The invention discloses an instrument wake-up circuit based on CAN signals, solves the problem of high power consumption of existing instrument wake-up, and belongs to the technical field of automobile instruments. The system comprises a power supply, a power conversion circuit and a CAN transceiver. The voltage output end of the power supply is connected with the voltage input end of the power conversion circuit, the voltage output end of the power conversion circuit is connected with the wake-up voltage input end of the instrument single-chip microcomputer, when the CAN transceiver receives wake-up signals through the CAN bus, the enable control signal output end of the CAN transceiver is connected with the enable control signal input end of the power conversion circuit, and the enable control signal output end of the power conversion circuit is connected with the wake-up voltage input end of the instrument single-chip microcomputer. When the power conversion circuit receives the enable signal, the power conversion circuit converts the voltage of the power supply to the instrument single-chip microcomputer, and instrument awakening is completed. The enabling control end INH of the CAN transceiver is used for power supply enabling of the whole meter, once the whole vehicle has a CAN wake-up signal, the INH forcibly sends out a high level to wake up power supply of the whole vehicle, and thus current loss of a CPU during dormancy can be avoided.
一种基于CAN信号的仪表唤醒电路,解决了现有仪表唤醒功耗大的问题,属于汽车仪表技术领域。本发明包括供电电源、电源转换电路和CAN收发器;供电电源的电压输出端与电源转换电路的电压输入端连接,电源转换电路的电压输出端与仪表单片机的唤醒电压输入端连接,当CAN收发器通过CAN总线收到唤醒信号,CAN收发器的使能控制信号输出端与电源转换电路的使能控制信号输入端连接,当电源转换电路接收到使能信号,电源转换电路将供电电源的电压转换给仪表单片机,完成仪表唤醒。本发明通过CAN收发器的使能控制端INH做整表的供电使能,一旦整车有CAN唤醒信号,INH强制发出高电平,唤醒整车供电,这样做可以避免休眠时CPU的电流损耗。
Instrument wake-up circuit based on CAN signal
一种基于CAN信号的仪表唤醒电路
2022-03-25
Patent
Elektronische Ressource
Chinesisch
IPC: | H04L TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION , Übertragung digitaler Information, z.B. Telegrafieverkehr / B60R Fahrzeuge, Fahrzeugausstattung oder Fahrzeugteile, soweit nicht anderweitig vorgesehen , VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR |
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