ARM Cortex-M3 at 48 MHz — 64-LQFP integration
The STM32F102RBT6 is an ARM Cortex-M3 32-bit MCU clocked at 48 MHz, packing 128 KB of flash and 16K x 8 of SRAM into a 64-LQFP package with 51 accessible I/O lines. The 0.5 mm pitch LQFP-64 footprint demands a 4-layer board for clean fan-out of the inner rows — two-layer designs will struggle to route the full I/O set without vias.
128 KB flash, 16 KB SRAM — memory budget for control apps
128 KB of on-chip flash (128K x 8) holds the application image; after a lightweight RTOS and HAL, expect roughly 80–90 KB free for the control loop and communication stack. 16K x 8 of SRAM covers the stack, heap, and DMA buffers — enough for a USB CDC class or a modest Modbus RTU slave, but tight for a full TCP/IP stack without external RAM. The 48 MHz Cortex-M3 delivers 1.25 DMIPS/MHz, giving about 60 DMIPS of integer throughput — sufficient for real-time control loops in motor drives, sensor fusion, or industrial I/O modules.
Supply range 2.0–3.6 V, industrial temp -40 to +85°C
On-chip peripherals include DMA, POR, PVD, PWM, a temperature sensor, and a watchdog timer — the POR and PVD eliminate external supervisor ICs for brown-out protection.
Connectivity and analog — USB, I²C, SPI, 16-ch 12-bit ADC
A 16-channel 12-bit ADC samples analog sensors or potentiometers; the 12-bit resolution gives 4096 counts across the reference voltage, suitable for 0–10 V scaled inputs with a voltage divider. 51 I/O pins on the 64-LQFP package leave headroom for a parallel LCD interface, keypad matrix, and several status LEDs alongside the serial buses.
Active lifecycle, ROHS3 compliant — design-in ready
ROHS3 compliant, with no REACH or conflict-mineral restrictions flagged in the standard compliance package.