STMicroelectronics STM32F100C6T6BTR

Overview

STM32F100C6T6BTR from STMicroelectronics is a 32-bit ARM® Cortex®-M3 microcontroller with 32 KB Flash, 4 KB SRAM, 24 MHz max CPU frequency, 1×12-bit ADC (16-channel), and 2×12-bit DACs - used in industrial sensor nodes, motor control interfaces, and low-power HMI modules.

For engineers reviewing the STM32F100C6T6BTR datasheet, STM32F100C6T6BTR pinout, STM32F100C6T6BTR application, or STM32F100C6T6BTR equivalent, key selection criteria include Flash/SRAM size, ADC/DAC resolution and channel count, I/O count (37 pins), and LQFP48 package compatibility for space-constrained PCB layouts.

Technical Context

The device implements an ARM Cortex-M3 core with single-cycle multiplication and hardware division, supporting deterministic real-time execution. Its clock system integrates a 4–24 MHz external crystal oscillator, 8 MHz factory-trimmed internal RC, and PLL for scalable CPU clock generation up to 24 MHz.

Peripherals include seven DMA channels servicing timers, ADC, SPI, I²C, USART, and DACs; two watchdog timers (independent and window); and a 24-bit SysTick timer. The RTC operates from VBAT with calibration support and backup registers for persistent state retention.

Key Specifications

Pinout & Package

LQFP48 package (7 × 7 mm, 0.5 mm pitch), RoHS-compliant, ECOPACK® certified.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32F030F4P6, this part delivers higher analog integration and deterministic M3 execution; versus STM32F103C6T6, it trades raw speed for built-in DACs and lower power consumption - ideal for mixed-signal edge nodes where analog output and energy efficiency are critical.

Availability

STM32F100C6T6BTR is available at Aetrix Electronics and suitable for industrial sensor nodes, motor control interfaces, and smart home thermostats requiring stable component supply across long-lifecycle designs.

Supply support for STM32F100C6T6BTR 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, specializing in microcontrollers, power management, and automotive-grade ICs.

This device belongs to the STM32F100 value line - designed specifically for cost-sensitive, low-power embedded applications requiring balanced performance, analog integration, and industrial temperature range operation (–40°C to +85°C).

FAQ

What is the maximum operating frequency of the STM32F100C6T6BTR?

The STM32F100C6T6BTR operates at a maximum CPU frequency of 24 MHz, achieved using its internal PLL driven by either the 4–24 MHz external crystal oscillator or the 8 MHz internal RC oscillator. This frequency is fixed by design - unlike higher-density STM32F103 variants, it does not support scaling beyond 24 MHz due to Flash wait-state and voltage constraints.

Does this MCU support USB or Ethernet connectivity?

No, the STM32F100C6T6BTR does not include USB or Ethernet peripherals. It provides up to eight communication interfaces: up to two I²C, three USART, two SPI, and one CEC port. For USB connectivity, designers must use external USB-to-UART bridges or select higher-series parts like STM32F105/F107 or STM32F4xx families with native USB OTG support.

Can the internal 8 MHz RC oscillator be used as the system clock source?

Yes, the internal 8 MHz factory-trimmed RC oscillator can serve as the system clock source without external components. It achieves ±1% accuracy over temperature and voltage ranges, making it suitable for non-critical timing applications such as UART communication at standard baud rates or general-purpose control loops where crystal-level precision is unnecessary.

What is the purpose of the VBAT pin, and how is it used in practice?

The VBAT pin supplies power to the RTC and 42 backup registers during main power loss. When connected to a coin-cell battery (e.g., CR1220), it maintains real-time clock operation and preserves critical configuration data across power cycles. The device supports VBAT voltages from 1.8 V to 3.6 V, and automatic switchover occurs when VDD drops below the VBAT threshold, ensuring uninterrupted timekeeping and state retention.