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TPS92662-Q1: Splitting UART/CAN connections

c tyerman
Prodigy 150 points
Part Number: TPS92662-Q1
Other Parts Discussed in Thread: TPS92661-Q1

is it possible to split the CAN/UART connection to allow connection of two (or more) separate PCBs to the same MCU UART? i believe you can usually do this with can with CAN but this chip uses UART over CAN physical layer rather than CAN protocol.


Assuming each TPS92662-Q1 has a unique address, i can see several ways of possibly doing this but am not sure of the advantages/disadvantages of each.

  1. Split the UART TX/RX  Lines from the MCU and connect to two can transceivers which then connect to separate PCBS
  2. Split the CAN BUS Lines and connect two PCBs in parallel on the bus, like standard can bus (Section 5 www.ti.com/.../sloa101b.pdf
  3. Daisy chain series of UART<->CAN<->UART<->CAN<->UART

  • 0
    TI__Mastermind 28655 points
    Hello,

    I'm trying to get answers for this.

    Best Regards,
  • 0 in reply to Irwin Nederbragt
    TI__Mastermind 28655 points
    Hello,

    You should be able to do this on the CAN side just like Section 5 states.

    1) Yes
    2) Yes
    3) Don't think this makes

    Best Regards,
  • 0
    TI__Mastermind 23246 points

    Hello C Tyerman,

    Can you explain what and why you are trying to do this?  Usually this types of schemes are used in address based communications.  How are you going to make this work for UART?  Do you have a block diagram of your concept? 

    -Francis

  • 0 in reply to fhoude
    Prodigy 150 points

    Having reread the TPS92662-Q1 datasheet it actually answers my question but, was not obvious. I am designing some thing similar in concept to   8.1 Application Information - Figure 35. Multi-Board Matrix Manager Application

    though it wasn't immediately obvious that diagram actually shows splitting the CAN connection to connect multiple boards, like option 2 which i described

    From what i understand the TPS92662-Q1 (and the TPS92661-Q1) use UART with addressing from datasheet 7.4.5 UART Interface "The UART communication process uses a command and response protocol mastered by the MCU to write and read the registers to and from each TPS92662 device"

    a block diagram of the UART "bus" exists on that page (Figure 25. TPS92662 UART Connection with CAN Physical Layer)