How to tell the difference between BL54L15 mass production and engineering sample versions?

Answer

Our BL54L15 module, based on the nRF54L15 SoC, has undergone updates to its pin and power supply configuration across different hardware versions. Pin 40 (VDD_nRF) has been removed and replaced by Pin 26 (VDDM_nRF). In current hardware revisions and reference designs, the pin formerly designated as VDDM_nRF, which served as the primary power supply, is now referred to as VDD_nRF. For all new designs, VDD_nRF must be used as the main power source instead of VDDM_nRF.

Note: Preliminary engineering samples featured a 40-pin footprint, while mass production versions from revision 3.0 onward use a 39-pin layout. The version number is printed on the module’s silkscreen, as illustrated in the example below — highlighted in red for clarity and easy identification. This change also applies to all related development boards and reflects Nordic’s decision to remove support for the medium voltage mode, which was only present in alpha and beta silicon versions.

Moving forward, normal voltage mode must be implemented and strictly followed. For the most up-to-date information on the operating voltage range for VDD_nRF, please refer to the latest BL54L15 datasheet available on our website: https://www.ezurio.com/documentation/datasheet-bl54l15-series.