CAN_tcs_ppt
- 1. October 26, 2016 CAN Abhishek Mishra Tata Consultancy Services
- 2. October 26, 2016 Contents •WhatisCAN? •History •CANstandards •HowdoesCANwork? •Message Formats •Errordetectionandfaultconfinement •BitTiming
- 3. October 26, 2016 What is CAN? • The Controller Area Network (CAN) is a serial, a synchronous, multi-master communication protocol for connecting electronic control modules in automotive and industrial applications. • It is a message-based protocol .
- 4. October 26, 2016 History • Development of the CAN bus started in 1983 at Robert Bosch GmbH. • The protocol was officially released in 1986 at the Society of Automotive Engineers (SAE) congress in Detroit, Michigan. • The first CAN controller chips, produced by Intel and Philips, came on the market in 1987. The 1988 BMW 8 Series was the first production vehicle to feature a CAN-based multiplex wiring system.
- 5. October 26, 2016 CAN standards • Two specifications are in use: • 2.0A sometimes known as Basic or Standard CAN with 11 bit message identifiers which was originally specified to operated at a maximum frequency of 250Kbit/sec - ISO11519. • 2.0B known as Full CAN or extended frame CAN with 29 bit message identifier which can be used at up to 1Mbit/sec - ISO 11898.
- 7. October 26, 2016Technical Center IndiaDelphi Confidential
- 8. October 26, 2016 Layered Structure of a CAN Node • Application Layer • Object Layer – Message Filtering – Message and Status Handling • Transfer Layer – Fault Confinement – Error Detection and Signaling – Message Validation – Acknowledgement
- 9. October 26, 2016 Layered Structure of a CAN Node – Arbitration – Message Framing – Transfer Rate and Timing • Physical Layer – Signal Level and Bit Representation – Transmission Medium
- 10. October 26, 2016 CAN from OSI perspective Protocol Overview: - Data Link Layer - Logical link Control - Acceptance filtering - Overload notification - Recovery management - Medium Access control - Data encapsulation - Frame coding - Error detection/signaling - Acknowledgement - Serialization/de serialization - Physical Layer - Bit encoding/decoding - Bit timing - Synchronization
- 11. October 26, 2016 CAN Data Frame • CAN Data Frame
- 12. October 26, 2016 CAN Message Frames • Data Frame – Used to transmit up to 8 bytes of data • Remote Frame – Used to request a data frame • Error Frame – Used to indicate error to the entire network (Not under CPU control). • Overload Frame – Used to create an extra delay between frames
- 13. October 26, 2016 CAN Arbitration
- 14. October 26, 2016 Further reading • www.can-cia.de • www.bosch.de/k8/can/ • www.iso.org/ch/
- 15. October 26, 2016 Thank You By :Abhishek Mishra