1. What is a reference design?
A reference design is an optimized layout for a specific RF use case and that embeds the host processor on board.
This page gives an overview of the main characteristics of these reference designs; more details are available in the data brief DB5558 and some design guides and the integration of the STM32U5 host are described in the application note AN6316.
2. Reference design descriptions.
2.1. 4-Layers reference board (-B and -U version).
This design is composed of 2 boards: B2413 stamp board and B2416 Interface board.
A zip file including Altium database, Manufacturing files and the BOM is available here.
2.1.1. Stamp board B2413
- One small board 20x34 mm including a host STM32U575AIIQ (BGA169 package) and the ST67W611M1 for both -U and -B versions.
2.1.2. Interface board B2416
- One interface board (mini board format 43 x 50 mm) that contains the B2413 board, the Reset and User button for the U5 and a connector for the STLinkV3.
This board is used as an interface to flash the module, send UART commands and power the board.
There are two possible configurations:
- Connect a STLinkV3 (blue circle), which will provide UART connection as well as 5 V supply
or
- Connect UART_FTDI (green circle) and external supply (red circle).
The default power supply configuration is:
- all VDD = 3.3 V from the LDO supplied by the 5 V of the STLinkV3:
The 5 V can also come from the external connector TP5 and all VDD can be supplied externally by the connector JP1 to JP4 with the proper soldering bridge configuration. For more details refer to the schematic.
For debug purpose, these set of boards can be plugged on a mezzanine boards MB1801 that route signals to a Morpho connector:
Note that these boards are only delivered with the STM32WBA and STM32WB09 Nucleo 64 boards
In that configuration, the B2413 stamp board is supplied by the MB1801. For more details refer to the schematic,
2.2. 4 Layers reference board (-P version).
Coming soon.