STM32F103RBT6 128K flash 20K SRAM ARM Cortex-M3 Microcontroller LQFP-64

Description

STM32F103RBT6 128K flash 20K SRAM ARM Cortex-M3 Microcontroller LQFP-64

Key Specifications

Core: ARM® Cortex®-M3 32-bit RISC Core @ 72MHz

1. Memory Configuration

• Flash Memory: 128KB (0x0800 0000 – 0x0801 FFFF)
• SRAM: 20KB (16KB Main + 4KB Core-Coupled Memory)
• Boot Memory: 2KB (System Loader)

2. CPU Performance

• Clock Speed: 72 MHz (zero wait-state execution)
• Instruction Throughput: 1.25 DMIPS/MHz (~90 DMIPS total)
• Hardware FPU: No (use STM32F4 for floating-point)

3. Power Management

• Operating Voltage: 2.0V – 3.6V
• Power Modes:
  • Run: ~36mA @ 72MHz
  • Sleep: ~12mA
  • Stop: ~20µA (RTC active)
  • Standby: ~2µA

4. I/O & Peripherals (LQFP-64)

• GPIO Pins: 51 (of 64 total pins)
• Communication Interfaces:
  • USART: 3x
  • SPI: 2x (18 Mbps)
  • I2C: 2x (400 kHz Fast Mode)
  • USB 2.0 Full-Speed (w/ internal PHY)
  • CAN 2.0B (1x)
• Analog:
  • ADC: 2x 12-bit (1µs conv., 16 channels)
  • DAC: None
• Timers:
  • 16-bit: 4x (PWM/input capture)
  • 32-bit: 2x
  • SysTick, RTC

5. Debug & Programming

• Debug Ports: SWD (2-pin), JTAG (5-pin)
• Boot Modes:
  • Flash (default)
  • System Memory (USB DFU bootloader)
  • SRAM

6. Package Details (LQFP-64)

• Dimensions: 10x10mm, 0.5mm pin pitch
• Pinout:
  • Power: 5x VDD, 5x VSS
  • GPIO: 51x (5V-tolerant except PC13-15)

7. Environmental Ratings

• Temperature Range:
  • Industrial: -40°C to +85°C
  • Extended: -40°C to +105°C
• ESD Protection: >2kV (HBM)

8. Development Ecosystem

• IDEs: Keil, IAR, STM32CubeIDE (free)
• Libraries: STM32Cube HAL/LL, LibOpenCM3
• Common Boards:
  • “Black Pill” (STM32F103RBT6 breakout)
  • STM32 Nucleo (compatible pin headers)

9. Key Applications

• Industrial PLCs
• Motor drives
• USB HID devices
• CAN bus networks
• IoT edge nodes

10. Alternate Part Numbers

• STM32F103R8T6 (64KB Flash)
• STM32F103RET6 (512KB Flash)
• STM32F103C8T6 (64KB, LQFP48)

Design Notes

1. Decoupling: Use 100nF MLCCs on all VDD pins + bulk 4.7µF cap.
2. NRST: 10kΩ pull-up + 100nF capacitor required.
3. Boot Pins: BOOT0 must be externally pulled low (10kΩ recommended).
4. USB DP: Requires 1.5kΩ pull-up to 3.3V.