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CC3235SF: Query on frequency restrictions of TI CC3235SF WIFI module in SDK

Tao Ao
Prodigy 50 points
Part Number: CC3235SF
Other Parts Discussed in Thread: UNIFLASH

Tool/software:

Query on frequency restrictions of TI CC3235SF WIFI module in SDK
Dear TI FAE Team,
I am currently using TI CC3235SF WIFI module and encountered some issues regarding frequency restrictions in specific countries. I hope you can provide some guidance on this matter.
I understand that TI SDK provides an API for setting the country of WIFI use, and the available frequencies in different countries are different. However, I encountered an issue with the frequencies in Malaysia, for example.
In Malaysia, the latest regulations for medical devices require that the frequencies of 5651 - 5725MHz must be permanently disabled, otherwise the device will not be able to complete the registration in its country, but I found that the frequencies within the restricted range are still included in the available frequencies set in this country. The following figure is the frequency supported by the corresponding Malaysian country number:

However, the latest regulations require that the frequencies that need to be banned are as shown in the figure below, and the gray ones in the figure are the frequencies that cannot be used:

I wonder if there is a way to specifically exclude these restricted frequencies in the SDK settings. Is there any other configuration or function that can be used to ensure compliance with the frequency restrictions in Malaysia?
Also, I am concerned about potential issues in other countries with frequency restrictions, such as Thailand (allowed frequency range is also under discussion) and Taiwan (5.670 - 5.690GHz is not allowed).

I also learned that there is an interface in the unflash software that can configure the corresponding RF signal, but I don't know what this is for:


If there are any general guidelines or best practices for handling such frequency restrictions in different countries using TITI CC3235SF, I would appreciate it if you could share with me.
Thank you very much for your time and support. Looking forward to your prompt response.
Regards,

  • 0
    TI__Expert 3180 points

    Hello Tao,

    CC3235 only supports predefined regulatory domains for FCC, ETSI, and Japan. 

    In order to restrict other channels you could do so by masking certain channels from scan. This way if you do not want to transmit or connect to an AP in channel 128 for example, you could set the device to not scan in that channel. 

    In the sl_WlanSet API there is a parameter called ChannelsMask, and you can set this for 5GHz channels as well.

    The interface in the uniflash image creator which you showed in the screenshot above is used for increasing the back-off on certain channels, meaning you can set limits for tx power in certain channels beyond the regulatory domain. However this is not going to work for your requirement because you need to completely shut off tx power and connection capability to a given channel. 

    Regards,

    Jonathan