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STMicroelectronics STR751FR2T6
- Part No.:
- STR751FR2T6
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 64-LQFP
- Datasheet:
-
STR751FR2T6.pdf
- Description:
- IC MCU 32BIT 256KB FLASH 64LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:1,387
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Product details
Overview
STR751FR2T6 from STMicroelectronics is an ARM7TDMI-S™ 32-bit microcontroller with 256 KB Flash (Bank 0), 16 KB RWW Flash (Bank 1), 16 KB SRAM, integrated CAN 2.0B, USB Full-Speed (12 Mb/s), three UARTs, two SSPs, I²C, six timers including motor-control PWM, and a 10-bit ADC with 11 input channels - deployed in industrial motor drives and embedded control systems requiring dual-voltage (3.3V/5V) operation and extended temperature support.
For engineers reviewing the STR751FR2T6 datasheet, STR751FR2T6 pinout, STR751FR2T6 application, or STR751FR2T6 equivalent, this MCU delivers verified real-time interrupt handling (32 vectors, 16 IRQ priorities), deterministic low-power modes (STOP/STANDBY with RTC wake-up), SMI boot capability from external serial Flash, and hardware-accelerated peripheral DMA for UART/SSP/ADC/PWM - critical for deterministic motion control and fieldbus-connected devices.
Technical Context
The STR751FR2T6 implements an ARM7TDMI-S core running at up to 60 MHz (54 DMIPS), with clock management including internal 5 MHz RC oscillator for fast start-up, PLL-based AHB/APB scaling, and dedicated 48 MHz USB clock generation. It supports dual supply schemes (3.3V ±10% or 5V ±10%), with on-chip 1.8V voltage regulators for VCORE and VBACKUP.
Its nested interrupt controller handles 32 vectors with 16 priority levels and two maskable FIQ sources; the 4-channel DMA supports circular buffers and is tightly coupled to UART0, SSP0, PWM timer, TIM0, and ADC - enabling zero-CPU-overhead data streaming in motor control and communication stacks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core | ARM7TDMI-S 32-bit RISC CPU @ 60 MHz, 54 DMIPS - enables real-time deterministic execution of C-based firmware without external co-processors. |
| Flash Memory | 256 KB Bank 0 + 16 KB RWW Flash Bank 1 (100k write/erase cycles, 20-yr data retention @ 85°C) - supports over-the-air parameter updates while executing code from main bank. |
| SRAM | 16 KB on-chip high-speed SRAM with zero-wait-state access - sufficient for RTOS kernel, stack, and real-time control buffers. |
| ADC | 10-bit SAR ADC with 11 external channels, 3.75 µs min conversion time, programmable watchdog - meets timing-critical sampling for brushless DC motor commutation sensing. |
| CAN Interface | CAN 2.0B Active compliant, 1 Mbit/s max bit rate, 32-message object RAM buffer - enables robust fieldbus communication in industrial automation nodes. |
| PWM Timer | 16-bit 6-channel synchronizable motor-control PWM with dead-time insertion, edge/center-aligned waveforms, emergency stop - directly drives 3-phase inverter gate drivers. |
| Low-Power Modes | SLOW, WFI, STOP, STANDBY with RTC wake-up; STOP retains SRAM/register state using V18_BKP - extends battery life in portable medical or alarm systems. |
Pinout & Package
LQFP64 (10 × 10 mm, 0.5 mm pitch) package with 38 GPIOs, including high-sink capability (20 mA per pin), atomic bit SET/RES operations, and remappable timer alternate functions per Table 3 of datasheet Rev 5.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VDD_IO | Digital power supply | Accepts single 3.3V ±10% or 5V ±10%; VDD_IO must remain powered in all low-power modes including STANDBY. |
| V18, V18REG, V18_BKP | Core & backup voltage rails | Internally generated 1.8V for VCORE and VBACKUP; external 1.8V bypass possible via Power Scheme 2/4. |
| OSC_IN/OSC_OUT | Crystal oscillator interface | Supports 4 MHz or 8 MHz crystal/ceramic resonator; failure detection switches to internal 5 MHz RC oscillator. |
| USB_DP/USB_DM | USB Full-Speed differential pair | Requires VDD = 3.3V ±10%; dedicated 48 MHz clock derived internally - no external crystal needed for USB. |
| CAN_H/CAN_L | CAN bus transceiver interface | Direct connection to ISO 11898-compliant physical layer; supports dominant/recessive signaling and error frame handling in firmware. |
| PA0–PA15, PB0–PB15, PC0–PC7 | General-purpose I/O ports | 38 total GPIOs; 16-bit atomic SET/RES registers enable race-free bit manipulation in ISRs and RTOS tasks. |
Key Features
| Feature | Design Value |
|---|---|
| SMI Boot Capability | Direct boot from external serial Flash (up to 64 MB across 4 banks) - eliminates need for external boot ROM in cost-sensitive industrial controllers. |
| Motor-Control PWM Timer | 6-channel synchronized output with configurable dead time, emergency stop input, and center-aligned mode - enables precise FOC (Field-Oriented Control) implementation. |
| Real-Time Clock (RTC) | Independent 32.768 kHz or internal RC clock source with calendar, alarm, and auto-wake from STOP/STANDBY - sustains timekeeping during mains loss in UPS or energy meters. |
| DMA with Circular Buffer Support | 4-channel controller servicing UART0, SSP0, PWM, TIM0, and ADC - eliminates CPU polling overhead in continuous sensor acquisition or protocol bridging. |
| Flexible Power Schemes | Four validated configurations (3.3V-only, 5V-only, 3.3V+1.8V, 5V+1.8V) - allows optimization for I/O voltage level, power efficiency, or existing board rail architecture. |
Applications
| Brushless DC Motor Drive | Industrial CAN Node |
|---|---|
|
Use Scenario: Closed-loop speed/torque control of 3-phase BLDC motors in HVAC blowers or power tools. IC Role / Device Role / Timing Role: Real-time PWM waveform generation, ADC-based current/voltage sampling, and CAN-based command reception. Use Value: Integrated 6-channel PWM with dead-time control and 11-channel ADC enables single-chip motor control without external gate drivers or signal conditioners. |
Use Scenario: Field device node in factory automation network communicating via CANopen or J1939. IC Role / Device Role / Timing Role: CAN message handling, sensor data aggregation, and local logic execution with deterministic interrupt latency. Use Value: On-chip CAN 2.0B controller with 32-message RAM buffer and hardware acceptance filtering reduces host CPU load and ensures reliable message scheduling. |
| USB Human Interface Device | Programmable Logic Controller (PLC) I/O Module |
|
Use Scenario: USB-connected diagnostic tool or configuration interface for embedded equipment. IC Role / Device Role / Timing Role: USB Full-Speed device endpoint management, HID report parsing, and local status LED/button control. Use Value: Integrated USB PHY and software-configurable endpoints eliminate external transceiver, reducing BOM count and PCB area in compact field tools. |
Use Scenario: DIN-rail mounted digital I/O expansion module with analog inputs and CAN backbone connectivity. IC Role / Device Role / Timing Role: High-reliability GPIO management, 10-bit ADC scanning, and CAN message forwarding between local sensors and master PLC. Use Value: 38 GPIOs with atomic bit operations, 16 KB SRAM for cyclic I/O buffering, and -40°C to +85°C operation ensure robustness in harsh industrial environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ARM7-based microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STR750FV2T6 | Same ARM7TDMI-S core and peripheral set, but LFBGA64 package (8×8 mm) and 128 KB Flash (Bank 0) - no RWW Flash Bank 1. | Lacks 16 KB RWW Flash for runtime parameter storage; smaller footprint but no remappable timer I/O in 64-pin form factor. | Select when board space is constrained and RWW functionality is unnecessary; verify thermal performance in LFBGA. |
| STM32F103C8T6 | Cortex-M3 core (72 MHz), 64 KB Flash, 20 KB RAM, no CAN 2.0B or SMI; USB 2.0 FS but no dedicated CAN PHY interface. | Higher CPU performance but lacks native CAN 2.0B message RAM buffer and external serial Flash boot - requires external memory or bootloader complexity. | Choose for new designs prioritizing Cortex-M ecosystem and toolchain continuity; not drop-in compatible for legacy STR75x CAN/SMI use cases. |
Compared with STR750FV2T6, STR751FR2T6 provides essential RWW Flash and timer I/O remapping for field-upgradable motor firmware; versus STM32F103C8T6, it offers proven CAN 2.0B integration and SMI boot - critical for industrial retrofit and long-lifecycle deployments.
Availability
STR751FR2T6 is available at Aetrix Electronics and suitable for industrial motor drives, CAN-based field instrumentation, and USB-configurable embedded controllers requiring stable component supply across extended temperature ranges (-40°C to +85°C).
Supply support for STR751FR2T6 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, delivering silicon solutions for automotive, industrial, and embedded markets since 1987.
The STR750 family was designed specifically for deterministic real-time control in resource-constrained industrial environments - integrating CAN, USB, motor-control PWM, and dual-voltage operation into a single ARM7-based MCU platform.
FAQ
Does STR751FR2T6 support both 3.3V and 5V operation simultaneously?
No - the device operates on a single supply: either 3.3V ±10% or 5V ±10%. When powered by 5V, USB functionality is disabled due to VDD voltage violation; 3.3V operation is mandatory for USB use. Power Scheme selection determines whether internal regulators generate VCORE/VBACKUP or accept external 1.8V rails.
What is the maximum ADC sampling rate achievable with STR751FR2T6?
The minimum conversion time is 3.75 µs per sample, enabling up to 266.7 kSPS in single-shot mode. In scan mode with 11 channels, sustained throughput depends on trigger source (e.g., TIM0 overflow); practical rates reach ~100 kSPS with DMA offload to avoid CPU bottleneck.
Can the STR751FR2T6 boot directly from external SPI Flash without external logic?
Yes - the Serial Memory Interface (SMI) supports direct boot from up to four external serial Flash devices (total 64 MB) using dedicated boot pins. No external address latches or glue logic are required; boot mode is selected at reset via BOOT0/BOOT1 pin states.
Is the CAN interface electrically isolated on-chip?
No - STR751FR2T6 provides only the CAN protocol controller (CAN 2.0B). An external isolated CAN transceiver (e.g., ISO1050 or ADM3053) must be used for galvanic isolation in industrial networks. The CAN_H/CAN_L pins connect directly to the transceiver's differential bus interface.
STR751FR2T6 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 64-LQFP
- Series:
- STR7
- Packaging:
- Tray
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Core Processor:
- ARM7®
- Core Size:
- 32-Bit Single-Core
- Speed:
- 60MHz
- Connectivity:
- I2C, SPI, SSI, SSP, UART/USART, USB
- Peripherals:
- DMA, PWM, WDT
- Number of I/O:
- 38
- Program Memory Size:
- 256KB (256K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 16K x 8
- Voltage - Supply (Vcc/Vdd):
- 3V ~ 5.5V
- Data Converters:
- A/D 11x10b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
STR751FR2T6 FAQ
1.How can I place an order for STR751FR2T6 through Aetrix?
Please submit a Request for Quotation (RFQ) for STR751FR2T6 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for STR751FR2T6 reliable?
The price and inventory of STR751FR2T6 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STR751FR2T6 is usually 5 days.
3.What payment methods are accepted for STR751FR2T6?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STR751FR2T6 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STR751FR2T6?
STR751FR2T6 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STR751FR2T6 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for STR751FR2T6?
For technical support, including STR751FR2T6 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STR751FR2T6 requirements.
6.How does Aetrix verify that STR751FR2T6 is sourced from the original manufacturer or authorized distributors?
All STR751FR2T6 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that STR751FR2T6 meets industry standards.
7.What is the process for return or replacement of STR751FR2T6?
All STR751FR2T6 units undergo pre-shipment inspection (PSI). If there is an issue with STR751FR2T6, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The STR751FR2T6 part is unused and in its original packaging.
Return procedure for STR751FR2T6:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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