基于MCP2551的CAN接口电路低功耗设计  

Low-Power Design of CAN-Bus Interface Circuit Based on MCP2551

作　　者：苏伟达[1] 吴允平[1] 李汪彪[1] 蔡声镇[2] 吴进营[1] 

机构地区：[1]福建师范大学电子信息工程系,福州350007 [2]福建师范大学软件学院,福州350007

出　　处：《电子器件》2010年第6期742-745,共4页Chinese Journal of Electron Devices

基　　金：福建省自然科学基金项目资助(2010J01326);福建省科技厅项目资助(2008H0022;2009H0018);福建省教育厅项目资助(JA10078)

摘　　要：分析了基于MCP2551的CAN总线接口电路功耗大的原因,并根据该芯片的应用特点,设计了一种低功耗的CAN总线接口电路,它能够自动检测CAN总线上节点的通信情况,在空闲时自动进入待机模式,从而有效降低了每一个CAN节点的功耗。测试和实践表明:该电路实现方法简单,在不影响正确通信的情况下,功耗仅为改进前的2.2%。本设计也适用PCA82C250、SN65HVD230芯片。Considering power consumption of MCP2551 which is widely used as CAN bus chip and its characteristics,a new low-power circuit which can simultaneously switch MCP2551＇s modes is designed after detecting the communication circumstances at CAN bus node.Moreover,it can enter into standby mode automatically while there is no communicating through CAN bus,thus reducing energy consumption for each CAN node.Result indicates that this technical circuit does not only demolish normal communication,but also reduce power consumption down to 2.2%.This design is also applicable for other ICs such as PCA82C250 and SN65HVD230.

关 键 词：CAN总线 接口电路 MCP2551 低功耗 

分 类 号：TP23[自动化与计算机技术—检测技术与自动化装置]