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STDES-I4S

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4-Layer Reference design based on SMDs with STM32WL UFBGA MCU

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Parameter NameParameter Value
Core ProductSTM32WL55JC
GradeIndustrial

The main objective of STM32WL reference designs is to recommend a layout and associated BOM for dedicated applications (these boards are not for sale).


Performance has been assessed and an FCC and CE certification checks has been done by an independent company.


These STM32WL reference designs can be manufactured from files that can be downloaded from www.st.com website. A complete application can be prototyped thanks to the access to all GPIOs.


Sensitive layout parts can be extracted and pasted in any user board design with same PCB characteristics and feature set.


The STM32WL reference designs are provided with the STM32WL comprehensive software HAL library. The STM32CubeWL MCU Package contains many software examples developed with the STM32WL Nucleo-64 board (NUCLEO-WL55JC). These examples can be easily adapted for STM32WL reference designs. A dedicated delivery is provided for radio AT_Slave firmware that is fully compatible with the selected STM32WL reference board.


The firmware source code can be found on st.com web page corresponding to the wanted reference design. This associated firmware is distributed under license BSD-3-Clause (https://opensource.org/licenses/BSD-3-Clause).


Using STM32WL reference designs to design the user application helps to get the right RF performances and to pass certification with success.

Key features
  • Includes ST state-of-the-art patented technology
  • Reference designs
    • Fully open hardware platforms
    • Suitable for rapid prototyping of end nodes based on LoRaWAN®, Sigfox™, WM-Bus, and many other proprietary protocols
  • STM32WL5x microcontroller
    • Multi protocol LPWAN dual-core 32-bit Arm® Cortex® -M4/M0+ at 48 MHz
    • Ultra-low power
    • RF transceiver (150 MHz to 960 MHz frequency range) supporting LoRa®, (G)FSK, (G)MSK, and BPSK modulations
    • Up to 256-Kbyte Flash memory and 64-Kbyte SRAM
  • Oscillators
    • 32.768 kHz LSE crystal
    • 32 MHz HSE (on-board TCXO or crystal XO)
  • Connectors
    • 2x HE10-20
    • SMA antenna
    • 2-point UART
  • Power
    • 1.8 V to 3.6 V through external sources
  • Designs with different references show different layouts. Picture is not contractual.
  • Debug/programing
    • through JTAG/serial-wire debug port to connect an external STLINK
  • Software
    • Comprehensive free software libraries and examples available with the STM32CubeWL MCU Package usable with adapted BSP