STMicroelectronics STM32F100R8T6B

Overview

STM32F100R8T6B from STMicroelectronics is a low-density value-line ARM® Cortex®-M3 microcontroller featuring 64 KB Flash, 8 KB SRAM, 24 MHz max CPU frequency, 12-bit ADC with 16 channels, and dual 12-bit DACs. It integrates up to 8 communication interfaces (3×USART, 2×SPI, 2×I²C, CEC), 12 timers including advanced-control and RTC, and operates from 2.0–3.6 V in industrial temperature range (–40°C to +85°C) for embedded control applications.

For engineers reviewing the STM32F100R8T6B datasheet, STM32F100R8T6B pinout, STM32F100R8T6B application, or STM32F100R8T6B equivalent, key selection criteria include Flash/SRAM size, ADC/DAC resolution and channel count, timer architecture (especially advanced-control timer with dead-time generation), I/O count (51 pins), and LQFP64 package compatibility with existing PCB footprints.

Technical Context

The device implements an ARM Cortex-M3 core with single-cycle multiply and hardware divide, supporting Thumb-2 instruction set and nested vectored interrupt controller (NVIC) for deterministic real-time response. Its clock system includes dual oscillators (8 MHz HSI, 32.768 kHz LSE), PLL for CPU clock scaling, and independent RTC clock domain with calibration.

DMA supports 7 channels with peripheral arbitration for concurrent data transfers across timers, ADC, DAC, USART, SPI, and I²C-enabling efficient sensor acquisition and actuator control without CPU intervention. The memory-mapped peripheral architecture allows direct register access via AHB/APB buses with remappable GPIO functionality.

Key Specifications

Pinout & Package

LQFP64 package: 64-pin, 10 × 10 mm, 0.5 mm pitch, exposed pad optional, RoHS-compliant ECOPACK®.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32F072RBT6 and STM32F103R8T6, the STM32F100R8T6B uniquely balances analog feature density (dual DAC + ADC), motor-control timer capability, and cost-efficiency in LQFP64-making it optimal for resource-constrained embedded systems requiring mixed-signal precision without USB or extreme CPU headroom.

Availability

STM32F100R8T6B is available at Aetrix Electronics and suitable for industrial motor control, smart sensor nodes, home appliance UI controllers, and medical diagnostic interfaces requiring stable component supply across long-lifecycle production programs.

Supply support for STM32F100R8T6B 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 management ICs, sensors, and automotive-grade components since 1987.

The STM32F100 value line targets cost-sensitive, high-volume embedded applications where analog integration, low power, and industrial temperature range are critical-optimized for appliance, industrial automation, and consumer electronics control.

FAQ

What is the maximum operating frequency and corresponding power consumption in Run mode?

The STM32F100R8T6B achieves 24 MHz maximum CPU frequency. At 24 MHz, 3.3 V, and full peripheral enablement, typical Run-mode current is 12.5 mA (measured with code from Flash). This scales linearly with clock frequency and active peripherals-enabling predictable power budgeting for battery or energy-harvesting designs.

Does this MCU support hardware encryption or secure boot features?

No. The STM32F100R8T6B does not include hardware cryptographic accelerators (AES, SHA, PKA) or secure boot ROM. It relies on software-based security measures. For secure firmware updates or data confidentiality, pairing with a dedicated secure element (e.g., STSAFE-A110) is recommended per IEC 62443 design guidelines.

Can the internal 8 MHz RC oscillator be used as the system clock source without external components?

Yes. The factory-trimmed 8 MHz HSI oscillator serves as a ready-to-use clock source with ±1% accuracy over temperature and voltage. It eliminates the need for external crystals during development or in cost-sensitive applications where timing precision <±0.1% is acceptable-such as non-communication control loops.

What debug interfaces are supported, and is JTAG fully available?

The device supports Serial Wire Debug (SWD) and JTAG via dedicated pins (SWDIO, SWCLK, JTCK, JTDI, JTDO, JTMS). However, SWD is the recommended interface: it uses only two pins, occupies less PCB area, and provides full debug functionality-including flash programming, breakpoints, and real-time variable watch-without requiring the full 5-pin JTAG chain.