STMicroelectronics STM32F100VBT7B

Overview

STM32F100VBT7B from STMicroelectronics is an ARM® Cortex®-M3 32-bit microcontroller in LQFP100 package, operating up to 24 MHz with 128 KB Flash and 8 KB SRAM. It integrates dual 12-bit DACs, a 12-bit 1.2 µs ADC (16-channel), 12 timers including advanced-control and basic types, and eight communication interfaces (3×USART, 2×SPI, 2×I²C, CEC). It serves as the main control unit in industrial sensor nodes requiring analog signal conditioning, real-time PWM motor control, and multi-protocol serial connectivity.

For engineers reviewing the STM32F100VBT7B datasheet, STM32F100VBT7B pinout, STM32F100VBT7B application, or STM32F100VBT7B equivalent, key selection criteria include its 100-pin LQFP footprint, 24 MHz CPU clock with hardware division, 5 V-tolerant I/Os (up to 80 pins), RTC with VBAT backup, and SWD/JTAG debug support for embedded firmware development.

Technical Context

The device implements a nested vectored interrupt controller (NVIC) supporting up to 68 interrupts with programmable priority levels, enabling deterministic real-time response in closed-loop control systems. Its clock tree includes dual oscillators (8 MHz HSI ±1%, 32.768 kHz LSE), PLL for CPU clock derivation, and independent 40 kHz LSI for watchdog timing - all configurable via RCC registers.

DMA operation supports 7 channels with peripheral request mapping to timers, ADC, DAC, SPI, I²C, and USART; each channel features memory-to-memory, memory-to-peripheral, and peripheral-to-memory transfer modes with configurable data width and burst size.

Key Specifications

Pinout & Package

LQFP100 package: 14 × 14 mm body, 0.5 mm pitch, exposed thermal pad (EP), RoHS-compliant ECOPACK®.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32F100VBT7B, the STM32F072RBT6 trades analog capability for lower cost and simpler toolchain support, while the STM32F103VBT6 offers higher clock speed at the expense of RTC battery backup - making the STM32F100VBT7B optimal for low-power, analog-rich edge nodes needing persistent timekeeping.

Availability

STM32F100VBT7B is available at Aetrix Electronics and suitable for industrial sensor nodes, smart HVAC actuators, PLC I/O modules, and medical infusion pump controllers requiring stable component supply across long-lifecycle deployments.

Supply support for STM32F100VBT7B 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, low-power embedded applications demanding rich analog integration and real-time control - optimized for industrial automation, building controls, and portable medical devices.

FAQ

What is the maximum operating frequency and associated power consumption of the STM32F100VBT7B?

The STM32F100VBT7B operates at up to 24 MHz with typical active current of 12.5 mA at 3.3 V and 24 MHz (code from Flash, peripherals enabled). At 8 MHz, active current drops to ~5.2 mA under identical conditions. These values are measured per Section 5.3.5 of the datasheet and assume VDD = 3.3 V, ambient temperature 25 °C, and standard I/O loading.

Does the STM32F100VBT7B support hardware floating-point operations?

No, the STM32F100VBT7B uses the ARM Cortex-M3 core without an integrated FPU. Floating-point calculations must be performed in software using the standard C library or CMSIS-DSP routines. Its 24 MHz clock and 1.25 DMIPS/MHz rating provide sufficient integer throughput for most fixed-point control algorithms in motor and sensor applications.

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 is fully functional as the system clock source with ±1% accuracy at 25 °C and 3.3 V. It requires no external crystal or capacitors and supports immediate startup after reset, making it ideal for rapid boot sequences or fail-safe fallback when external oscillators fail.

How many of the GPIO pins are 5 V-tolerant, and which ones are excluded?

All 80 GPIO pins are 5 V-tolerant except those designated for analog functions: PA0–PA7 (ADC1_IN0–IN7), PB0–PB1 (ADC1_IN8–IN9), and PC0–PC5 (ADC1_IN10–IN15). These analog input pins must remain within the VDDA voltage range (2.0–3.6 V) and cannot tolerate 5 V signals, even when configured as digital inputs.