We make the pre-loaded OBU product (ETC) and install it on the vehicle for ETC transactions.
Now there is a new project, for the consideration of power consumption, we want to use the CAN bus remote message wake mechanism of TCAN1042.
When there is no data interaction on CAN bus, our OBU product enters hibernation mode to reduce the power consumption of the product.
When the CAN bus needs to access the OBU (send data to the OBU), the OBU will be awakened through the remote wake up message of TCAN1042.
Specific implementation methods are as follows:
I'm Zhou Bo from Qianfang Technology.
We make the pre-loaded OBU product (ETC) and install it on the vehicle for ETC transactions.
Now there is a new project, for the consideration of power consumption, we want to use the CAN bus remote message wake mechanism of TCAN1042.
When there is no data interaction on CAN bus, our OBU product enters hibernation mode to reduce the power consumption of the product.
When the CAN bus needs to access the OBU (send data to the OBU), the OBU will be awakened through the remote wake up message of TCAN1042.
The specific implementation method is as follows: as shown in the figure above, when OBU products are powered on, MCU and TCAN1042 are powered on, and after MCU initialization, STB signal is raised (1042 enters STANDBY mode, using VIO power only, and the power consumption is about 12uA).
The MCU then goes to sleep and the system goes into low power mode.When the vehicle side has data sent to 1042, the "WAKE UP PATTERN (WUP)" data frame (remote Wake up message) will be issued first.
Wakup message content is: First Filtered Dominant +Filtered Recast + Second Filtered Dominant, and the time of each segment should exceed TWK_FILTER.
1042 will automatically send low level to MCU through RXD pin (output pin of 1042) after receiving remote wake up message (timing sequence is shown in the figure below), and wake up MCU.
After MCU wakes up, pull STB pin signal low, 1042 enters normal Mode and waits for official data sent by the vehicle side.When the data interaction is finished, the MCU again raises the signal of the STB pin, and then the MCU goes to sleep again and the whole system goes to sleep again.I would like to ask whether 1042 has this function in the above control mechanism, which can support the above overall control process and achieve the purpose of reducing system power consumption. Is there any deviation in my cognition?
Please point out if you have any questions. Thank you.
