STMicroelectronics STR755FR1T6

Overview

STR755FR1T6 from STMicroelectronics is a 32-bit ARM7TDMI-S™ microcontroller with 128 KB Flash (Bank 0), 16 KB RWW Flash (Bank 1), 16 KB SRAM, integrated CAN 2.0B and USB Full-Speed interfaces, and 72 GPIOs - designed for industrial motor control, embedded USB peripherals, and real-time automation systems operating at up to 60 MHz.

For engineers reviewing the STR755FR1T6 datasheet, STR755FR1T6 pinout, STR755FR1T6 application, or STR755FR1T6 equivalent, key selection criteria include dual-voltage operation (3.3V/5V), CAN+USB coexistence in LQFP100 package, 10-bit ADC with 16-channel scan mode, 6-channel PWM with dead-time generation, and nested interrupt controller supporting 32 vectors and 16 priority levels.

Technical Context

The STR755FR1T6 implements an ARM7TDMI-S core with 54 DMIPS @ 60 MHz, paired with a dedicated 48 MHz USB clock derived from the internal PLL - enabling concurrent AHB (60 MHz), APB (32 MHz), and USB (12 Mbps) operation without external oscillators. Its memory architecture separates program execution (Bank 0 Flash) from parameter storage (Bank 1 RWW Flash), supporting over-the-air updates while maintaining runtime data integrity.

It integrates a synchronized timer subsystem: three 16-bit standard timers (TIM0–TIM2) with input capture/output compare, plus a dedicated 16-bit 6-channel PWM timer featuring edge/center-aligned waveforms, programmable dead time, and emergency stop - all linked via Timer Link for coordinated motor phase control. The CAN interface supports both standard (11-bit) and extended (29-bit) frames at up to 1 Mbps.

Key Specifications

Pinout & Package

LQFP100 (14 × 14 mm, 0.5 mm pitch) package with exposed thermal pad; 100-pin layout optimized for mixed-signal routing, CAN/USB isolation, and motor control I/O remapping.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32F103C8T6 and LPC2368, STR755FR1T6 uniquely combines CAN+USB coexistence in LQFP100, RWW Flash for safe parameter updates, and hardware-synchronized PWM for motor control - making it optimal for industrial motion systems requiring field-upgradable firmware and deterministic timing.

Availability

STR755FR1T6 is available at Aetrix Electronics and suitable for industrial motor drives, USB-capable embedded peripherals, and programmable circuit breakers requiring stable component supply across extended temperature ranges (-40°C to +105°C).

Supply support for STR755FR1T6 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, specializing in microcontrollers, power management, and automotive ICs with vertical manufacturing capabilities.

The STR750 family was engineered for industrial real-time control applications demanding dual-voltage operation, CAN/USB integration, and robust motor timing - targeting appliances, UPS systems, PLCs, and medical equipment.

FAQ

Does STR755FR1T6 support simultaneous CAN and USB operation?

Yes - STR755FR1T6 supports concurrent CAN 2.0B and USB Full-Speed operation only in the LQFP100 and LFBGA100 packages. In LQFP64 variants, CAN and USB share pins and cannot be used simultaneously. The LQFP100 pinout allocates dedicated CAN_RX/CAN_TX and USB_DP/USB_DM pins, verified in ST's RM0017 reference manual Section 4.1.

What is the maximum ADC sampling rate achievable with DMA?

With DMA enabled and configured for continuous scan mode across all 16 channels, the STR755FR1T6 achieves a sustained sampling rate of 266 kSPS (3.75 µs per conversion × 16 channels = 60 µs total cycle). This is confirmed in Section 6.3.12 of the datasheet, where minimum conversion time is specified as 3.75 µs under VDD = 3.3V and f_ADC = 12 MHz.

How does the RWW Flash bank enable safe firmware updates?

The 16 KB RWW Flash Bank 1 allows code execution from Bank 0 while erasing/programming Bank 1 - enabling live parameter storage (e.g., motor calibration constants) without system reset. This is implemented via independent Flash control registers (FLASH_CR2, FLASH_ACR2), documented in Section 6.3.6 of the datasheet with 100k write/erase endurance.

Can the 6-channel PWM timer drive three-phase inverter bridges directly?

Yes - the PWM timer provides six complementary outputs with programmable dead time (1–128 clock cycles), edge- or center-aligned waveforms, and emergency stop input (EVI) that forces all outputs low within one clock cycle. These features are explicitly designed for driving IGBT/MOSFET half-bridges in BLDC and PMSM motor inverters, as detailed in Section 3.10 of the reference manual.