STM32 Nucleo-64 development board with STM32L476RG MCU, supports Arduino and_ST morpho connectivity
https://www.st.com/en/evaluation-tools/nucleo-l476rg.html
Schematic Packs (原理图及PCB)
https://www.st.com/resource/en/schematic_pack/nucleo_64pins_sch.zip
https://www.st.com/content/ccc/resource/technical/layouts_and_diagrams/schematic_pack/71/1e/2a/ac/