STMicroelectronics STM32F100CBT6B

Overview

STM32F100CBT6B from STMicroelectronics is a low- to medium-density value-line ARM® Cortex®-M3 microcontroller featuring 128 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-including 3 USARTs, 2 I²C, 2 SPI, and CEC-and supports industrial motor control, sensor node processing, and USB-powered embedded instrumentation.

For engineers reviewing the STM32F100CBT6B datasheet, STM32F100CBT6B pinout, STM32F100CBT6B application, or STM32F100CBT6B equivalent, key selection criteria include Flash/SRAM size, 5 V-tolerant I/O count (up to 51 pins), real-time clock with VBAT backup, SWD/JTAG debug support, and low-power Stop/Standby modes for battery-constrained designs.

Technical Context

The STM32F100CBT6B implements an ARM Cortex-M3 core with single-cycle multiply and hardware divide, executing at up to 24 MHz (1.25 DMIPS/MHz). Its clock system includes a 4–24 MHz external crystal oscillator, factory-trimmed 8 MHz RC, 40 kHz RC, PLL for CPU clock scaling, and dedicated 32 kHz RTC oscillator with calibration.

It features a 7-channel DMA controller servicing timers, ADC, SPI, I²C, USART, and DAC peripherals; nested vectored interrupt controller (NVIC) with 64 interrupts; and memory-mapped peripherals including CRC calculation unit and 96-bit unique ID. Power management supports Sleep, Stop, and Standby modes with VBAT-backed RTC and backup registers.

Key Specifications

Pinout & Package

LQFP64 package (10 × 10 mm, 0.5 mm pitch), RoHS-compliant, ECOPACK® certified. Pin count and function mapping align with STM32F100xB series LQFP64 mechanical specification (DocID16455 Rev 9, Section 6.2).

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32F072CBT6, the STM32F100CBT6B offers superior analog integration and CEC support at lower clock speed; versus STM32F103C8T6, it trades peak performance for smaller code footprint, integrated RTC calibration, and consumer electronics interface readiness.

Availability

STM32F100CBT6B is available at Aetrix Electronics and suitable for industrial motor control, smart sensor nodes, USB-powered test instruments, and home automation controllers requiring stable component supply across long-lifecycle deployments.

Supply support for STM32F100CBT6B 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 semiconductors since 1987.

The STM32F100 value line targets cost-sensitive, resource-constrained embedded applications requiring robust analog integration, low-power operation, and industrial-grade reliability - optimized for appliance control, sensor hubs, and consumer electronics peripherals.

FAQ

What is the maximum operating frequency and associated power consumption?

The STM32F100CBT6B operates at up to 24 MHz. At 24 MHz and 3.3 V, typical active-mode current is 12.5 mA (code from Flash, peripherals enabled); in Stop mode with RTC active, it drops to 3.5 µA. These values are measured per datasheet conditions (DocID16455 Rev 9, Table 15 and 16) and validated across the industrial temperature range.

Does this MCU support USB connectivity?

No, the STM32F100CBT6B does not include a USB peripheral. It supports UART (with IrDA/LIN/ISO 7816), I²C, SPI, and CEC for wired and consumer electronics communication. For USB host/device functionality, ST recommends the STM32F103 or STM32F072 series, which integrate USB 2.0 FS controllers.

How many I/O pins are 5 V tolerant, and what is the safe input voltage range?

All 51 GPIO pins on the STM32F100CBT6B are 5 V tolerant when configured in input, output, or alternate function modes. The absolute maximum input voltage is 5.5 V, and the functional high-level input threshold is 0.7 × VDD (min) - verified per datasheet Section 5.3.13 and Table 34.

Is the internal temperature sensor calibrated, and what is its accuracy?

Yes, the internal temperature sensor is factory-calibrated and specified for ±1.5°C accuracy over –40 to +85°C (DocID16455 Rev 9, Table 47). It connects to ADC channel 16 and requires software compensation using two-point calibration constants stored in system memory.