STMicroelectronics STM32F100RDT7B

Overview

STM32F100RDT7B from STMicroelectronics is a high-density value-line Arm® Cortex®-M3 MCU with 384 KB Flash, 32 KB SRAM, 24 MHz max CPU frequency, dual 12-bit DACs, and 16-channel 12-bit ADC - deployed in industrial motor control interfaces requiring real-time PWM generation, analog sensing, and serial communication.

For engineers reviewing the STM32F100RDT7B datasheet, STM32F100RDT7B pinout, STM32F100RDT7B application, or STM32F100RDT7B equivalent, key selection criteria include Flash/SRAM sizing for firmware+buffering, DAC/ADC resolution for closed-loop analog I/O, timer count and advanced-control capability for multi-phase motor drive, and LQFP64 package compatibility with space-constrained PCB layouts.

Technical Context

The device implements a nested vectored interrupt controller (NVIC) supporting up to 68 interrupts with programmable priority, and integrates a flexible static memory controller (FSMC) with four chip selects for external SRAM, PSRAM, or NOR flash expansion. Its clock system combines a 4–24 MHz HSE crystal oscillator, factory-trimmed 8 MHz HSI RC, and 40 kHz LSI RC, feeding a PLL that scales CPU frequency to 24 MHz.

DMA operation supports concurrent transfers across 12 channels for peripherals including timers, ADC, SPI, I²C, USART, UART, and DAC - enabling zero-CPU-overhead data movement during sensor acquisition, waveform generation, and communication buffering.

Key Specifications

Pinout & Package

LQFP64 package (10 × 10 mm, 0.5 mm pitch), RoHS-compliant, rated for industrial temperature range (–40 °C to +85 °C).

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32F072RBT6, the STM32F100RDT7B offers superior analog subsystem depth and external memory capability; compared with STM32F303RCT7, it trades FPU and op-amps for lower BOM cost and proven industrial qualification - making it optimal for cost-sensitive, analog-rich embedded control where Cortex-M3 determinism suffices.

Availability

STM32F100RDT7B is available at Aetrix Electronics and suitable for industrial motor control, smart energy metering, PLC I/O modules, and medical infusion pump controllers requiring stable component supply across long-lifecycle production programs.

Supply support for STM32F100RDT7B 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 industrial and consumer applications requiring robust analog integration, real-time control, and extended product lifecycle - balancing performance, peripheral richness, and price for volume deployments.

FAQ

What is the maximum operating frequency and core architecture of the STM32F100RDT7B?

The STM32F100RDT7B uses an Arm Cortex-M3 core with a maximum CPU frequency of 24 MHz, delivering 1.25 DMIPS per MHz. It does not support dynamic frequency scaling beyond this limit, and its instruction set includes single-cycle multiplication and hardware division - optimized for deterministic real-time control tasks without runtime overhead.

Does the STM32F100RDT7B support external memory expansion?

Yes, it integrates a Flexible Static Memory Controller (FSMC) with four chip-select outputs supporting asynchronous and synchronous SRAM, PSRAM, and NOR flash devices. This enables expansion of data buffers and code storage beyond on-chip Flash and SRAM limits - verified in ST's AN2786 and RM0041 reference manual sections.

How many analog-to-digital and digital-to-analog converter channels does it provide?

The device includes one 12-bit ADC with up to 16 input channels and two 12-bit DACs with buffered outputs. The ADC supports hardware oversampling and injected channel sequencing; DAC outputs are independently configurable and can be triggered by timers or software - confirmed in DS5944 Section 2.2.25 and 2.2.26.

Is the STM32F100RDT7B pin-compatible with other STM32F100xx variants in LQFP64?

Yes, all STM32F100x D-series parts in LQFP64 (e.g., STM32F100RDT6, STM32F100RBT6) share identical pinouts and mechanical footprint. Differences lie only in Flash size (384 KB vs 128 KB), SRAM (32 KB vs 16 KB), and peripheral enablement - allowing drop-in replacement within the same density grade without PCB redesign.