6DD2920-0AR6

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6DD2920-0AR6

随着汽车电子技术的发展，越来越多的电子产品装载到汽车上，*地提高了汽车的动力性和舒适性，同时也增加了车内布线的难度和成本。CAN（Controller Area Network）作为一种串行数据通信总线，由于具有良好的可靠性、实时性及灵活性，已经成为标准（ISO11898）^[1]，在汽车电子系统中得到了广泛的应用。
　目前，在CAN系统设计中，使用zui多的是单片机外挂独立的CAN控制器，如Philips公司的PCA82C200、SJA1000以及In公司的82526、82527等芯片。但是采用此类芯片的设计方案不利于系统集成化。本文以Microchip公司内部集成的CAN模块PIC18F258单片机为核心，介绍CAN总线电动车窗控制系统的硬件电路结构及软件设计流程。由于PIC18F258单片机对CAN收发器PCA82C250进行数据操作时只需要TXD、RXD两条数据线，这样就大大简化了硬件电路的设计，提高了系统的可靠性。
1 电动车窗控制系统通信网络的构成
　电动车窗控制系统通信网络共有4个CAN节点电子控制器，分别是：左前门主控制器、右前门子控制器、左后门子控制器、右后门子控制器。采用CAN总线通信技术可以实现4个车门控制器之间的通信,如图1所示。

　操作主控制器除了可以控制驾驶员的车窗玻璃升降外，还可以通过CAN总线控制其余乘客车窗玻璃的升降，同时子控制器也可控制各自位置车窗玻璃的升降。主控制器由Microchip公司的内部集成了CAN模块的PIC18F258单片机、6N137高速光电耦合器、PCA82C250总线收发器等三个主要部分组成。考虑到设计成本和软件编程的方便性，子控制器选用了与主控制器相同的芯片，且具有相同的硬件电路结构。
2 功率驱动芯片及其应用电路
Motorola公司的功率驱动芯片MC33486以其强大的功能和优异的性能在汽车电子中得到了广泛的应用。此芯片的应用模式为桥式结构^[2],芯片内部有2个MOSFET驱动管MOS1、MOS2，外接2个低端MOSFET驱动管MOS3、MOS4组成一个完整的H桥，实现车窗电机的正、反向控制。同时，利用Cur R端的电流镜像功能可方便地实现过流保护和车窗的防夹功能，如图2所示

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