100 MHz Cortex-M4 with 1 MB Flash — the mid-range workhorse
It sits in the STM32F4 series, offering a balance of compute throughput and memory density for applications that need more headroom than the STM32F3 or STM32L4 families provide.
The 320 KB SRAM is larger than the 192 KB found on the STM32F405/407 variants. That extra memory matters when you are running a TCP/IP stack alongside a graphics frame buffer, or when you need to hold a full audio buffer for the SAI peripheral without spilling to external RAM. The 1 MB Flash gives room for a firmware image with OTA staging, though you will want to budget the erase granularity (sectors of 16 KB and 128 KB) when planning the update strategy.
Connectivity and data converters
The part includes two 12-bit DACs and sixteen 12-bit ADC channels, which cover most analog front-end needs without an external converter. On the digital side, the QSPI interface can map external Flash into the memory space for code execution or data logging, and the EBI/EMI supports parallel SRAM, NOR Flash, or LCD controllers. The USB OTG with on-chip PHY simplifies host/device role switching in field-upgradeable equipment.