On Semi NCV7341 CAN收发应用方案

On Semi 公司的NCV7341是CAN收发器,是CAN协议控制器和物理总线间接口,用于12V和24V系统. NCV7341对总线提供不同的传输功能和对CAN控制器提供不同的接收能力.单电源去掉后, NCV7341具有理想的无源特性,完全和ISO 11898标准兼容,速率高达1Mb,具有非常低的电磁辐射(EME).总线连接多达110个节点,可用在汽车和工业网络.本文介绍了NCV7341的主要特性,方框图以及和3V/5V CAN控制器的应用电路图, 时序特性测试电路图和汽车瞬态测试电路图。

The NCV7341 CAN transceiver is the interface between a controller area network (CAN) protocol controller and the physical bus and may be used in both 12 V and 24 V systems. The transceiver provides differential transmit capability to the bus and differential receive capability to the CAN controller.

Due to the wide common mode voltage range of the receiver inputs, the NCV7341 is able to reach outstanding levels of electromagnetic susceptibility (EMS). Similarly, extremely low electromagnetic emission (EME) is achieved by the excellent matching of the output signals.

The NCV7341 is a new addition to the ON Semiconductor CAN high speed transceiver family and offers the following additional features:

NCV7341主要特性:

Ideal Passive Behavior when Supply Voltage is Removed

Separate VIO Supply for Digital Interface Allowing Communication to CAN Controllers and Microcontrollers with Different Supply Levels

Fully Compatible with the ISO 11898 Standard

High Speed (up to 1 Mb)

Very Low Electromagnetic Emission (EME)

VSPLIT Voltage Source for Stabilizing the Recessive Bus Level if Split Termination is Used (Further Improvement of EME)

Differential Receiver with High Common Mode Range for Electromagnetic Immunity (EMI)

Up to 110 Nodes can be Connected in Function of the Bus Topology

Transmit Data (TxD) Dominant Time out Function

Bus Pins Protected Against Transients in Automotive Environments

Bus Pins and Pin VSPLIT Short Circuit Proof to Battery and Ground

Thermally Protected

NCV Prefix for Automotive and Other Applications Requiring Site and Control Changes

These are Pb Free Devices*

NCV7341典型应用:

Automotive

Industrial Networks

图1.NCV7341方框图

图2. NCV7341和5V CAN控制器的应用电路图

图3. NCV7341和3V CAN控制器的应用电路图

图4. NCV7341基本测试电路图

图5. 汽车瞬态的NCV7341测试电路图

图6. NCV7341时序特性测试电路图