原标题：Freescale MC34901高速CAN收发器工业应用解决方案

　　freescale公司的MC33901是高速CAN收发器,提供MCU CAN协议控制器和物理双线CAN总线间的物理接口,具有极好的EMC和ESD性能,不需要外接滤波器元件.支持工CAN高速应用,以及交通运输,工厂自动化,工业过程控制,电梯/升降机等.本文介绍了MC34901主要特性,框图,电源和双电源应用电路,以及评估板KIT34901EFEVB主要特性, 电源和双电源测试电路和评估板电路图与材料清单.

　　The MC33901/34901 are high speed CAN transceivers providing the physical interface between the CAN protocol controller of an MCU and the physical dual wires CAN bus. They are packaged in an 8 pin SOIC with market standard pin out, and offer excellent EMC and ESD performance without the need for external filter components.

　　Four devices variations are available:

　　- Versions with and without CAN bus wake-up.

　　- Versions with and without TXD dominant protection.

　　MC34901主要特性:

　　•Very low current consumption in standby mode

　　•Automatic adaptation to 3.3 or 5.0 V MCU communication

　　•Standby mode with remote CAN wake-up on some versions.

　　•Pin and function compatible with market standard

　　Cost efficient robustness:

　　•High system level ESD performance

　　•Very high electromagnetic Immunity and low electromagnetic emission without common mode choke or other external components.

　　Fail-safe behaviors:

　　•TXD Dominant timeout, on the MC33901 version.

　　•Ideal passive when unpowered, CAN bus leakage current <10 A.

　　•VDD and VIO monitoring

　　MC34901应用:

　　Industrial Applications (MC34901)

　　•Transportation

　　•Backplanes

　　•Lift/elevators

　　•Factory automation

　　•Industrial process control

　　Automotive Applications (MC33901)

　　•Supports automotive CAN high-speed applications

　　•Body electronics

　　•Power train

　　•Chassis and safety

　　•Infotainment

　　•Diagnostic equipment

　　•AccessoriesEF

　　图1. MC34901框图

　　图2. MC34901简化应用电路图

　　图3. MC34901单电源应用电路图

　　图4. MC34901双电源应用电路图

　　MC34901评估板KIT34901EFEVB

　　This evaluation board allows the user to implement and test the functionalities of the MC34901, High Speed CAN transceiver.

　　The KIT34901EFEVB Evaluation Board is an easy-to-use circuit board that allows the user to exercise the function of the MC34901, High Speed CAN transceiver.

　　•Supply from a single 5.0 V, or dual 5.0 V and 3.3 V supplies

　　•Local switches for single or dual supply selection

　　•Switches for device operating mode selection

　　•Footprint for optional CAN bus filter and protection component

　　•8-pin Single In Line connector to access MC34901 device pins

　　•Two LEDs to display board and MC34901 state

　　图5. MC34901评估板KIT34901EFEVB外形图

　　图6. 评估板KIT34901EFEVB单电源测试电路图

　　图7. 评估板KIT34901EFEVB双电源测试电路图

　　评估板KIT34901EFEVB材料清单: