SLLA475 December   2020 TCAN1144-Q1 , TCAN1146-Q1

 

  1. 1TCAN1144-Q1 and TCAN1146-Q1 Functional Safety Manual
  2. 2Trademarks
  3. 3Introduction
  4. 4TCAN114x-Q1 Hardware Component Functional Safety Capability
  5. 5Development Process for Management of Systematic Faults
    1. 5.1 TI New-Product Development Process
  6. 6TCAN1144-Q1 and TCAN1146-Q1 Component Overview
    1. 6.1 Targeted Applications
    2. 6.2 Hardware Component Functional Safety Concept
    3. 6.3 Functional Safety Constraints and Assumptions
  7. 7Description of Hardware Component Parts
    1. 7.1 CAN Transceiver
    2. 7.2 Digital Core
    3. 7.3 EEPROM
    4. 7.4 Power Control IP
      1. 7.4.1 Voltage Monitors
    5. 7.5 Thermal Shut Down
    6. 7.6 Digital Input/Outputs
  8. 8TCAN1144-Q1 and TCAN1146-Q1 Management of Random Faults
    1. 8.1 Fault Reporting
    2. 8.2 Functional Safety Mechanism Categories
    3. 8.3 Description of Functional Safety Mechanisms
      1. 8.3.1 CAN Communication
        1. 8.3.1.1 SM-1: CAN bus fault diagnostic
        2. 8.3.1.2 SM-2: Thermal shutdown; TSD
        3. 8.3.1.3 SM-3: CAN bus short circuit limiter, IOS
        4. 8.3.1.4 SM-4: CAN TXD pin dominant state timeout; tTXD_DTO
        5. 8.3.1.5 SM-17: CAN protocol
      2. 8.3.2 Supply Voltage Rail Monitoring
        1. 8.3.2.1 SM-5: VCC undervoltage; UVCC
        2. 8.3.2.2 SM-6: VSUP supply undervoltage; UVSUP
        3. 8.3.2.3 SM-7: VIO supply undervoltage; UVIO
      3. 8.3.3 SPI/Processor Communication
        1. 8.3.3.1 SM-8: Timout, Window or Q&A watchdog error - Normal mode
        2. 8.3.3.2 SM-9: SPI communication error; SPIERR
        3. 8.3.3.3 SM-10: Scratchpad write/read
        4. 8.3.3.4 SM-11: Sleep Wake Error Timer; tINACTIVE
      4. 8.3.4 Device Internal EEPROM
        1. 8.3.4.1 SM-12: Internal memory CRC; CRC_EEPROM
      5. 8.3.5 Floating Pins
        1. 8.3.5.1 SM-13: SCLK internal pull-up to VIO
        2. 8.3.5.2 SM-14: SDI internal pull-up to VIO
        3. 8.3.5.3 SM-15: nCS internal pull-up to VIO
        4. 8.3.5.4 SM-16: TXD internal pull-up to VIO
          1.        B Revision History

6 TCAN1144-Q1 and TCAN1146-Q1 Component Overview

The TCAN1144-Q1 and TCAN1146-Q1 are enhanced high-speed CAN FD transceivers supporting data rates up to 5 Mbps. These devices are configured using serial peripheral interface (SPI) in order to use all the features available. The devices support 1.8 V to 5 V processors by applying the appropriate voltage to the VIO pin, allowing lower voltage processors to be utilized. The family of devices are register compatible enabling the system designer the flexibility to implement the features needed with minimal if any hardware and software changes.

The TCAN1144-Q1 and TCAN1146-Q1 are full featured devices supporting watchdog and advanced bus diagnostics. For ease of debug, the advanced bus fault diagnostics and communication feature can be used to pinpoint bus faults when used with other devices supporting this feature. The inhibit (INH) pin can be used to enable node power. If inhibit (INH) pin function is not required, the pin can be configured as a limp home function for when a watchdog error takes place.

The TCAN1146-Q1 supports selective wake, also known as partial networking, used in systems containing nodes that can be placed into sleep mode and reducing overall power of the system. The transceiver and selective wake function meets the specifications of the ISO11898-2:2016 standard.

Table 6-1 Device Comparison Table
Device NumberSelective WakeWatchdogBus Fault DiagnosticsLIMP Home Capable
TCAN1144-Q1XXX
TCAN1146-Q1XXXX
GUID-A6E79EAC-A405-4260-B759-340E7FFAD999-low.gifFigure 6-1 TCAN1144-Q1 and TCAN1146-Q1 Block Diagram
GUID-B9C47748-E0AE-416F-AFDE-3F3E40085F5F-low.gifFigure 6-2 Digital Core Block Diagram and Clock Tree