72 MHz Cortex-M3 with 1 MB Flash — the high-density STM32F103
It packs 112 I/O lines, a full set of connectivity peripherals including CANbus, USB, SPI, I²C, and multiple UART/USART channels, plus a 21-channel 12-bit ADC and a 2-channel 12-bit DAC. This is the high-density variant of the STM32F103 line, suited for applications requiring substantial code space and I/O count — motor drives, PLCs, industrial HMI, and multi-protocol gateway designs where the CAN and USB interfaces eliminate external bridge chips.
1 MB Flash and 96 KB SRAM — firmware headroom for complex stacks
With 1 MB of Flash, this MCU can hold a full RTOS kernel, TCP/IP stack, USB device/host stack, and a CANopen or J1939 protocol layer simultaneously, leaving room for application code. The 96 KB SRAM supports moderate data buffering — enough for a 64 KB Ethernet or USB packet buffer with 32 KB left for stack and variables. Designs that need larger dynamic memory should budget an external SRAM or SDRAM on the FSMC bus, which this package variant supports via the 144-pin count.
112 I/O and rich peripheral set — one-chip system integration
The 112 I/O lines in the 144-LQFP footprint give the designer room to connect parallel LCD data buses, multiple encoder inputs, and a bank of discrete sensors without an I/O expander. The integrated CANbus, USB, SPI, I²C, and UART peripherals cover the common industrial communication interfaces. The motor control PWM timer with complementary outputs and dead-time insertion is built in, so an external PWM controller is not needed for three-phase BLDC or PMSM drives. The 21-channel 12-bit ADC can sample current and voltage feedback from all three motor phases plus auxiliary channels in a single conversion cycle.
Active lifecycle — no last-time-buy risk
STMicroelectronics continues to manufacture this part, so there is no last-time-buy deadline or obsolescence-driven redesign pressure.