STM32F401C

Package: UFQFPN48 Part No: STM32F401C[B/C/D/E]U6, STM32F401C[C/E]U6

For STM32F401C C denotes 48pin QFP or 49pin CSP B for 128K flash, C for 256K, D for 384K, E for 512K, all should be fine for this product. U denotes UFQFPN48 6 for industrial temp (the only option)

For STM32F411C

STM32F401 Boot Mode

According to AN2606, both F401 and F411 chips apply to boot mode pattern 1 for boot from bootloader:

Boot pin 0 = 1, Boot pin 1 = 0

For normal boot, boot pin 0 set to 0 and boot pin 1 is irrelevant.

CHECK (SCH pull down both boot pin 0 and 1, CC2540 can drive STM32_RESET and STM32 BOOT0.