测控系统的设计中，选用了mcs-51 作为系统核心，外围电路中主要使用了 X25045 看门狗芯片、EEPROM 芯片 ATC24C02、MAX232C 串口接口芯片、Intel 8255A 并行口扩展芯片、等等。二、单元电路1、单片机本设计中所选用的单片机型号是mcs-51，围绕单片机构建的单片机最小系统如下图所示。图 2 单片机系统2、看门狗电路对于大型的系统设计，必须考虑系统在运行过程中的“程序跑飞”问题。为防止系统程序跑飞，可在系统中设置看门狗电路。本设计中使用的单片机AT89C52 内部集成了硬件看门狗电路，可以放心省去外部的
2、看门狗电路。内部集成的硬件看门狗电路缺省时为关闭状态，一旦打开就不能关闭，可以单倍速和双倍速反复设置。对于使用的单片机中没有集成内部看门狗电路的设计中，可以选用一些专门的集成的看门狗芯片，这些芯片也可以进行软件编程，使用非常方便。在本设计中，介绍了X25045看门狗芯片的使用方法。图 3 X25045 看门狗电路硬件连接图采用单片机AT89C52 和 X25045 组成的看门狗电路,X25045 硬件连接图如图3 所示。X25045 芯片内包含有一个看门狗定时器，可通过软件预置系统的监控时间。在看门狗定时器预置的时间内若没有总线活动，则X25045 将从 RESET 输出一个高电平信号，经过微
3、分文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:
4、CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A
5、3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10
6、 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2
7、M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7
8、 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1
9、A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3电路 C2、R3输出一个正脉冲，使CPU 复位。图2 电路中，CPU 的复位信号共有3 个：上电复位(C1、R2)，人工复位(S、R1、R2)和 Watchdog 复
10、位(C2、R3)，通过或门综合后加到RESET 端。C2、R3 的时间常数不必太大，有数百微秒即可，因为这时CPU 的振荡器已经在工作。看门狗定时器的预置时间是通过X25045 的状态寄存器的相应位来设定的。如表2所示，X25045 状态寄存器共有6 位有含义，其中WD1、WD0 和看门狗电路有关，其余位和EEPROM 的工作设置有关。表 1 X25045 状态寄存器WD1 0，WD0=0，预置时间为1.4s。WD1 0，WD0=1，预置时间为0.6s。WD1 1，WD0=0，预置时间为0.2s。WD1 1，WD0=1，禁止看门狗工作。看门狗电路的定时时间长短可由具体应用程序的循环周期决定，通
11、常比系统正常工作时最大循环周期的时间略长即可。编程时，可在软件的合适地方加一条喂狗指令，使看门狗的定时时间永远达不到预置时间，系统就不会复位而正常工作。当系统跑飞，用软件陷阱等别的方法无法捕捉回程序时，则看门狗定时时间很快增长到预置时间，迫使系统复位。3、EEPROM 的扩展在测控系统中，通常需要存储大量的数据，这就需要你较大的存储空间，而单片机自带的存储空间有限，所以就需要我们对外部存储空间进行扩展。EEPROM 主要有以下特点：1）、对硬件电路没有特殊要求，无需主用电路，编程简单，早期的EEPROM 芯片是靠外加电压电源进行擦写，现在把升压电路集成在芯片内部，使得擦写操作在+5V 电源下即
12、可完成。2）、采用+5V 电源供电，一般不需要设置单独的擦除操作，在写入的过程中自动擦除。EEPROM 擦写时间较长，约10ms,需要保证有足够的写入时间。现在许多EEPROM 芯片都设有写入结束标志，可供查询或中断使用，为编程提供了方便。3）、EEPROM 有并行总线传输的芯片和串行总线传输的芯片两种。串行的EEPROM 芯片具有体积小、成本低、电路连接简单，占用系统地址线和数据线少的特点。但在数据传送时相对的来说速度较慢。本设计中介绍了EEPROM 芯片 ATC24C02 的扩展，该芯片与单片机的连接示意图如图4示。文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6
13、I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文
14、档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH
15、6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y
16、6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 H
17、Q3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8
18、V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 Z
19、K7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3图 4 ATC24C02 的扩展4、通信接口电路 MAX485 接口芯片是 Maxim 公司的一种 RS-485 芯片。采用单一电源+5V 工作，额定电流为 300 A，采用半双工通讯方式。它完成将TTL 电平转换为 RS485电平的功能。其
20、引脚结构图如图 5 所示。从图中可以看出，MAX485 芯片的结构和引脚都非常简单，内部含有一个驱动器和接收器。RO 和 DI 端分别为接收器的输出和驱动器的输入端，与单片机连接时只需分别与单片机的 RXD 和 TXD 相连即可；/RE 和 DE 端分别为接收和发送的使能端，当/RE 为逻辑 0 时，器件处于接收状态；当 DE 为逻辑 1 时，器件处于发送状态，因为 MAX485 工作在半双工状态，所以只需用单片机的一个管脚控制这两个引脚即可；A端和 B 端分别为接收和发送的差分信号端，当 A 引脚的电平高于 B 时，代表发送的数据为1；当 A 的电平低于 B 端时，代表发送的数据为0。在与单
21、片机连接时接线非常简单。只需要一个信号控制MAX485 的接收和发送即可。同时将 A 和 B 端之间加匹配电阻，一般可选 100 的电阻。图 5 PC 机与单片机串行通信连接图5、单片机并行口的扩展文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7
22、J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I1
23、0N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编
24、码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W
25、1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D
26、10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3
27、S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5
28、M7 ZK7J1A6I10N3 Tntel 8255A 是一个通用的可编程的并行口芯片，它有3 个并行口，又可通过编程设置多种工作方式，价格低廉，使用方便，可以直接与Tntel 系列的芯片连接使用，在中小系统中有着广泛的应用。图 6 单片机 I/O 口扩展二、测量部分1、状态量检测设计要求：4 路（0，+5V）状态量检测；4 路（0，+12V）状态量检测.本设计中使用TLP521-4 光耦进行光电隔离。文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y
29、6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 H
30、Q3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8
31、V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 Z
32、K7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6
33、I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文
34、档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH
35、6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3图 7 8 路开关量检测2、模拟量检测设计要求：1）使用 A/D 转换器，12 位分辨率，8 通道，串行通信方式；2)4 路直流量转换，4路交流量转换。常见的 A/D 转换器输出多为并行方式输出，占用单片机得资源较多。而对于这样的通用测控系统的设计，单片机的资源非常有限，因此节省资源就非常必要了。因此，本设计中选用了串行方式输出的模数转换器。是内含8 通道的多
36、路转换器、宽带的跟踪/保持电路和串行接口。其4线的串行口可以直接与 51 单片机直接连接。串行口速率达2MHz。文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J
37、1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10
38、N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码
39、:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1
40、A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D1
41、0 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S
42、2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3图 8 串口与单片机连接图MAX1202 具有精度高、速
43、度快、使用灵活和体积小的优点，为设计人员提供了一种高性价比的选择。它可广泛应用于数据采集、高精度过程控制、电池电源装置、医疗仪器等。3 脉冲量的测量在计算机测控系统中，常常要求有计数器能对外部事件计数，如测速电机的转速、频率、工件个数等。脉冲量的测量就可以通过计数器来实现。可将脉冲输入接单片机引脚T0（P3.4）或 T1(P3.5)。在这种情况下，当检测到输入引脚上的电平由高跳变到低时，计数器加 1，这个过程需要两个机器周期来识别一个从1到 0 的跳变，故最高计数频率为晶振频率的 1/24。三、输出部分1 开关量输出设计要求：1）要求光电隔离；2）4路接 220V 交流负载，4 路接+12V
44、直流负载。文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文
45、档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH
46、6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y
47、6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 H
48、Q3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8
49、V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 Z
50、K7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3图 9 +12V 直流负载接线图文档编码:CH6W1A3Y6D10 HQ3S2M8V5M7 ZK7J1A6I10N3文档编码:CH6W1A3Y6D10 HQ3