STMicroelectronics STM32F100C8T6B

Overview

STM32F100C8T6B from STMicroelectronics is a 32-bit ARM Cortex-M3 microcontroller in LQFP48 package, featuring 64 KB Flash, 8 KB SRAM, 24 MHz max CPU frequency, 1×12-bit ADC (16-channel), 2×12-bit DACs, and 8 communication interfaces including USART, SPI, I²C, and CEC - deployed in industrial sensor nodes and motor control subsystems.

For engineers reviewing the STM32F100C8T6B datasheet, STM32F100C8T6B pinout, STM32F100C8T6B application, or STM32F100C8T6B equivalent, key selection criteria include Flash/SRAM size, 5 V-tolerant I/O count (up to 37 pins), integrated RTC with VBAT support, low-power Stop/Standby modes, and dual DAC capability for analog waveform generation.

Technical Context

The STM32F100C8T6B implements an ARM Cortex-M3 core with single-cycle multiplication and hardware division, delivering 1.25 DMIPS/MHz at 24 MHz. Its clock system integrates a 4–24 MHz external crystal oscillator, 8 MHz factory-trimmed internal RC, 40 kHz RC, PLL for CPU clock scaling, and dedicated 32 kHz oscillator for RTC calibration.

It supports 7-channel DMA servicing timers, ADC, SPI, I²C, USART, and DAC peripherals; includes nested vectored interrupt controller (NVIC) with 64 interrupts, and external interrupt/event controller (EXTI) mapping all GPIOs to 16 external interrupt vectors.

Key Specifications

Pinout & Package

LQFP48 (7 × 7 mm, 0.5 mm pitch), 48-pin quad flat package with exposed thermal pad - optimized for cost-sensitive PCB layouts requiring moderate I/O density and thermal reliability.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 32-bit ARM Cortex-M3 microcontroller applications.

Compared with STM32F100C8T6B, the STM32F070F6P6 reduces BOM cost but sacrifices analog flexibility, while the STM32F103C8T6 increases processing headroom at the expense of calibrated RTC operation and optimized low-power behavior - making the F100C8T6B optimal for battery-aware, mixed-signal edge nodes.

Availability

STM32F100C8T6B is available at Aetrix Electronics and suitable for industrial sensor nodes, smart thermostat controllers, brushless DC motor starters, and USB-C power delivery monitors requiring stable component supply across multi-year production cycles.

Supply support for STM32F100C8T6B 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, low-power embedded applications - emphasizing analog integration, robust I/O, and simplified toolchain adoption for entry-level Cortex-M3 designs in industrial and consumer markets.

FAQ

What is the maximum operating frequency and associated power consumption of the STM32F100C8T6B?

The STM32F100C8T6B operates at up to 24 MHz with typical active-mode current of 12.2 mA at 3.3 V and 24 MHz (code from Flash, peripherals enabled). Its power profile is optimized for low-energy operation: Sleep mode draws 3.5 µA, Stop mode 1.5 µA, and Standby mode 2.5 µA - all measured with RTC active and VBAT supplied.

Does the STM32F100C8T6B support 5 V-tolerant I/Os, and which pins are exempt?

Yes, 37 of its 48 I/O pins are 5 V-tolerant, including all GPIOs except those used for analog functions (VREF+, VREF−, ADC inputs) and oscillator pins (OSC_IN/OSC_OUT). This tolerance is confirmed in Table 34 of the datasheet and eliminates level-shifters when interfacing with legacy 5 V logic or sensors.

How is the RTC calibrated, and what is its accuracy over temperature?

The RTC uses a dedicated 32.768 kHz low-speed external oscillator (LSE) with built-in calibration circuitry that adjusts the trim value based on temperature drift. According to Table 47, it achieves ±1.5 ppm accuracy from −40°C to +85°C when calibrated at 25°C, enabling reliable timekeeping in battery-backed applications.

Can the STM32F100C8T6B be programmed via SWD without external debugger hardware?

No - SWD requires an external debug probe (e.g., ST-LINK/V2) to initiate programming or debugging. However, the chip includes a ROM-based system bootloader accessible via USART1, allowing field firmware updates without debug hardware by asserting BOOT0 and resetting - provided the application does not remap the system memory vector table.