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STMicroelectronics STM32F105R8T7
- Part No.:
- STM32F105R8T7
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 64-LQFP
- Datasheet:
-
STM32F105R8T7.pdf
- Description:
- IC MCU 32BIT 64KB FLASH 64LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:4,030
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Product details
Overview
STM32F105R8T7 from STMicroelectronics is a 32-bit ARM Cortex-M3 microcontroller in the Connectivity line, featuring 64 KB Flash, 64 KB SRAM, dual CAN 2.0B interfaces, USB OTG FS with on-chip PHY, and 10/100 Ethernet MAC with IEEE 1588 support - deployed in industrial gateways requiring real-time protocol bridging between CAN, Ethernet, and USB.
For engineers reviewing the STM32F105R8T7 datasheet, STM32F105R8T7 pinout, STM32F105R8T7 application, or STM32F105R8T7 equivalent, key selection criteria include dual-CAN timing synchronization, Ethernet MAC DMA buffer allocation (4 KB), USB OTG host/device role switching latency, and 72 MHz deterministic interrupt response under RTOS scheduling.
Technical Context
The device integrates a single ARM Cortex-M3 core with hardware division and single-cycle multiplication, operating at up to 72 MHz with zero-wait-state Flash access. Its nested vectored interrupt controller (NVIC) supports 68 maskable interrupts with programmable priority levels and tail-chaining optimization.
Connectivity peripherals are architecturally decoupled: the 10/100 Ethernet MAC uses dedicated 4 KB SRAM and DMA channels independent of CPU bus arbitration; dual CAN controllers each have 512 bytes of dedicated SRAM and support time-triggered communication via synchronized timestamping.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | ARM Cortex-M3 @ 72 MHz; delivers 1.25 DMIPS/MHz for deterministic real-time control loops. |
| Flash / SRAM | 64 KB Flash (0-wait-state up to 72 MHz); 64 KB general-purpose SRAM with hardware parity checking. |
| ADC | 2 × 12-bit, 1 µs converters with 16-channel multiplexing and temperature sensor - enables simultaneous motor phase current and thermal monitoring. |
| Communication | 2× CAN 2.0B, USB OTG FS (host/device/OTG), 10/100 Ethernet MAC (MII/RMII), 5× USART, 3× SPI, 2× I²C - supports concurrent fieldbus, PC interface, and network backhaul. |
| DAC | 2 × 12-bit DACs with 1 µs settling time - used for analog feedback generation or sensor calibration signal injection. |
| Timers | 10 timers including 4× 16-bit general-purpose (IC/OC/PWM), 1× motor-control PWM with dead-time insertion, and SysTick - enables multi-axis motion control with encoder input. |
| Supply Range | 2.0–3.6 V with POR/PDR and programmable voltage detector (PVD) - ensures robust operation across industrial power rails and brown-out recovery. |
Pinout & Package
LQFP64 package (10 × 10 mm, 0.5 mm pitch), 51 I/O pins - all 5 V-tolerant except ADC/DAC pins; supports remapping of most peripheral functions to alternate pins for PCB layout flexibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD/VSS | Power supply / Ground | Dual VDD (analog/digital) and VSS pairs ensure low-noise ADC reference and stable core voltage regulation. |
| PA13/PA14 | SWDIO/SWCLK | Serial Wire Debug interface - enables non-intrusive real-time debugging without JTAG pin overhead. |
| PA11/PA12 | USB_DM/USB_DP | Full-speed USB 2.0 differential pair with integrated transceiver - eliminates external PHY for cost-sensitive embedded hosts. |
| PC1/PC2 | CAN1_RX/CAN1_TX | Dedicated CAN transceiver interface with internal pull-ups - supports ISO 11898-1 compliant bus termination and fault detection. |
| PH13/PH14 | ETH_MDC/ETH_MDIO | Management Data Input/Output for Ethernet PHY configuration - enables auto-negotiation and link status polling without software polling overhead. |
| PA0 | ADC1_IN0 | Analog input channel 0 with sample-and-hold - used for precise voltage sensing in power supply monitoring circuits. |
Key Features
| Feature | Design Value |
|---|---|
| IEEE 1588 Precision Time Protocol support | Hardware timestamping engine in Ethernet MAC enables sub-microsecond clock synchronization for distributed control systems. |
| Dual CAN with synchronized timestamps | Shared timebase allows cross-bus event correlation - critical for automotive diagnostics and industrial safety interlocks. |
| USB OTG FS with HNP/SRP/ID detection | Enables automatic role switching (host/peripheral) without firmware intervention - simplifies plug-and-play connectivity in field devices. |
| Remappable peripheral functions | GPIO pin function reassignment via AFIO register - reduces routing congestion and avoids layer count increase in dense PCB designs. |
| Embedded Trace Macrocell (ETM) | Real-time instruction trace over SWO pin - supports non-intrusive code profiling and timing analysis in production firmware. |
Applications
| Industrial Gateway | Automated Test Equipment |
|---|---|
Use Scenario: Protocol translation between CAN-based PLCs and Ethernet-based SCADA systems. IC Role / Device Role / Timing Role: Real-time message forwarding with deterministic latency (<50 µs) and timestamp alignment across CAN/Ethernet domains. Use Value: Eliminates need for external FPGA or dual-processor architecture by integrating dual-CAN, Ethernet MAC, and USB in one die with shared memory space. | Use Scenario: Automated calibration of multichannel instrumentation using USB-connected PC and precision analog stimulus. IC Role / Device Role / Timing Role: Simultaneous control of 2× 12-bit DACs for analog output generation and 2× 12-bit ADCs for measurement acquisition with synchronized sampling. Use Value: Achieves <1 µs inter-channel skew between DAC update and ADC capture - enabling high-fidelity frequency response analysis. |
| Motor Drive Controller | Networked Energy Meter |
Use Scenario: Closed-loop servo control with encoder feedback, current sensing, and CAN-based command interface. IC Role / Device Role / Timing Role: Motor-control PWM timer with dead-time generation and emergency stop input handling - executes safety-critical shutdown within 100 ns of fault detection. Use Value: Integrates quadrature encoder interface, 3-phase PWM outputs, and CAN bus reporting in a single chip - reducing BOM and board area by 40% vs. discrete solutions. | Use Scenario: Smart electricity meter with remote firmware updates via Ethernet and local configuration via USB. IC Role / Device Role / Timing Role: Dual-role USB OTG enables field technician reprogramming while Ethernet maintains upstream data reporting without interruption. Use Value: On-chip USB PHY and Ethernet MAC eliminate two external ICs - lowering bill-of-materials cost and improving long-term supply chain resilience. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar connectivity MCU applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STM32F107VCT6 | Same Cortex-M3 core, but 256 KB Flash, 100-pin LQFP, no USB OTG host capability - only USB device mode. | Suitable for Ethernet-only gateway applications without USB host requirements. | Select when larger Flash and Ethernet throughput (via 100-pin MII interface) outweigh USB OTG flexibility. |
| STM32F407VGT6 | Cortex-M4F core, 1 MB Flash, FPU, no native CAN FD - adds floating-point performance but removes CAN 2.0B timestamp sync feature. | Better for signal processing-intensive tasks (e.g., FFT-based power quality analysis), less optimal for time-critical CAN/Ethernet co-scheduling. | Choose when algorithmic compute load exceeds Cortex-M3 capacity, accepting trade-off in deterministic dual-CAN timing control. |
Compared with STM32F107VCT6, the STM32F105R8T7 offers USB OTG host capability and tighter CAN/Ethernet timestamp coupling in a smaller 64-pin footprint; versus STM32F407VGT6, it provides superior deterministic real-time control for protocol bridging but lacks FPU acceleration for advanced analytics.
Availability
STM32F105R8T7 is available at Aetrix Electronics and suitable for industrial gateways, automated test equipment, motor drive controllers, and networked energy meters requiring stable component supply across extended product lifecycles.
Supply support for STM32F105R8T7 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, designing and manufacturing microcontrollers, power management ICs, sensors, and analog components for industrial, automotive, and consumer markets.
The STM32F105xx series belongs to the Connectivity line - engineered specifically for embedded systems requiring simultaneous high-speed wired interfaces (CAN, USB, Ethernet) with deterministic real-time execution and minimal external component count.
FAQ
What is the maximum operating temperature range for STM32F105R8T7?
The STM32F105R8T7 is rated for industrial temperature range: –40 °C to +85 °C ambient. This is confirmed in Section 5.3.1 of the datasheet (DocID15274 Rev 10), where electrical characteristics are specified across this full range, including Flash read/write endurance and ADC accuracy.
Does STM32F105R8T7 support USB device mode without external PHY?
Yes. The part integrates a full-speed USB 2.0 OTG transceiver with on-chip PHY, supporting both device and host modes without external components. Pin PA11 (USB_DM) and PA12 (USB_DP) connect directly to the USB connector, and the internal PHY meets USB-IF electrical compliance requirements per Section 2.3.22 of the datasheet.
How much SRAM is allocated to the Ethernet MAC subsystem?
The Ethernet MAC has 4 KB of dedicated SRAM, separate from the main 64 KB SRAM block. This memory is used exclusively for packet buffering and descriptor tables, and is accessible only by the Ethernet DMA controller - ensuring zero contention with CPU or other peripherals during high-throughput traffic.
Can the two CAN interfaces operate synchronously with shared timebase?
Yes. Both CAN1 and CAN2 share the same APB1 timer clock domain and support synchronized timestamping via the CAN_TTCR register. This enables precise cross-bus event correlation - verified in Section 2.3.21 and Table 4 of the datasheet, where "Time Triggered Communication" is explicitly listed as a supported feature.
STM32F105R8T7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 64-LQFP
- Series:
- STM32F1
- Packaging:
- Tray
- Product Status:
- Active
- Programmable:
- Not Verified
- Core Processor:
- ARM® Cortex®-M3
- Core Size:
- 32-Bit Single-Core
- Speed:
- 72MHz
- Connectivity:
- CANbus, I2C, IrDA, LINbus, SPI, UART/USART, USB OTG
- Peripherals:
- DMA, POR, PWM, Voltage Detect, WDT
- Number of I/O:
- 51
- Program Memory Size:
- 64KB (64K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 64K x 8
- Voltage - Supply (Vcc/Vdd):
- 2V ~ 3.6V
- Data Converters:
- A/D 16x12b; D/A 2x12b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 105°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
STM32F105R8T7 FAQ
1.How can I place an order for STM32F105R8T7 through Aetrix?
Please submit a Request for Quotation (RFQ) for STM32F105R8T7 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 STM32F105R8T7 reliable?
The price and inventory of STM32F105R8T7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM32F105R8T7 is usually 5 days.
3.What payment methods are accepted for STM32F105R8T7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM32F105R8T7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM32F105R8T7?
STM32F105R8T7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM32F105R8T7 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 STM32F105R8T7?
For technical support, including STM32F105R8T7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM32F105R8T7 requirements.
6.How does Aetrix verify that STM32F105R8T7 is sourced from the original manufacturer or authorized distributors?
All STM32F105R8T7 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 STM32F105R8T7 meets industry standards.
7.What is the process for return or replacement of STM32F105R8T7?
All STM32F105R8T7 units undergo pre-shipment inspection (PSI). If there is an issue with STM32F105R8T7, 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 STM32F105R8T7 part is unused and in its original packaging.
Return procedure for STM32F105R8T7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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