STMicroelectronics STM32F100R4T6BTR

Overview

STM32F100R4T6BTR 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), 2×12-bit DACs, and 8 communication interfaces including USART, SPI, I²C, and CEC - deployed in industrial sensor nodes and low-cost motor control modules.

For engineers reviewing the STM32F100R4T6BTR datasheet, STM32F100R4T6BTR pinout, STM32F100R4T6BTR application, or STM32F100R4T6BTR equivalent, key selection criteria include Flash/SRAM size, 5 V-tolerant I/O count (up to 51 pins), RTC with VBAT backup, SWD debug support, and integrated temperature sensor for embedded thermal monitoring.

Technical Context

The device 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 integrates a 4–24 MHz external crystal oscillator, factory-trimmed 8 MHz RC, 40 kHz RC, PLL for CPU clock generation, and dedicated 32 kHz oscillator for RTC with calibration.

Peripherals include a 7-channel DMA controller servicing timers, ADC, SPI, I²C, USART, and DAC; nested vectored interrupt controller (NVIC) supporting up to 60 interrupts; and advanced timer subsystem comprising three 16-bit general-purpose timers, one 16-bit advanced-control timer with dead-time generation, and two basic timers for DAC triggering.

Key Specifications

Pinout & Package

LQFP64 (10 × 10 mm, 0.5 mm pitch) package with exposed thermal pad; RoHS-compliant, ECOPACK® certified.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32F100R4T6BTR, STM32F030F4P6 reduces BOM cost but sacrifices analog precision and timing features, while STM32F103C8T6 expands capability at higher power and layout overhead - making the R4T6BTR optimal for balanced analog-digital edge-node control.

Availability

STM32F100R4T6BTR is available at Aetrix Electronics and suitable for industrial sensor nodes, low-cost motor control modules, smart meter interface modules, and USB-to-serial bridge adapters requiring stable component supply across multi-year production cycles.

Supply support for STM32F100R4T6BTR 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, designing and manufacturing microcontrollers, power management ICs, MEMS, and automotive semiconductors since 1987.

This part belongs to the STM32F100 value line - engineered for cost-optimized, low-power embedded applications demanding rich analog integration, robust timing peripherals, and industrial-grade reliability in compact form factors.

FAQ

Does STM32F100R4T6BTR support USB device functionality?

No. The STM32F100R4T6BTR lacks a USB peripheral block. It supports USART with IrDA and LIN capabilities, SPI, I²C, and CEC for serial and consumer electronics control, but does not include USB transceivers or USB protocol stack hardware. USB connectivity requires external bridge ICs or migration to STM32F103-series parts.

What is the maximum operating temperature range for this device?

The STM32F100R4T6BTR is rated for industrial temperature range: –40 °C to +85 °C. This is confirmed in Section 5.3.1 of the datasheet (DocID16455 Rev 9), under "General operating conditions", and applies to all LQFP64-packaged variants in the STM32F100x4 subgroup.

Can the internal 8 MHz RC oscillator be used as the system clock source without external components?

Yes. The factory-trimmed 8 MHz internal RC oscillator is qualified as a system clock source with ±1% accuracy over temperature and voltage. It eliminates need for external crystal in cost-sensitive applications, though jitter and long-term stability are inferior to crystal-based clocks - suitable for non-critical timing functions like UART baud generation.

Is the VBAT pin mandatory for RTC operation?

VBAT is optional but required for RTC and backup registers to retain state during main power loss. When VBAT is connected (1.8–3.6 V), the RTC continues running and backup SRAM retains data. Without VBAT, RTC stops and backup registers reset on VDD power-down - confirmed in Section 2.2.14 of the datasheet.