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TCAN4550-Q1: The application issues of chips

Tonyx.wu
Genius 4525 points

Part Number: TCAN4550-Q1

Tool/software:

Using the four pins of the SPI interface, as well as the other pins such as nVKRQ, INT, etc., which I haven't connected yet, how should I handle them?  Should I just leave them floating?  Or pull it up or down.  Please provide detailed suggestions and explanations on why and how to connect it?  Thank you!

  • 0
    TI__Mastermind 37181 points

    The 4 SPI pins are required (SCLK, nCS, SDO, and SDI).  They must be connected to the MCU.

    The nINT pin is the hardware interrupt pin and is recommended, but not required.  If it is not used, it can be left floating, but pulling it up to the VIO is a better option.

    The nWKRQ and GPO2 pins are always Output pins and can be left floating if not used.

    The GPIO1 pin is by default configured as an Output, and as long as the GPIO1_CONFIG register setting keeps it as an output, it can be left floating if not used.

    Looking at the schematic, I would strongly suggest a series resistor be included between the OSC1 pin and the crystal to help with optimizing the circuit for stable performance.  A 0-ohm resistor can be used initially and it can always be changed to a different value later.  Please see the TCAN455x Clock Optimization and Design Guidelines Application Report (Link) for more information.

    Regards,

    Jonathan