STMicroelectronics STM32F102R6T6A

Overview

STM32F102R6T6A from STMicroelectronics is a low-density USB access line Arm® Cortex®-M3 microcontroller featuring 32 KB Flash, 6 KB SRAM, USB 2.0 Full-Speed interface, 48 MHz CPU clock, and integrated 12-bit ADC with temperature sensor - deployed in industrial USB peripherals, smart sensors, and embedded control modules requiring compact footprint and USB connectivity.

For engineers reviewing the STM32F102R6T6A datasheet, STM32F102R6T6A pinout, STM32F102R6T6A application, or STM32F102R6T6A equivalent, key selection criteria include USB FS PHY integration, LQFP48 package compatibility, 5 V-tolerant I/O count (37 pins), and real-time clock + backup register support for battery-backed operation.

Technical Context

The STM32F102R6T6A implements an Arm Cortex-M3 core with Harvard bus architecture, single-cycle multiplication, and hardware divide, executing at up to 48 MHz with zero-wait-state Flash access. Its clock system integrates dual oscillators (8 MHz HSI, 4–16 MHz HSE), PLL for CPU/USB clock derivation, and 32 kHz LSE for RTC calibration.

Peripheral interconnect uses AHB/APB2/APB1 buses with NVIC supporting 60 interrupt vectors, DMA controller servicing 7 channels across timers, ADC, USARTs, SPI, and I²C - enabling concurrent USB data transfer, analog acquisition, and serial communication without CPU intervention.

Key Specifications

Pinout & Package

LQFP48 package (7 × 7 mm, 0.5 mm pitch), RoHS-compliant, ECOPACK® certified - suitable for high-density industrial PCB layouts with thermal pad grounding option.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar microcontroller applications.

Compared with STM32F102R6T6A, STM32F072RBT6 offers higher memory density but requires external USB hardware, while STM32F103R6T6A trades USB FS for CAN and DAC - making the F102 optimal for cost-sensitive USB-peripheral designs where PHY integration and low standby power are decisive.

Availability

STM32F102R6T6A is available at Aetrix Electronics and suitable for industrial USB dongles, smart sensor nodes, USB HID peripherals, and embedded power monitors requiring stable component supply across multi-year production cycles.

Supply support for STM32F102R6T6A includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, power ICs, sensors, and analog devices for industrial, automotive, and consumer markets.

The STM32F102x6 product line targets cost-optimized USB-enabled embedded control applications, emphasizing integration of USB FS PHY, low-power modes, and robust analog peripherals in compact packages.

FAQ

Does STM32F102R6T6A support USB device enumeration without external components?

Yes. The part integrates a full-speed USB 2.0 transceiver with internal pull-up resistors on PA11/PA12, enabling plug-and-play enumeration as a USB device (e.g., HID, CDC, MSC) directly from Flash-resident firmware - no external PHY, resistors, or crystals beyond the required 32.768 kHz RTC oscillator.

What is the minimum supply voltage for reliable operation at 48 MHz?

The STM32F102R6T6A requires ≥2.7 V to operate at its maximum 48 MHz frequency with zero wait states. At 2.0–2.6 V, the CPU must be throttled to ≤24 MHz per the datasheet's operating conditions table (Section 5.3.1), and Flash wait states increase to maintain stability.

Can the internal temperature sensor be used for system thermal monitoring?

Yes. The calibrated temperature sensor connects to ADC channel 16 and delivers a linear output (1.42 mV/°C) referenced to VDD. With factory calibration values stored in system memory, it achieves ±1.5°C accuracy across –40°C to 85°C - sufficient for board-level thermal supervision without external sensors.

How many I/O pins support 5 V tolerance, and which ones are they?

37 of the 51 GPIOs are 5 V-tolerant, including all pins in ports A, B, and C except PC13–PC15 (RTC oscillator) and PA11/PA12 (USB D+/D−). This is confirmed in Table 4 (pin definitions) and Section 5.3.13 (I/O port characteristics) of DS5934 Rev 6, enabling direct connection to 5 V logic families.