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K
Kombo
Visitor II
February 19, 2025
Question

STSAFE-A110 Provisioning and STEVAL-WBC2TX50-Based Wireless Charger Prototype

  • February 19, 2025
  • 1 reply
  • 831 views

Hello, I am reaching out for assistance regarding a wireless charging prototype I have developed based on the STEVAL-WBC2TX50 wireless power transmitter evaluation board.

Here are the key details of my project:

Design and Assembly

- I followed the schematics, PCB layout, and reference designs provided in the UM3231 user manual.

-All components were sourced according to the BOM, including the STSAFE-A110 chip.

-I successfully assembled the PCB and flashed the firmware into the STWBC2-HP chip

Current Issue

  • The wireless charger is not charging my Qi 1.3-compliant device (iPhone 11).

  • When powered up and connected to the STSW-WBC2STUDIO GUI, the system remains in the WAIT State, with the PING_TIMEOUT event continuously logged.

  • The Presence Detection values fluctuate, and the Bridge Voltage remains at 4.8 V, indicating that power transfer is not initiating.

  1. Suspected Issue:

    • I suspect the issue may be related to the STSAFE-A110 chip, as it appears that the chip needs to be provisioned with a Qi certificate chain to work with commercial devices like the iPhone 11.

    • I am unsure if the STSAFE chip is the root cause or if there are other issues with my design or firmware configuration.

  2. Request for Assistance:

    • Could you please guide me on how to provision the STSAFE-A110 chip with the necessary Qi certificate chain?

    • Are there additional steps or configurations required beyond assembling the PCB and flashing the firmware to make the system operational?

    • If the STSAFE chip is not the issue, could you provide guidance on troubleshooting the design or firmware?

I am happy to provide additional information, such as screenshots from the GUI or further details about my setup, to assist in diagnosing the issue.

Thank you for your support, and I look forward to your response.

Regards

Kombo

    This topic has been closed for replies.

    1 reply

    B
    Benjamin BARATTE
    ST Employee
    February 24, 2025

    Hi @Kombo ,

     

    Thanks for your interest to ST Solution

     

    Regarding the STSAFE-A110 solution for Qi 1.3 you need to have a custom personalization.

    Even with test sample, they are not compatible for official Qi device. This is only for testing.

    To be compatible with an official Qi device, you need to get WPC certification of your design and then we can help you to get the Qi certificate for your product.

     

    But you can't build up a test device and try it with Official Qi device.

     

    Best Regards,

     

    Benjamin

     

     

    K
    KomboAuthor
    Visitor II
    February 25, 2025

    Dear Benjamin,

    Thank you for your response and clarification regarding the Qi 1.3 authentication requirements for official Qi-certified devices.

    Since I am currently developing a prototype device with wireless charging, I am not pursuing WPC certification at this stage, I would like to know if there is a way to use the STEVAL-WBC2TX50 or my custom design in developer mode that allows testing without full Qi authentication.

    Specifically, I would like to understand:

    • Can I bypass or disable the STSAFE-A110 authentication for testing purposes?
    • Is there an alternative way to test wireless power transfer to mobile devices on my custom design?

    I appreciate any guidance you can provide on how to proceed with testing in a development environment.

    Regards

    Kombo

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