This board uses the Evezor Stamp STMF405 MCU

source: https://github.com/evezor/Evezor-Stamp-STMF405

An edge board containing a PCA9685 driver chip capable of controlling 16 servos or LEDs. The board also contains 2 pushbuttons and a dpad for easy control/ debugging. Servo power must be supplied from external source

source files can be found here: https://github.com/evezor/v0_servox16_board