On Semi NCV7341 CAN收發(fā)應(yīng)用方案

On Semi 公司的NCV7341是CAN收發(fā)器,是CAN協(xié)議控制器和物理總線間接口,用于12V和24V系統(tǒng). NCV7341對總線提供不同的傳輸功能和對CAN控制器提供不同的接收能力.單電源去掉后, NCV7341具有理想的無源特性,完全和ISO 11898標準兼容,速率高達1Mb,具有非常低的電磁輻射(EME).總線連接多達110個節(jié)點,可用在汽車和工業(yè)網(wǎng)絡(luò).本文介紹了NCV7341的主要特性,方框圖以及和3V/5V CAN控制器的應(yīng)用電路圖, 時序特性測試電路圖和汽車瞬態(tài)測試電路圖。

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典型應(yīng)用:

Automotive

Industrial Networks

圖1.NCV7341方框圖

圖2. NCV7341和5V CAN控制器的應(yīng)用電路圖

圖3. NCV7341和3V CAN控制器的應(yīng)用電路圖

圖4. NCV7341基本測試電路圖

圖5. 汽車瞬態(tài)的NCV7341測試電路圖

圖6. NCV7341時序特性測試電路圖