SLLA685 July   2026 TCAN4550-Q1 , TCAN4551-Q1

 

  1.   1
  2.   Abstract
  3. 1Basic Introduction to TCAN455x-Q1
    1. 1.1 What is an SBC?
    2. 1.2 What is CAN FD?
    3. 1.3 What are the advantages of the TCAN455x-Q1?
    4. 1.4 Difference between TCAN4550-Q1 and TCAN4551-Q1
  4. 2TCAN455x-Q1 Peripheral Circuit Design
    1. 2.1 Power Supply Pins
    2. 2.2 SPI and IO Pins
    3. 2.3 CAN Pins
    4. 2.4 Clock Pins
    5. 2.5 Other Pins
  5. 3Clock Circuit Design for the TCAN455x-Q1
    1. 3.1 Internal Clock Circuit and Operating Principles
    2. 3.2 Quartz Crystal Clock Mode Principle
    3. 3.3 Quartz Crystal Parameters
    4. 3.4 Quartz Crystal Selection
      1. 3.4.1 Issue of Erroneous Entry into Single-Ended Clock Mode
      2. 3.4.2 Solutions for Erroneous Entry into Single-Ended Clock Mode
  6. 4Conclusion
  7. 5References

2.2 SPI and IO Pins

SCLK, SDI, SDO, nCS Pins: The SCLK pin is the SPI clock input, with an internal weak pull-up. The SDI pin is the SPI data input, with an internal weak pull-up. The SDO pin is the SPI data output. The nCS pin is the chip select (active low), with an internal weak pull-up to remain de-asserted.

GPIO/GPO Pins:

For TCAN4550-Q1:

  • The GPIO1 pin default output is M_CAN_INT 1 (active-low interrupt). By configuring register 16'h0800[15:14] = 00, this pin is configured as a GPO output pin, and via register 16'h0800[11:10], it can be set to different GPO functions. By configuring register 16'h0800[15:14] = 10, this pin is configured as a watchdog input reset pin.
  • The GPO2 pin is an open-drain output pin and requires a pull-up resistor to VIO. Register 16'h0800[23:22] configures different GPO outputs, and it can be set as a watchdog output reset pin.

For TCAN4551-Q1:

  • The GPO1 pin default output is M_CAN_INT 1 (active-low interrupt). Via register 16'h0800[11:10], this pin can also be configured as an SPI fault interrupt or undervoltage/overtemperature interrupt.
  • The GPO2 pin is an open-drain output pin and requires a pull-up resistor to VIO. Register 16'h0800[23:22] configures different GPO outputs.