STMicroelectronics STR752FR1T7

Overview

STR752FR1T7 from STMicroelectronics is a 32-bit ARM7TDMI-S™ microcontroller with 256 KB Flash (Bank 0), 16 KB RWW Flash (Bank 1), 16 KB SRAM, integrated CAN 2.0B interface, USB Full-Speed (12 Mb/s), and motor-control-optimized 6-channel PWM timer. It operates at up to 60 MHz, supports dual supply (3.3V ±10% or 5V ±10%), and targets industrial motor drives requiring synchronized timing, real-time I/O, and embedded firmware execution.

For engineers reviewing the STR752FR1T7 datasheet, STR752FR1T7 pinout, STR752FR1T7 application, or STR752FR1T7 equivalent, this MCU delivers verified CAN/USB coexistence, 10-bit ADC with 11 input channels (LQFP64 package), nested interrupt controller with 32 vectors, and SMI boot capability from external serial Flash - critical for field-upgradable embedded control systems.

Technical Context

The STR752FR1T7 implements an ARM7TDMI-S core with Harvard bus architecture, supporting Thumb instruction set and achieving 54 DMIPS at 60 MHz. Its memory subsystem includes two independent Flash banks: Bank 0 (256 KB) for code storage with 10k write/erase cycles, and Bank 1 (16 KB RWW) for runtime parameter storage with 100k cycles and 20-year data retention at 85°C.

Peripheral timing is managed via a programmable PLL generating AHB (up to 60 MHz), APB (up to 32 MHz), and dedicated 48 MHz USB clock from a 4–8 MHz crystal. The motor-control PWM timer provides edge/center-aligned waveforms, dead-time insertion, and emergency stop - directly synchronized with three 16-bit standard timers via Timer Link for induction or BLDC motor commutation.

Key Specifications

Pinout & Package

LQFP64 package (10 × 10 mm, 0.5 mm pitch) with exposed thermal pad; 38 general-purpose I/O pins, including dedicated CAN_TX/CAN_RX, USB_DP/USB_DM, and six PWM output terminals mapped to PORTA and PORTB.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32F103C8T6 and STR750FV0, STR752FR1T7 uniquely combines 5V-tolerant I/O, LQFP64 packaging, and guaranteed CAN+USB coexistence - making it the only option for retrofitting industrial controllers requiring both fieldbus communication and USB-based service access without redesigning power or footprint.

Availability

STR752FR1T7 is available at Aetrix Electronics and suitable for industrial motor drives, programmable logic controllers, uninterruptible power supplies, and medical infusion pumps requiring stable component supply across extended temperature ranges (-40 to +85°C).

Supply support for STR752FR1T7 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 and long-term product longevity commitments.

The STR750 family was designed specifically for industrial embedded control applications demanding mixed-signal integration, real-time responsiveness, and field-upgradability - with STR752FR1T7 optimized for cost-sensitive LQFP64 implementations requiring CAN and USB in one chip.

FAQ

Does STR752FR1T7 support simultaneous CAN and USB operation?

Yes. The STR752FR1T7 supports concurrent CAN 2.0B and USB Full-Speed operation in its LQFP64 package. Unlike some variants in the STR750 family, STR752FR1T7 allocates dedicated hardware resources to both interfaces, enabling real-time CAN fieldbus communication while allowing USB-based firmware updates or configuration - confirmed in Section 2 Device Overview and Table 2 of the official datasheet.

What is the maximum ADC sampling rate achievable with STR752FR1T7?

The minimum conversion time is 3.75 µs per sample, yielding a theoretical maximum sampling rate of 266.7 kSPS. In practice, with scan mode and DMA-triggered acquisition across 11 channels, sustained throughput reaches ~24 kSPS per channel due to setup overhead and FIFO management - validated in Section 6.3.12 (10-bit ADC characteristics) of the datasheet.

Can STR752FR1T7 operate from a 5V supply while using USB?

No. USB operation requires VDD = 3.3V ±10%, as stated in Section 3.1 Functional Description and Section 6.3.11 (USB characteristics). When powered from 5V, the USB peripheral is disabled; CAN, PWM, ADC, and other peripherals remain fully functional. This limitation is inherent to USB PHY electrical specifications and is not configurable.

Is the 16 KB RWW Flash bank accessible during program execution?

Yes. The 16 KB Read-While-Write Flash (Bank 1) supports concurrent read and write operations - enabling firmware to execute from Bank 0 while logging calibration data or updating parameters in Bank 1. This capability is explicitly documented in Section 1 Description and Section 3.1 Functional description under "Embedded Flash memory" with 100k write/erase cycles and 20-year data retention at 85°C.