STMicroelectronics STM32F100R4T6B

Overview

STM32F100R4T6B from STMicroelectronics is a 32-bit ARM® Cortex®-M3 microcontroller in LQFP64 package, featuring 16 KB Flash, 4 KB SRAM, 24 MHz max CPU frequency, 1×12-bit ADC (16-channel), and 2×12-bit DACs. It integrates 8 communication interfaces including 3 USARTs, 2 I²C, 2 SPI, and CEC, targeting cost-sensitive industrial control and sensor interface applications.

For engineers reviewing the STM32F100R4T6B datasheet, STM32F100R4T6B pinout, STM32F100R4T6B application, or STM32F100R4T6B equivalent, key selection considerations include Flash/SRAM size, ADC/DAC resolution and channel count, peripheral mix (especially CEC and LIN-capable USARTs), and LQFP64 thermal and layout constraints.

Technical Context

The device implements a single-cycle multiply/hardware divide Cortex-M3 core with nested vectored interrupt controller (NVIC) and external interrupt/event controller (EXTI). Its clock system includes dual oscillators (8 MHz HSI, 32 kHz LSI), 4–24 MHz HSE support, and PLL for CPU clock generation up to 24 MHz.

Peripherals are tightly coupled via 7-channel DMA supporting timers, ADC, SPI, I²C, USART, and DAC. Low-power operation includes Sleep, Stop, and Standby modes with VBAT-backed RTC and backup registers, plus programmable voltage detector (PVD) for supply monitoring.

Key Specifications

Pinout & Package

LQFP64 (10 × 10 mm, 0.5 mm pitch) package with exposed pad for thermal dissipation; 64-pin quad flat configuration optimized for industrial board layouts and reflow compatibility.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32F100R4T6B, STM32F030F4P6 trades DAC/CEC for M0 efficiency and higher clock, while STM32F103C8T6 expands Flash/SRAM and ADC capacity but omits DACs and CEC - making STM32F100R4T6B uniquely balanced for analog-rich, protocol-diverse value-line applications.

Availability

STM32F100R4T6B is available at Aetrix Electronics and suitable for industrial sensor nodes, smart HVAC controllers, POS peripherals, and energy meter interface modules requiring stable component supply, long-term manufacturability, and ECOPACK® compliance.

Supply support for STM32F100R4T6B 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, specializing in microcontrollers, power management, sensors, and automotive ICs with strong industrial and consumer market presence.

The STM32F100 value line targets cost-sensitive, high-volume embedded applications requiring rich analog integration (ADC/DAC), multiple serial interfaces, and low-power operation - balancing performance, feature set, and bill-of-materials efficiency.

FAQ

What is the maximum operating frequency and associated power consumption of the STM32F100R4T6B?

The STM32F100R4T6B operates at up to 24 MHz CPU frequency. At 24 MHz and 3.6 V supply, typical current consumption in Run mode with all peripherals enabled is 12.4 mA (from datasheet Table 12), scaling linearly with voltage and activity. Stop mode draws as low as 3.5 µA with RTC active and VBAT supplied.

Does the STM32F100R4T6B support hardware debugging, and which interfaces are available?

Yes, it supports Serial Wire Debug (SWD) via dedicated SWDIO and SWCLK pins, providing full debug, programming, and real-time trace capability. JTAG is also supported but shares pins with SWD; SWD is preferred for its 2-pin footprint and identical functionality in development and production programming.

How many I/O pins are 5 V-tolerant, and what are the implications for system design?

Of the 51 GPIOs, nearly all are 5 V-tolerant (except analog inputs and BOOT0). This allows direct interfacing with legacy 5 V logic, sensors, or displays without level shifters - reducing BOM cost and PCB area, especially in industrial retrofit or mixed-voltage sensor aggregation designs.

What unique peripheral combinations distinguish the STM32F100R4T6B from other value-line MCUs?

It uniquely combines 2×12-bit DACs, CEC interface, LIN-capable USARTs, and VBAT-backed RTC with backup registers - a feature set not replicated in other STM32F100 variants or competing value-line families. This makes it ideal for applications needing analog output, consumer electronics control, and persistent timekeeping in compact form factors.