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LDLL16ENTR Datasheet(PDF) 30 Page - STMicroelectronics |
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LDLL16ENTR Datasheet(HTML) 30 Page - STMicroelectronics |
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30 / 102 page  5.2 CAN FD light compatible network protocol The LDLL16EN features a serial CAN FD light compatible interface, a robust commander-responder communication bus It can uses CAN FD physical interface, therefore differential bus wiring, and a protocol implemented by a CAN FD protocol controller. It guarantees a defined edge density for synchronization and, for safety, CRC and error checking are provided. The system overview is shown in the Figure 18. The communication commander is implemented in the rear LED ECU using the protocol controller in the µC and a CAN FD transceiver. An additional transceiver (for example LIN, high speed CAN or others) may be used by the ECU to communicate with other ECUs in the car. The communication responders are located in the LED satellites. The communication commander is implemented in the rear LED ECU using the protocol controller in the μC and a CAN FD transceiver. An additional transceiver (for example LIN, high-speed CAN or other) may be used by the ECU to communicate with other ECUs in the car. The communication responders are located in the LED satellites. Figure 18. System overview Rear Light / Bus Commander RX/TX PHY MCU LDLL16EN LDLL16EN PHY ... ... Rear Light Satellite #1 Transceiver LDLL16EN RX/TX LDLL16EN ... Body Control Module Communication (LIN, CAN…) Power Supply Rear Light Satellite #n Transceiver LDLL16EN RX/TX LDLL16EN ... CAN FD Light compatible 5.3 Protocol overview 5.3.1 Basic overview The CAN FD light compatible network is a bus system on which all participants share the same differential wires. Messages being sent by one participant are received by all others. Its protocol uses a commander-responder scheme. The commander is implemented in the host ECU while the responders are built in the LED drivers. The responders only answer upon request by the commander, therefore no collision resolving mechanisms are needed. Two basic message types are used: broadcast messages and unicast messages. A broadcast message is sent to the responders and expects no answer from them. The responders on the bus pick the data relevant for them from the message. A unicast message is addressed to a specific responder that answers by sending the requested data. A specific unicast message can be sent in predefined intervals to serve a watchdog triggering. The unicast message can expect an answer from the addressed responder within a given time frame. Both mechanisms can be used to implement an efficient supervision scheme, which allows the detection of a disconnected or failed network participant. LDLL16EN Communication interface DS14111 - Rev 5 page 30/102 |
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