STM32F100C8T6B ST Mainstream Arm Cortex-M3 Value Line 32-bit MCU 64KB Flash 24MHz CPU 12-bit ADC DAC LQFP-48

STM32F100C8T6B Product Overview

The STM32F100C8T6B is a mainstream Arm Cortex-M3 value line MCU from STMicroelectronics, LQFP-48 package (7×7×1.4 mm). 24 MHz Cortex-M3 core, 64 KB Flash, 8 KB SRAM. Integrates 12-bit ADC (10 channels, 1.2 µs), 12-bit DAC (2 channels), 2 analog comparators, HDMI CEC, 7-channel DMA (supporting timers, ADC, SPI, I2C, USART, DAC), up to 12 timers (1×16-bit 6-ch advanced-control/PWM/deadtime/emergency stop, up to 3×16-bit GP/IC/OC/PWM, 2×16-bit basic timers for DAC, independent/window WDG, 24-bit SysTick), up to 2×I2C (SMBus/PMBus), up to 3×USART (ISO 7816/LIN/IrDA/modem control), up to 2×SPI (12 Mbit/s). 37 I/Os (all mappable on 16 external interrupt vectors, almost all 5V-tolerant). VDD 2.0 V–3.6 V, -40 °C to 85 °C, ECOPACK®2.

STM32F100C8T6B Core Features

Core: Arm Cortex-M3 24 MHz, 1.25 DMIPS/MHz, single-cycle multiplication/hardware division, SWD & JTAG debug Memory: 64 KB Flash, 8 KB SRAM, CRC, 96-bit unique ID 12-bit ADC: 10 channels, 1.2 µs, 0–3.6 V, temperature sensor 12-bit DAC: 2 channels, buffered output HDMI CEC: Consumer electronics control interface 7-ch DMA: Supporting timers, ADC, SPI, I2C, USART, DAC Up to 12 Timers: 1×16-bit 6-ch advanced-control/PWM/deadtime/emergency stop, up to 3×16-bit GP/IC/OC/PWM/pulse counter, 2×16-bit basic timers (for DAC), independent/window WDG, 24-bit SysTick Communication: Up to 2×I2C (SMBus/PMBus), up to 3×USART (ISO 7816/LIN/IrDA/modem control), up to 2×SPI (12 Mbit/s) Low Power: Sleep/Stop/Standby, VBAT for RTC and backup registers Clock: 4–24 MHz XTAL, 32 kHz RTC XTAL (calibrated), 8 MHz RC (factory-trimmed), 40 kHz RC, PLL I/Os: 37 fast I/Os, all mappable on 16 ext. interrupt vectors, almost all 5V-tolerant Supply/Temp: VDD 2.0 V–3.6 V, POR/PDR/PVD, -40 °C to 85 °C Package: LQFP-48 (7×7×1.4 mm), Tray

STM32F100C8T6B Applications

Industrial: PLCs, sensor transmitters, inverters, printers Motor Control: Fans, pumps, small motors (6-ch PWM/deadtime/emergency stop) Consumer: Remote controls, handhelds, PC peripherals, GPS platforms, gaming peripherals Medical: Handheld medical terminals Home Appliances: Panels, HVAC, alarms, video intercoms Security: Access control, alarms, smoke detectors IoT: Wireless sensors, environmental monitoring, smart home LED Lighting: Dimming, RGB strips, SMPS

STM32F100C8T6B Key Advantages

Arm Cortex-M3 Core: 24 MHz, 1.25 DMIPS/MHz, single-cycle multiplication/hardware division, far exceeding Cortex-M0 performance at same frequency 64 KB Flash + 8 KB SRAM: For medium-complexity applications 12-bit ADC + 12-bit DAC (2-ch) + Dual Comparators: Complete analog signal chain without external analog ICs 12-bit DAC (2-ch): Buffered output, rare in this class HDMI CEC: For digital TV, A/V receivers, and consumer electronics 7-ch DMA: Direct peripheral-to-memory transfers, offloads CPU 12 Timers: Advanced-control/PWM/deadtime/emergency stop + multiple GP timers + basic timers for DAC 2×I2C + 3×USART + 2×SPI: Rich communication peripherals for multi-bus connectivity Calendar RTC: VBAT backup, ideal for scheduled sensing and low-power applications Mature STM32 Ecosystem: CubeIDE/CubeMX/HAL/LL libraries, abundant development boards and reference designs Cost-Effective Value Line: 32-bit ARM + ADC + DAC + capacitive touch, ideal upgrade from 8/16-bit MCUs

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FAQ:

1. What is the STM32F100C8T6B and how does it differ from the popular STM32F103C8T6?
   The STM32F100C8T6B is a 24 MHz Arm Cortex‑M3 microcontroller with 64 KB Flash and 8 KB SRAM in an LQFP‑48 package. It belongs to the STM32F100 “Value Line,” designed to bring 32‑bit performance to cost‑sensitive applications. Compared to the STM32F103C8T6 (72 MHz, CAN, USB, 20 KB SRAM), the F100 runs at a lower clock speed, omits CAN and USB, and has a smaller SRAM. In return, it offers a significantly lower price and reduced power consumption, plus a 12‑bit DAC that most F103 variants lack. The “B” suffix indicates a refined silicon revision.

2. Is 64 KB Flash and 8 KB SRAM really enough for a real‑time application? How do I optimize for this memory?
   Absolutely, for focused, well‑optimized tasks. Bare‑metal applications such as simple motor controllers, sensor hubs, or home automation nodes can fit easily in 64 KB. The 8 KB SRAM requires careful buffer management—use DMA for serial transfers, store constants in Flash, and avoid large static arrays. Many proven designs run comfortably in this space. If your firmware outgrows these limits, the pin‑compatible STM32F103C8T6 provides 20 KB SRAM and 72 MHz as a direct upgrade.

3. Why would I choose the STM32F100C8T6B over an 8‑bit MCU or a newer STM32G0 series chip?
   You choose the F100C8T6B when you need a mature, proven 32‑bit Cortex‑M3 architecture with extensive community support, long‑term availability, and a built‑in DAC at a very low cost. Compared to an 8‑bit MCU, the Cortex‑M3 core provides far more processing headroom and better C/C++ development efficiency. Compared to the newer STM32G0 series, the F100 is often more cost‑effective for designs that do not need USB‑PD, advanced analog features, or ultra‑low power modes. If your firmware is already written for the STM32F1 ecosystem, the F100 is a low‑risk, drop‑in choice.

4. Does the STM32F100C8T6B have a DAC? How is its analog capability better than the F103?
   Yes, the STM32F100C8T6B includes two 12‑bit DAC channels, which are absent on most STM32F103 models. This makes the F100C8T6B an excellent choice for applications needing analog voltage outputs—waveform generation, sensor excitation, or audio playback—without adding an external DAC. Combined with a 10‑channel 12‑bit ADC, the F100 delivers a strong mixed‑signal front‑end at a very low price.

5. What low‑power modes does the STM32F100C8T6B support, and can it run from a battery?
   The chip supports Sleep, Stop, and Standby modes. In Stop mode with the main regulator off and all 8 KB SRAM retained, the typical current is around 14 µA. The 24 MHz clock and the Value Line’s power‑optimized design contribute to very low dynamic power. This makes the F100C8T6B a solid choice for battery‑powered sensors and portable instruments that sleep most of the time and wake periodically to acquire and transmit data.

6. Can I perform over‑the‑air (OTA) firmware updates with the 64 KB single‑bank Flash?
   Yes, with a small bootloader (4–8 KB) and a compact application. The 8 KB SRAM can buffer small firmware chunks received via USART or SPI, and the update is performed sector‑by‑sector. An A/B update scheme is not practical; a download‑and‑overwrite approach with CRC verification is recommended. For more comfortable OTA headroom, the pin‑compatible STM32F103C8T6 (64 KB Flash, but with 20 KB SRAM) provides a larger buffer.

7. Is 24 MHz fast enough? Will I miss the 72 MHz of an F103?
   For most simple control and communication tasks, 24 MHz is more than adequate. It handles UART, SPI, I2C at standard baud rates, ADC sampling at several hundred ksps, and PID loops with ease. The Cortex‑M3 at 24 MHz still outperforms most 8‑ and 16‑bit MCUs. You will only feel the speed limitation with complex DSP, high‑speed communication, or a full TCP/IP stack. For everything else, the F100 delivers a responsive experience with lower power and cost.

8. What development tools and libraries support the STM32F100C8T6B? Is it compatible with STM32F103 code?
   The F100C8T6B is fully supported by STM32CubeIDE, Keil MDK, and IAR EWARM. It uses the same STM32F1 HAL/LL libraries as the F103 series. Code written for the F103 can be ported to the F100 with minimal changes—mainly adjusting the system clock to 24 MHz and removing references to USB and CAN. The Arduino IDE also supports the STM32F100 through the “STM32duino” core, enabling rapid prototyping.

9. What are the most typical applications for the STM32F100C8T6B?
   It is widely used in home appliances, simple motor drives, smart sensors, power tools, and cost‑sensitive industrial controllers. Any application that needs a reliable 32‑bit core with a DAC, basic serial communication, and a compact 48‑pin footprint at the lowest possible cost is a strong fit for the F100C8T6B. Its Value Line positioning makes it a favorite for high‑volume, price‑conscious products.

10. Does the STM32F100C8T6B have USB or CAN? What if I need them?
    No, the F100C8T6B has no USB or CAN controller. If your design requires USB, you can add an external SPI‑to‑USB bridge chip or move to the pin‑compatible STM32F103C8T6. For CAN, an external SPI‑to‑CAN controller (e.g., MCP2515) or the STM32F103C8T6 is the solution. The F100 is optimized for applications that only need basic serial communication and analog I/O.