https://community.nxp.com/t5/In-Vehicle-Networking/TJA1043-application/m-p/2144794#M77 <P>您给的资料中提到了While the microcontroller is completely un-powered (no VCC supply),<BR />the TJA1043 keeps partly alive via its battery supply. It allows the transceiver to monitor<BR />the bus for CAN messages。我理解这就是TJA1043可以在没有VCC的情况下继续监听总线报文的原因吧</P> Fri, 01 Aug 2025 00:53:26 GMT loswe 2025-08-01T00:53:26Z https://community.nxp.com/t5/In-Vehicle-Networking/TJA1043-application/m-p/2144170#M73 <P>你好，对于TJA1043的应用原理图（page 19）我有个疑问想请教：</P><P>TJA1043的INH引脚控制了给TJA1043的VCC引脚供电的5V电源芯片的使能引脚，那么当INH拉低5V电源芯片的使能引脚，5V电源芯片不能给TJA1043的VCC引脚供电，TJA1043没有供电，它如何输出INH信号来拉高5V电源芯片的使能呢</P> Thu, 31 Jul 2025 05:37:24 GMT https://community.nxp.com/t5/In-Vehicle-Networking/TJA1043-application/m-p/2144170#M73 loswe 2025-07-31T05:37:24Z https://community.nxp.com/t5/In-Vehicle-Networking/TJA1043-application/m-p/2144235#M74 <P>&nbsp;</P> <P>INH 是上拉到VBAT的，通过外部设置STB/EN来控制TJA1043的状态控制INH的H/L,他是一直受控的因为VBAT没断电，比方说上电VBAT以后 TJA1043工作在sleep的模式，STB/EN都是floating的无法唤醒他，那么可以通过本地wake pin 或者Remote wake-up (via the CAN bus)唤醒 让INH 拉高从而让TJA1043 工作：</P> <P>Any wake-up request, setting the Pwon flag or a <STRONG>LOW-to-HIGH transition on STB_N will </STRONG><BR /><STRONG>clear UVNOM and the timers</STRONG>, allowing the voltage regulators to be reactivated (at least until <BR />UVNOM is set again).</P> <P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="guoweisun_0-1753941245889.png" style="width: 400px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/350391i3BAAC96B728AE68F/image-size/medium?v=v2&amp;px=400" role="button" title="guoweisun_0-1753941245889.png" alt="guoweisun_0-1753941245889.png" /></span><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="guoweisun_1-1753941263720.png" style="width: 400px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/350392i01C07A392565CC9B/image-size/medium?v=v2&amp;px=400" role="button" title="guoweisun_1-1753941263720.png" alt="guoweisun_1-1753941263720.png" /></span></P> <P>&nbsp;</P> Thu, 31 Jul 2025 06:52:01 GMT https://community.nxp.com/t5/In-Vehicle-Networking/TJA1043-application/m-p/2144235#M74 guoweisun 2025-07-31T06:52:01Z https://community.nxp.com/t5/In-Vehicle-Networking/TJA1043-application/m-p/2144302#M75 <P><SPAN>常电应用场景中VBAT是不断电的，按照参考应用原理图，本地wake pin是通过电阻上拉到VBAT的，那wake pin始终是高电平，是不是就不能用来控制唤醒。</SPAN></P><P><SPAN>via the CAN bus的话，TJA1043的VCC没有供电，它可以收到CAN bus的唤醒报文吗。</SPAN></P> Thu, 31 Jul 2025 07:41:42 GMT https://community.nxp.com/t5/In-Vehicle-Networking/TJA1043-application/m-p/2144302#M75 loswe 2025-07-31T07:41:42Z https://community.nxp.com/t5/In-Vehicle-Networking/TJA1043-application/m-p/2144523#M76 <P>Sleep 模式VCC本来就没电了</P> <P>您仔细看看AH1014 page45：6.2.4 Sleep Mode&nbsp;</P> <P><A href="https://www.nxp.com.cn/docs/en/supporting-information/AH1014_v1_4_Application_Hints_TJA1042_43_48_51.pdf" target="_blank">Application Hints</A></P> Thu, 31 Jul 2025 11:44:27 GMT https://community.nxp.com/t5/In-Vehicle-Networking/TJA1043-application/m-p/2144523#M76 guoweisun 2025-07-31T11:44:27Z https://community.nxp.com/t5/In-Vehicle-Networking/TJA1043-application/m-p/2144794#M77 <P>您给的资料中提到了While the microcontroller is completely un-powered (no VCC supply),<BR />the TJA1043 keeps partly alive via its battery supply. It allows the transceiver to monitor<BR />the bus for CAN messages。我理解这就是TJA1043可以在没有VCC的情况下继续监听总线报文的原因吧</P> Fri, 01 Aug 2025 00:53:26 GMT https://community.nxp.com/t5/In-Vehicle-Networking/TJA1043-application/m-p/2144794#M77 loswe 2025-08-01T00:53:26Z https://community.nxp.com/t5/In-Vehicle-Networking/TJA1043-application/m-p/2144796#M78 <P>对的</P> <P>&nbsp;</P> Fri, 01 Aug 2025 00:56:20 GMT https://community.nxp.com/t5/In-Vehicle-Networking/TJA1043-application/m-p/2144796#M78 guoweisun 2025-08-01T00:56:20Z https://community.nxp.com/t5/In-Vehicle-Networking/TJA1043-application/m-p/2144797#M79 谢谢 Fri, 01 Aug 2025 00:58:04 GMT https://community.nxp.com/t5/In-Vehicle-Networking/TJA1043-application/m-p/2144797#M79 loswe 2025-08-01T00:58:04Z