This is a 
STM32C031C4T6 ARM MCU , STM32 Family STM32C0 Series Microcontrollers, ARM Cortex-M0+, 32 bit, 48 MHz, 16 KB New product from STMICROELECTRONICS with the model number STM32C031C4T6
Other details
| Brand | STMICROELECTRONICS | 
| Part Number | STM32C031C4T6 | 
| Quantity | Each | 
| Technical Data Sheet EN |  | 
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