SLLA521B January   2022  – June 2022 TCAN1145-Q1 , TCAN1146-Q1

 

  1.   Abstract
  2.   Trademarks
  3. 1Introduction – Partial Networking
  4. 2Partial Networking Application
    1. 2.1 Modes of Operation and Partial Networking
    2. 2.2 Sleep Mode and Partial Networking
    3. 2.3 Wake-Up Frame
    4. 2.4 Classical High-speed CAN, CAN FD, and PN
    5. 2.5 Mixed Network Information
  5. 3CAN Frames and Wake-up Frames
    1. 3.1 CAN Frame Structure
    2. 3.2 Wake-up Frames
      1. 3.2.1 ID Field Match
      2. 3.2.2 Data Length Code (DLC) Match
      3. 3.2.3 Data Match
      4. 3.2.4 CRC Match
      5. 3.2.5 Acknowledge Match
    3. 3.3 Error Counter
    4. 3.4 Selective Wake FD Passive
  6. 4Selective Wake Registers
  7. 5Configuring Partial Networking
    1. 5.1 Valid CAN Message ID Example
    2. 5.2 Valid Data Example
  8. 6Summary
  9. 7References
  10. 8Revision History

6 Summary

Partial networking is an extremely important function within CAN systems. It allows a reduction of power consumption, which has a direct effect on vehicle emissions. Since there are many applications for partial networking, it is important that any engineer working with CAN is aware of and understands partial networking. This application report serves as an informative guide to any engineer learning partial networking and implementing it using the TCAN1145-Q1 and TCAN1146-Q1.

The benefit of partial networking is to reduce the overall power consumption in the network and is ideal for mixed networks. Because each ECU uses less power while in sleep mode, it benefits the network to only enable needed nodes while the rest are in a low power sleep mode. This is especially important in an automotive setting. Internal combustion engine vehicles use an alternator to recharge their battery and if the vehicle is drawing more power than the alternator can supply, the battery is discharged. This is important when the engine is not running, because sleep mode limits the current and reduces the drain on the battery. The reduced power consumption due to partial networking can have a direct correlation to emissions in vehicles and by reducing the current draw of a car.