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Philippe SIMONNET
Philippe SIMONNET
ST Employee
October 29, 2024
Question

frequently asked questions on ST S2-LP Sub-1Ghz transceiver

  • October 29, 2024
  • 4 replies
  • 1328 views

Hi,

here is a post for wireless community (Sub-1Ghz solutions) to answer many frequently asked questions and good practices using ST S2-LP transceiver.

please find attached document to get additional information on this perfect Radio chipset.

Thanks

Philippe

    4 replies

    Cezar
    Cezar
    Explorer II
    April 18, 2026

    @Philippe SIMONNET Can you link this document to the product's page?

      Philippe SIMONNET
      Philippe SIMONNETAuthor
      ST Employee
      April 23, 2026

      Hi Cezar,

      wiki page is done, should be quickly available for community (under approval)

      Thanks

      Philippe

        Andrew Neil
        Andrew Neil
        Super User
        April 23, 2026

        @Philippe SIMONNET maybe pin this thread ?

        A complex system that works is invariably found to have evolved from a simple system that worked.A complex system designed from scratch never works and cannot be patched up to make it work.
        R
        RenzoPosega
        Associate
        May 20, 2026

        Dear Mr. Simonnet,

        We are currently using the newer STM32WL33 (M0+MRSubG) for a receiver-only application, and given that the transmitter is continuously transmitting (inserting stuffing bytes between well-formatted packets), we had to adapt the HAL code to a good extent. 

        I found this document and read with much attention the S2-LP recommendations.

        Are this document still applicable (and to which extent) to the STM32WL33?

        In particular, STM32WL33 has the "AFC3" register, which has no direct equivalent in S2-LP. 

        Thanks in advance, 

        Renzo Posega

        Philippe SIMONNET
        Philippe SIMONNETAuthor
        ST Employee
        May 21, 2026

        Hi Renzo,

        S2-LP recommendations are more or less applicable to WL3x radio, even if :

        - WL3x is RF SoC / S2-LP transceiver

        - there are WL3x radio improvements, so register changes happen

        regarding AFC, I can give you recommendations if you tell me Radio configuration you have to use (modulation, packet mode/direct mode, ...)

        or you can also rich me entering support request here Online Support

        (please mention my name, to route ticket to me as fast as possible)

        thanks

        Philippe

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