SLLA651 April   2025 TCAN2845-Q1 , TCAN2847-Q1 , TCAN2855-Q1 , TCAN2857-Q1

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Device States
    1. 2.1 Init Mode
    2. 2.2 Restart Mode
    3. 2.3 Standby Mode
    4. 2.4 Normal Mode
    5. 2.5 Sleep Mode
    6. 2.6 Fail-Safe Mode
  6. 3Power Electronics
    1. 3.1 VSUP
    2. 3.2 VHSS
    3. 3.3 VCAN
    4. 3.4 VCC1
    5. 3.5 VCC2
    6. 3.6 VEXMON, VEXCTRL, and VEXCC
    7. 3.7 HSSx
  7. 4Communication Capabilities
    1. 4.1 CAN-FD and Classical CAN
    2. 4.2 CAN-SIC
    3. 4.3 LIN
  8. 5Protection Features
    1. 5.1 Undervoltage (UV) Monitors
      1. 5.1.1 VSUP
      2. 5.1.2 VHSS
      3. 5.1.3 VCAN
      4. 5.1.4 VEXCC
      5. 5.1.5 VCC1
      6. 5.1.6 VCC2
    2. 5.2 Overvoltage (OV) Monitors
      1. 5.2.1 HSSx
      2. 5.2.2 VCC1
      3. 5.2.3 VCC2
      4. 5.2.4 VEXCC
    3. 5.3 Short Circuit (SC) Monitors
      1. 5.3.1 VCC1
      2. 5.3.2 VCC2
      3. 5.3.3 VEXCC
    4. 5.4 Electrical Faults and Impact on SBC Mode
    5. 5.5 Temperature Sensors
    6. 5.6 Watchdog
      1. 5.6.1 Watchdog Error Counter
      2. 5.6.2 Timeout
      3. 5.6.3 Window
      4. 5.6.4 Initial Long Window
      5. 5.6.5 Q&A
    7. 5.7 Communication Fault Monitoring
      1. 5.7.1 CAN
      2. 5.7.2 LIN
    8. 5.8 LIMP
  9. 6Programming, Memory, and Control
    1. 6.1 SPI
    2. 6.2 EEPROM
    3. 6.3 Interrupts
    4. 6.4 Control
  10. 7Miscellaneous Features
    1. 7.1 Local Wake Ups
    2. 7.2 CAN Bus Wake Up (BWRR)
    3. 7.3 Partial Networking
    4. 7.4 GFO, nRST, and SW
  11. 8Summary
  12. 9References

1 Introduction

The TCAN28xx families of devices are a flexible line of mid-range system basis chips (SBCs) offered by TI. A mid-range SBC includes wired communication, power regulation, and high side switch(es) at a minimum – but this definition leaves a lot out of what the TCAN28xx devices are able to accomplish. The TCAN28xx families of devices include 2 main families – the TCAN284xx and the TCAN285xx lines of devices. These devices are all very similar with the differences easily decoded from the last three digits of the generic part number. If the device is TCAN284xx, the device supports standard CAN and CAN-FD while the TCAN285xx supports CAN-SIC. The second last to digit determines if the device supports LIN – devices with the pattern TCAN28x5x do not support LIN while devices with pattern TCAN28x7x do support LIN. Finally, the last digit determines the output voltage of the VCC1 LDO – devices with TCAN28xx3 have a 3.3V output on VCC1 while devices with TCAN28xx5 have a 5V output on VCC1.

This guide goes over a high-level view of what this device is capable of – and instead of fixating on small nuances this guide aims to give a high-level understanding of the devices features and why the features can be useful for a plethora of systems. This guide can start by going over the different device states that these SBCs employ and why. Next, a closer look at the power electronics integrated into the package. After power, the communication systems are examined. Following communications, the protection features can be explained. There is a brief overview of the programming, memory, and control of the SBC. Finally, miscellaneous features are discussed.