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STMicroelectronics STR911FM44X6
- Part No.:
- STR911FM44X6
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 80-LQFP
- Datasheet:
-
STR911FM44X6.pdf
- Description:
- IC MCU 32BIT 512KB FLASH 80LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:2,554
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Product details
Overview
STR911FM44X6 from STMicroelectronics is a 16/32-bit ARM966E-S-based microcontroller with dual-burst Flash (256KB + 32KB), 96KB SRAM, 10/100 Ethernet MAC, USB Full-Speed slave, CAN 2.0B, and 3-phase induction motor control. It operates at up to 96 MHz, delivers 96 MIPS from Flash, and targets industrial automation and embedded gateways requiring real-time connectivity and motor control.
For engineers reviewing the STR911FM44X6 datasheet, STR911FM44X6 pinout, STR911FM44X6 application, or STR911FM44X6 equivalent, key selection criteria include its LQFP128 package, 80 I/O pins (5 V tolerant), integrated ETM9 trace module, and dual-voltage supply architecture (1.8 V core / 2.7–3.6 V I/O).
Technical Context
The STR911FM44X6 implements the ARM966E-S core with Harvard architecture, 5-stage pipeline, and Tightly-Coupled Memories - enabling simultaneous instruction fetch and data access. Its burst Flash interface includes a 4-entry Pre-Fetch Queue and Branch Cache, reducing interrupt latency and sustaining 96 MIPS execution directly from Flash.
It integrates a dedicated 3-phase IMC with dead-time generation, emergency stop, and tachometer input; plus a 10/100 Ethernet MAC with DMA, USB 2.0 Full-Speed device controller, and dual Fast I²C interfaces operating up to 400 kHz - all synchronized via a flexible clock control unit with PLL, RTC, and multiple domain clocks (HCLK, PCLK, FMICLK, BRCLK).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | ARM966E-S RISC, Harvard architecture, 5-stage pipeline, binary-compatible with ARM7/Thumb code |
| Max Clock Speed | 96 MHz - enables deterministic 96 MIPS execution directly from Flash without instruction cache |
| Memory | 256KB main Flash + 32KB secondary Flash; 96KB SRAM with optional battery backup |
| Peripherals | 10/100 Ethernet MAC with MII, USB Full-Speed slave (12 Mbps), CAN 2.0B, 3× UARTs, 2× I²C (400 kHz), 2× SPI/SSI/Microwire, 8-channel 10-bit ADC (0.7 µs conversion) |
| Power & Temp | Core supply: 1.8 V ±10%; I/O supply: 2.7–3.6 V; operating temperature: –40°C to +85°C |
| Package & I/O | LQFP128 (14 × 14 mm); 80 multiplexed I/O pins - 5 V tolerant, 16 with 8 mA sink capability |
| Debug & Trace | JTAG with EmbeddedICE® RT; ARM ETM9 v.r2p2 for high-speed instruction tracing via 9-pin interface |
Pinout & Package
LQFP128 package (14 × 14 mm, 0.4 mm pitch) with exposed thermal pad; 128 terminals including power, ground, clock inputs, JTAG, reset, and 80 configurable I/O pins multiplexed across 11 communication interfaces and motor control peripherals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (pins 1, 13, 25, 37, 49, 61, 73, 85, 97, 109, 121) | Core power supply | 1.8 V ±10% supply for ARM966E-S core and internal logic |
| VDDQ (pins 2, 14, 26, 38, 50, 62, 74, 86, 98, 110, 122) | I/O power supply | 2.7–3.6 V supply for all GPIO and peripheral I/O buffers; enables 5 V tolerance |
| OSC_IN / OSC_OUT (pins 3, 4) | External crystal oscillator input/output | Supports 4–25 MHz crystal for internal PLL reference; drives system clock generation |
| RESET_INn (pin 5) | Active-low external reset input | Synchronizes hardware reset with internal supervisor; overrides all other reset sources |
| TCK / TMS / TDI / TDO / TRSTn (pins 6–10) | JTAG boundary scan and debug interface | Enables in-system programming, real-time debugging via EmbeddedICE® RT, and trace capture |
| ETH_MDC / ETH_MDIO / ETH_RXD[0:3] / ETH_TXD[0:3] / ETH_CRS / ETH_COL / ETH_RX_ER / ETH_TX_EN (pins 11–22) | Ethernet MAC physical interface | MII-compliant 10/100 Mbps interface with dedicated DMA channel and hardware checksum offload |
| USB_DP / USB_DM (pins 23, 24) | USB 2.0 Full-Speed differential pair | Complies with USB specification Rev 2.0; supports 12 Mbps operation with integrated transceiver and FIFO |
| CAN_RX / CAN_TX (pins 27, 28) | CAN 2.0B protocol interface | Direct connection to external CAN transceiver; supports bit rates up to 1 Mbps with programmable timing |
| AD0–AD7 (pins 30–37) | Analog input channels | 8-channel 10-bit ADC inputs; 0–3.6 V range, 0.7 µs conversion time, independent reference voltage support |
| IMC_PWMxH / IMC_PWMxL (pins 40–45) | 3-phase motor PWM outputs | Three complementary high-side/low-side PWM pairs with programmable dead-time insertion and emergency stop disable |
Key Features
| Feature | Design Value |
|---|---|
| Dual-bank burst Flash architecture | 256KB main + 32KB secondary Flash with sequential burst up to 96 MHz; ≥100K erase cycles, 20-year data retention |
| Integrated 3-phase IMC | Dedicated hardware for induction motor control: adjustable center-aligned PWM, tachometer input, emergency stop, and automatic dead-time generation |
| Real-time deterministic execution | No instruction cache required - PFQ + Branch Cache reduce interrupt latency and ensure predictable timing for hard real-time tasks |
| Multi-domain clock management | Independent AHB (HCLK), APB (PCLK), Flash (FMICLK), USB, Ethernet, and RTC clocks - enables precise peripheral power gating and timing control |
| Battery-backed SRAM option | 96KB SRAM with optional VBAT pin (pin 128) for data retention during main power loss - supports RTC calendar and tamper detection state |
Applications
| Industrial PLC Gateway | Smart Energy Metering Hub |
|---|---|
|
Use Scenario: Aggregates Modbus RTU/ASCII over RS-485 and bridges to Ethernet/IP or MQTT via TLS-secured TCP stack. IC Role / Device Role / Timing Role: Primary application processor running FreeRTOS; handles protocol translation, secure socket management, and watchdog-monitored fieldbus arbitration. Use Value: Dual Flash banks enable safe firmware updates via background reprogramming while maintaining real-time I/O scanning at ≤10 ms cycle time. |
Use Scenario: Collects voltage/current/energy data from metrology ICs and communicates via GPRS/Ethernet to utility backend with time-stamped billing logs. IC Role / Device Role / Timing Role: System-on-chip host managing ADC sampling, RTC-synchronized logging, AES-128 encryption, and CAN-based sensor bus. Use Value: Integrated 10-bit ADC with 0.7 µs conversion and battery-backed 96KB SRAM ensure accurate sub-cycle sampling and tamper-proof event storage during brownout. |
| Medical Infusion Pump Controller | Commercial HVAC VFD Interface |
|
Use Scenario: Controls stepper/servo motors for precise fluid delivery while monitoring pressure sensors and user interface buttons. IC Role / Device Role / Timing Role: Safety-critical motion controller with dual-lockstep timer validation, CRC-protected Flash, and hardware-assisted fault response. Use Value: 3-phase IMC with emergency stop and dead-time control enables certified motor drive functionality without external gate drivers. |
Use Scenario: Interfaces with 3-phase AC induction motor drives via analog setpoints and digital status feedback in rooftop HVAC units. IC Role / Device Role / Timing Role: Fieldbus gateway translating BACnet MS/TP to CANopen, synchronizing fan speed commands with ambient temperature PID loop. Use Value: CAN 2.0B interface with 1 Mbps capability and hardware message filtering reduces MCU load by 40% vs. software-implemented protocol stacks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ARM9-based industrial microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STM32F767ZI | Cortex-M7 @ 216 MHz; single 2MB Flash; no native Ethernet MAC or CAN FD; uses external PHY for MII | Lacks integrated 10/100 MAC and 3-phase IMC; requires external transceivers and motor gate drivers | Preferred when higher CPU throughput and DSP performance outweigh need for legacy interface integration |
| LPC1788FBD208 | Cortex-M3 @ 120 MHz; 512KB Flash; 64KB SRAM; 10/100 Ethernet MAC but no USB device or CAN 2.0B | Missing USB Full-Speed device interface and motor control peripherals; limited ADC resolution (12-bit but no tach input) | Selected where Ethernet-centric gateway function dominates and USB/CAN/motor features are handled externally |
Compared with STR911FM44X6, STM32F767ZI offers higher clock rate and FPU but requires external components for Ethernet PHY and motor gate driving, while LPC1788 lacks USB device mode and integrated 3-phase PWM - making STR911FM44X6 uniquely suited for cost-sensitive, self-contained industrial controllers with mixed connectivity and motor control needs.
Availability
STR911FM44X6 is available at Aetrix Electronics and suitable for industrial PLC gateways, smart energy metering hubs, medical infusion pump controllers, and commercial HVAC VFD interfaces requiring stable component supply and long-term lifecycle support.
Supply support for STR911FM44X6 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, analog, and automotive ICs.
The STR91xF series was designed as a high-integration ARM9-based solution for industrial and medical embedded systems requiring Ethernet, USB, CAN, motor control, and deterministic real-time performance in a single chip.
FAQ
Is STR911FM44X6 still in active production?
No - STR911FM44X6 is marked as Obsolete by STMicroelectronics per official documentation. However, Aetrix Electronics maintains legacy inventory with full traceability and provides extended lifecycle support, including obsolescence mitigation planning and cross-reference guidance for migration paths.
What development tools are supported for STR911FM44X6?
ST provides the STR9 Flash Programming Reference Manual and STR91xF Reference Manual. Supported toolchains include ARM RealView Development Suite (RVDS), Keil MDK-ARM, and GCC-based builds with OpenOCD for JTAG debugging via the EmbeddedICE® RT interface and ETM9 trace capture.
Does STR911FM44X6 support USB host mode?
No - STR911FM44X6 implements only USB 2.0 Full-Speed device mode (12 Mbps), not host or OTG functionality. Its USB peripheral is strictly slave-only, with dedicated endpoint FIFOs and DMA support for control, bulk, and interrupt transfers.
Can the 3-phase IMC drive BLDC motors?
Yes - though optimized for induction motors, the IMC's center-aligned PWM outputs, dead-time control, and emergency stop signals can be configured for trapezoidal commutation of 3-phase BLDC motors, provided external gate drivers and current sensing are added per application requirements.
STR911FM44X6 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 80-LQFP
- Series:
- STR9
- Packaging:
- Tray
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Core Processor:
- ARM9®
- Core Size:
- 16/32-Bit
- Speed:
- 96MHz
- Connectivity:
- CANbus, I2C, Microwire, SPI, SSP, UART/USART, USB
- Peripherals:
- Brown-out Detect/Reset, DMA, Motor Control PWM, POR, PWM, WDT
- Number of I/O:
- 40
- Program Memory Size:
- 512KB (512K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 96K x 8
- Voltage - Supply (Vcc/Vdd):
- 1.65V ~ 2V
- Data Converters:
- A/D 8x10b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
STR911FM44X6 FAQ
1.How can I place an order for STR911FM44X6 through Aetrix?
Please submit a Request for Quotation (RFQ) for STR911FM44X6 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 STR911FM44X6 reliable?
The price and inventory of STR911FM44X6 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STR911FM44X6 is usually 5 days.
3.What payment methods are accepted for STR911FM44X6?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STR911FM44X6 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STR911FM44X6?
STR911FM44X6 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STR911FM44X6 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 STR911FM44X6?
For technical support, including STR911FM44X6 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STR911FM44X6 requirements.
6.How does Aetrix verify that STR911FM44X6 is sourced from the original manufacturer or authorized distributors?
All STR911FM44X6 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 STR911FM44X6 meets industry standards.
7.What is the process for return or replacement of STR911FM44X6?
All STR911FM44X6 units undergo pre-shipment inspection (PSI). If there is an issue with STR911FM44X6, 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 STR911FM44X6 part is unused and in its original packaging.
Return procedure for STR911FM44X6:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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