The STM32F439ZIT6 is a 32-bit ARM Cortex-M4 MCU from STMicroelectronics' STM32F4 series, clocked at 180 MHz with a hardware FPU and DSP instruction set. Program memory is 2 MB of Flash, sized for a full Ethernet TCP/IP stack, a FreeRTOS kernel, and a graphical LCD framebuffer without external memory. The 256 KB SRAM supports double-buffered DMA transfers between the Ethernet MAC and the LCD controller, so the core is not stalled by peripheral data movement. Connectivity includes Ethernet MAC, two CAN interfaces, USB OTG, multiple SPI and I²C buses, and an EBI/EMI memory controller for external SRAM or NAND Flash. The 114 general-purpose I/Os are enough to interface a parallel TFT display, a keypad matrix, and a dozen sensors without an I/O expander.
24 analog inputs and dual DACs — what the converter specs mean for signal chain accuracy
The internal oscillator handles UART and I²C timing. For the ADC clock, an external crystal with PLL is recommended.