2 Replies Latest reply on Feb 13, 2018 1:57 AM by jarvis_2707861

    Strange problems when using AP6234(CYW43340) with STM32

    jarvis_2707861

      Here's my schematic. (Big photo see appendix)I try to use AP6234 module (CYW43340 solution) with STM32 in my project.

      sch.PNG

      But when I finish my layout and after manufacture, I met a strange problem:

      When I use WICED SDK with snip.scan demo, the AP6234 only scans 2.4G APs.

      And I tried to heat the board, and let the module maintain 100℃, now the scan result contains 5G APs.

      But When the module cools down, it still only scans 2.4G APs.

       

      I also tried the board called redbear duo:

      https://github.com/redbear/Duo/blob/master/hardware/schematic/duo-schematic-v1.0.pdf

      I moved the module to this board, the AP6234 works fine.

      The strangest thing is my schematic is same as redbear-DUO board.

      It's very strange, I don't know how to do. Who can help me?Thanks.