• State TI Thinks Resolved
  • Locked Locked
  • Replies 2 replies
  • Answers 1 answer
  • Subscribers 79 subscribers
  • Views 212 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

MSP430F2011: We are worried about the influence of transmission rate or other interference after the UART line passes through the headset (the length of the headset is about 650mm), please help to evaluate:

2018
Expert 2630 points
Part Number: MSP430F2011

We have a headset, the basic situation is as follows:

1. There will be one MCU on the left and the right (both powered by 3.3v).

2. Communication between two MCU will use UART

3. The UART wire passes through the headset wire (as shown in the figure below and the use of the wire around the headset wire).

 

We are worried about the influence of transmission rate or other interference after the UART line passes through the headset (the length of the headset is about 650mm), please help to evaluate:

1. From your experience in using TI MCU, does it make any difference?If not, why not?

2. If there is any influence, do I need to add a driver BUFFER?If yes, could you please recommend a two-way bus buffer suitable for UART communication?

3. Does UART transmission line need to be protected by a separate shielding line?

  • 0
    Guru 35580 points
    As always, it depends. You did not even tell us the desired baud rate!
    If you are using straight serial you may or may not have issues.

    As for a "buffer", I suggest RS-485 with twisted pair. You can run dozens of meters over RS-485 at high baud rates.

    Check out the RS-485 eval module:
    www.ti.com/.../RS485-FL-DPLX-EVM
  • 0
    TI__Mastermind 26420 points
    Hello Clark,

    Keith is correct here. Datarate is a key concern. The faster the data rate, the more likely of cross talk. In my opinion, this typically isn't as big of an issue with UART as it could be with high-speed SPI, etc.

    An RS-485 twisted pair like Keith mentioned is specifically designed to transmit data and cancel out noise. I don't know, but this may be overkill for a headset. You might have to do some testing to find out.

    Thanks,
    JD

**Attention** This is a public forum