SLOA101B August   2002  – May 2016 SN55HVD233-SEP , SN65HVDA1040A-Q1 , SN65HVDA1050A-Q1 , SN65HVDA540-5-Q1 , SN65HVDA540-Q1 , SN65HVDA541-5-Q1 , SN65HVDA541-Q1 , SN65HVDA542-5-Q1 , SN65HVDA542-Q1

 

  1.   Introduction to the Controller Area Network (CAN)
    1.     Trademarks
    2. 1 Introduction
    3. 2 The CAN Standard
    4. 3 Standard CAN or Extended CAN
      1. 3.1 The Bit Fields of Standard CAN and Extended CAN
        1. 3.1.1 Standard CAN
        2. 3.1.2 Extended CAN
    5. 4 A CAN Message
      1. 4.1 Arbitration
      2. 4.2 Message Types
        1. 4.2.1 The Data Frame
        2. 4.2.2 The Remote Frame
        3. 4.2.3 The Error Frame
        4. 4.2.4 The Overload Frame
      3. 4.3 A Valid Frame
      4. 4.4 Error Checking and Fault Confinement
    6. 5 The CAN Bus
      1. 5.1 CAN Transceiver Features
        1. 5.1.1  3.3-V Supply Voltage
        2. 5.1.2  ESD Protection
        3. 5.1.3  Common-Mode Voltage Operating Range
        4. 5.1.4  Common-Mode Noise Rejection
        5. 5.1.5  Controlled Driver Output Transition Times
        6. 5.1.6  Low-Current Bus Monitor, Standby and Sleep Modes
        7. 5.1.7  Bus Pin Short-Circuit Protection
        8. 5.1.8  Thermal Shutdown Protection
        9. 5.1.9  Bus Input Impedance
        10. 5.1.10 Glitch-Free Power Up and Power Down
        11. 5.1.11 Unpowered Node Protection
        12. 5.1.12 Reference Voltage
        13. 5.1.13 V-Split
        14. 5.1.14 Loopback
        15. 5.1.15 Autobaud Loopback
      2. 5.2 CAN Transceiver Selection Guide
    7. 6 Conclusion
    8. 7 Additional Reading
  2.   Revision History

5.1.1 3.3-V Supply Voltage

Most CAN transceivers require a 5-V power supply to reach the signal levels required by the ISO 11898 standard. However, by superior attention to high-efficiency circuit design, the TI 3.3-V CAN transceiver family operates with a 3.3-V power supply and is fully interoperable with 5-V CAN transceivers on the same bus. This allows designers to reduce total node power by 50% or more (Figure 10).

pwrsav_loa101.gifFigure 10. 3.3-V CAN Transceiver Power Savings

In addition to the inherent power savings of using a 3.3-V transceiver, for applications using 3.3-V technology, such as the TI TMS320C28xx family of DSPs with integrated CAN controllers, the need for a 5-V power supply can be eliminated. This lowers the overall part count for the node, reducing system cost and increasing system reliability.

For designers with an existing system design which requires a 5-V-powered transceiver, the TI 5-V transceivers are available with a wide variety of features such as high ESD protection and wide common-mode range.