STMicroelectronics STM32F100RET6B

Overview

STM32F100RET6B from STMicroelectronics is a high-density value-line Arm® Cortex®-M3 microcontroller featuring 512 KB Flash, 32 KB SRAM, 24 MHz max CPU frequency, dual 12-bit DACs, and up to 112 I/Os - deployed in industrial HMI panels requiring real-time sensor interface, local display control, and multi-protocol connectivity.

For engineers reviewing the STM32F100RET6B datasheet, STM32F100RET6B pinout, STM32F100RET6B application, or STM32F100RET6B equivalent, key selection criteria include Flash/SRAM capacity, 12-bit ADC/DAC resolution and speed, LQFP64 package compatibility, and integrated FSMC for external memory expansion in cost-sensitive embedded control designs.

Technical Context

The STM32F100RET6B implements an Arm Cortex-M3 core with Harvard architecture, single-cycle multiply/hardware divide, and nested vectored interrupt controller (NVIC) supporting up to 68 interrupts. Its clock tree integrates four oscillators: 4–24 MHz HSE, 32.768 kHz LSE, 8 MHz HSI, and 40 kHz LSI - enabling precise RTC calibration and flexible low-power mode transitions.

Peripheral subsystems include a flexible static memory controller (FSMC) with four chip selects for SRAM/PSRAM/NOR, LCD parallel interface (8080/6800 modes), and 11 communication interfaces - notably three USARTs with LIN/IrDA/ISO 7816 support, two I²C buses, three SPIs (12 Mbit/s), and CEC - all mapped to GPIOs with full remapping capability and 5 V-tolerant inputs on most pins.

Key Specifications

Pinout & Package

LQFP64 (10 × 10 mm, 0.5 mm pitch) package with exposed thermal pad; RoHS-compliant, 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 STM32F100RET6B offers superior analog integration and memory bandwidth; versus STM32F103RET6, it trades SRAM headroom for built-in DACs and lower-cost qualification - making it optimal for cost-conscious, analog-rich industrial controls.

Availability

STM32F100RET6B is available at Aetrix Electronics and suitable for industrial HMI panels, smart energy meters, medical patient monitors, and automotive body control modules requiring stable component supply across multi-year production cycles.

Supply support for STM32F100RET6B 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 devices, sensors, and analog ICs for industrial, automotive, and consumer markets.

The STM32F100 value line targets cost-sensitive, high-volume embedded applications demanding rich peripheral sets - especially where analog interface (ADC/DAC), memory expansion (FSMC), and low-power operation are essential design constraints.

FAQ

What is the maximum operating frequency and associated performance metric?

The STM32F100RET6B operates at a maximum CPU frequency of 24 MHz, delivering 1.25 DMIPS per MHz (30 DMIPS total) under Dhrystone 2.1 benchmark conditions. This performance level supports real-time scheduling of multiple concurrent tasks - such as sensor polling, display refresh, and communication protocol handling - within tight timing budgets typical of industrial control loops.

Does this MCU support external memory expansion, and what types are compatible?

Yes, the STM32F100RET6B integrates a Flexible Static Memory Controller (FSMC) with four chip select outputs. It supports asynchronous and synchronous SRAM, PSRAM, and NOR flash memories in non-multiplexed and multiplexed configurations. The controller handles address/data demultiplexing, wait-state insertion, and timing parameter configuration - enabling direct connection of external displays, data loggers, or firmware storage without external glue logic.

How many analog-to-digital and digital-to-analog converters does it include?

The STM32F100RET6B features one 12-bit, 1.2 µs ADC with up to 16 input channels and two independent 12-bit DACs. The ADC supports hardware-triggered conversions, injected channel sequencing, and integrated temperature sensor readout. Each DAC provides buffered voltage output with configurable trigger sources - enabling simultaneous analog signal generation and acquisition for closed-loop control applications like motor biasing or sensor calibration.

What debug interface is supported, and what are its physical requirements?

The STM32F100RET6B supports Serial Wire Debug (SWD), a 2-pin ARM-standard interface using SWDIO (bidirectional data) and SWCLK (clock). No JTAG pins are required. SWD enables full debugging capabilities - including flash programming, real-time register inspection, and hardware breakpoints - with minimal PCB footprint and reduced signal integrity complexity compared to full JTAG. A 10-pin Cortex debug connector (ARM 2×5) is commonly used for tool compatibility.