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STMicroelectronics STR911FM42X6
- Part No.:
- STR911FM42X6
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 80-LQFP
- Datasheet:
-
STR911FM42X6.pdf
- Description:
- IC MCU 32BIT 256KB FLASH 80LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:4,231
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Product details
Overview
STR911FM42X6 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 supports real-time applications in industrial gateways and motor-driven equipment.
For engineers reviewing the STR911FM42X6 datasheet, STR911FM42X6 pinout, STR911FM42X6 application, or STR911FM42X6 equivalent, key selection criteria include ARM966E-S core binary compatibility with ARM7 code, deterministic interrupt latency via Branch Cache and VIC, 80 I/O pins with 5 V tolerance, and integrated EMI bus for external memory expansion.
Technical Context
The STR911FM42X6 implements a Harvard-architecture ARM966E-S core with 5-stage pipeline, instruction prefetch queue, and 4-entry branch cache-enabling 96 MIPS execution directly from Flash without instruction cache penalties. Its dual-bank Flash interface supports sequential burst operation at 96 MHz and ≥100K erase cycles.
It integrates tightly coupled peripherals including a 10/100 Ethernet MAC with DMA, USB 2.0 Full-Speed device controller with 10 endpoints, CAN 2.0B transceiver, and a dedicated 3-phase IMC with dead-time generation and emergency stop. Clock management includes internal PLL (up to 96 MHz), RTC with tamper detection, and three power modes (Run/Idle/Sleep) down to 50 µA.
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 Operating Frequency | 96 MHz - enables 96 MIPS execution directly from Flash memory |
| Flash Memory | 256 KB main + 32 KB secondary, 32-bit wide, 100K min erase cycles, 20 yr data retention |
| SRAM | 96 KB, 32-bit wide, optional battery backup for RTC-critical data retention |
| DMA Channels | 9 programmable channels - one dedicated to Ethernet, eight general-purpose with peripheral arbitration |
| Analog Peripherals | 8-channel 10-bit ADC (0–3.6 V range, 0.7 µs conversion), RTC with calendar, wake-up, and tamper detection |
| Communication Interfaces | 10/100 Ethernet MAC + MII, USB Full-Speed slave (12 Mbps), CAN 2.0B, 3× UART (16550-style + IrDA), 2× I²C (400 kHz), 2× SPI/SSI/Microwire, 8/16-bit EMI bus |
| I/O & Timers | Up to 80 multiplexed I/O pins (5 V tolerant, 16 with 8 mA sink), 4× 16-bit standard timers (input capture/output compare/PWM/pulse count), 3-phase IMC with adjustable center-aligned PWM |
Pinout & Package
LQFP128 package (14 × 14 mm, 0.4 mm pitch), thermally enhanced for industrial ambient operation up to +85°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Core) | Core supply input | 1.8 V ±10% - powers ARM966E-S core and internal logic; requires local decoupling |
| VDDQ (I/O) | I/O supply input | 2.7–3.6 V - powers all GPIO, peripheral I/O buffers, and EMI bus; enables 5 V tolerant operation |
| OSC_IN / OSC_OUT | External crystal oscillator terminals | Supports 4–25 MHz crystal for precise clock source; feeds internal PLL and RTC calibration |
| ETH_MDC / ETH_MDIO | Ethernet management interface | IEEE 802.3-compliant MDIO bus for PHY configuration and status monitoring |
| USB_DP / USB_DM | USB differential data pair | Full-Speed (12 Mbps) signaling per USB 2.0 specification; internal pull-up on DP for device enumeration |
| CAN_H / CAN_L | CAN bus differential pair | ISO 11898-2 compliant physical layer interface; supports 2.0B Active protocol with error handling |
| EMI_A[0:22] / EMI_D[0:15] | External memory interface address/data bus | 8/16-bit multiplexed or non-multiplexed mode; supports SRAM, NOR flash, and FPGA interfacing |
| JTAG_TCK / TMS / TDI / TDO / nTRST | JTAG boundary scan and debug interface | ARM EmbeddedICE® RT support for real-time debugging, flash ISP, and structural test |
Key Features
| Feature | Design Value |
|---|---|
| Branch Cache (BC) + Prefetch Queue (PFQ) | 4-entry BC + 4-instruction PFQ reduce interrupt latency and eliminate instruction fetch stalls during loops/branches |
| Dual-Bank Burst Flash Interface | Enables zero-wait-state 96 MHz execution from Flash - eliminates need for external SDRAM or instruction cache |
| Integrated 3-Phase IMC | Dedicated hardware PWM generator with dead-time insertion, emergency stop, tachometer input, and center-aligned output for motor control |
| Flexible Power Management | Run/Idle/Sleep modes with 50 µA Sleep current; brown-out monitor with early-warning interrupt and voltage supervisor |
| ARM ETM9 Trace Module | 9-pin high-speed instruction trace interface for non-intrusive real-time code profiling and debug |
| Vectored Interrupt Controller (VIC) | 32 IRQ vectors, 30 interrupt pins, FIQ support - ensures deterministic response to time-critical events like Ethernet packet arrival or ADC completion |
Applications
| Industrial Gateway | Motor-Controlled HVAC System |
|---|---|
Use Scenario: Protocol translation between Modbus RTU field devices and Ethernet/IP supervisory systems. IC Role / Device Role / Timing Role: Central MCU executing real-time protocol stacks, managing Ethernet MAC+USB+CAN concurrency, and scheduling deterministic timer-based polling. Use Value: Dual-bank Flash allows safe firmware updates over Ethernet while maintaining CAN/UART field communication; 96KB SRAM buffers multi-protocol message queues without external memory. |
Use Scenario: Closed-loop speed and torque control of 3-phase PMSM compressors in commercial HVAC units. IC Role / Device Role / Timing Role: Motor controller executing FOC algorithms, generating synchronized PWM, monitoring tach feedback, and responding to emergency stop signals within <1 µs. Use Value: Integrated IMC hardware offloads PWM timing and dead-time management from CPU, freeing ARM966E-S cycles for PID tuning and communication tasks. |
| Secure Access Terminal | Medical Infusion Pump Controller |
Use Scenario: Tamper-resistant door access panel with biometric reader, RFID, and network logging. IC Role / Device Role / Timing Role: Secure host processor managing encrypted data storage, RTC-based audit logging, tamper-detection GPIO monitoring, and USB/UART diagnostics. Use Value: RTC with tamper detection triggers immediate secure erase of keys upon enclosure breach; battery-backed SRAM preserves critical state during power loss. |
Use Scenario: Precision fluid delivery system requiring fail-safe flow rate control, pressure sensing, and alarm reporting. IC Role / Device Role / Timing Role: Safety-critical controller acquiring 10-bit ADC samples from pressure/flow sensors, driving stepper motor via PWM, and enforcing watchdog-checked timing deadlines. Use Value: Deterministic interrupt latency (<1 µs via VIC + BC) ensures timely response to occlusion alarms; independent A/D supply minimizes noise coupling into analog measurements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ARM9-based microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STR912FW42X6 | 512 KB + 32 KB Flash, same 96 KB SRAM, LQFP128 package | Higher code density requirement; no change in peripheral set or I/O count | Select when firmware exceeds 256 KB or future-proofing for feature expansion is required |
| STM32F407VGT6 | Cortex-M4F core (168 MHz), 1 MB Flash, 192 KB SRAM, no integrated Ethernet MAC or IMC | Requires external PHY and motor gate driver IC; higher DSP performance but less integrated motor/control IP | Select when floating-point math, audio processing, or USB OTG host capability outweighs need for built-in Ethernet/IMC |
Compared with STR911FM42X6, STR912FW42X6 offers double Flash capacity without altering peripheral functionality or power profile, while STM32F407VGT6 trades integrated Ethernet and IMC for higher CPU throughput and broader ecosystem support - making it suitable for applications where software-defined flexibility supersedes hardware-accelerated control.
Availability
STR911FM42X6 is available at Aetrix Electronics and suitable for industrial gateways, motor-control systems, secure access terminals, and medical infusion pumps requiring stable component supply across extended product lifecycles.
Supply support for STR911FM42X6 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 automotive-grade components since 1987.
The STR91xF series was developed as an industrial-optimized ARM9 solution targeting deterministic real-time control, integrated connectivity (Ethernet/USB/CAN), and motor drive acceleration - bridging legacy ARM7 systems and modern Cortex-M platforms.
FAQ
Is STR911FM42X6 still in active production?
No - STR911FM42X6 is marked as Obsolete by STMicroelectronics per official documentation. However, Aetrix Electronics maintains legacy inventory with full traceability and offers lifecycle support including obsolescence forecasting, cross-reference guidance, and last-time-buy coordination for ongoing production programs.
What is the maximum achievable Ethernet throughput using the on-chip MAC?
The STR911FM42X6's 10/100 Ethernet MAC supports full-duplex 100 Mbps operation with DMA-assisted packet handling. Real-world throughput reaches ~85 Mbps TCP/IP under optimized driver and buffer configuration - limited primarily by ARM966E-S bus arbitration and SRAM bandwidth, not MAC hardware.
Does the integrated CAN interface support FD (Flexible Data-Rate)?
No - the STR911FM42X6 implements CAN 2.0B Active only, supporting classic CAN frames up to 1 Mbps. It does not include CAN FD features such as bit-rate switching, extended data length (up to 64 bytes), or CRC enhancements defined in ISO 11898-1:2015.
Can the 3-phase IMC drive IGBTs directly?
No - the IMC outputs are logic-level PWM signals (3.3 V CMOS) requiring external gate driver ICs (e.g., STGW30V60DF, IRS21844) to interface with IGBTs or MOSFETs. The IMC provides dead-time generation, emergency stop assertion, and tachometer input - but no high-voltage/high-current drive capability.
STR911FM42X6 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:
- 256KB (256K 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:
STR911FM42X6 FAQ
1.How can I place an order for STR911FM42X6 through Aetrix?
Please submit a Request for Quotation (RFQ) for STR911FM42X6 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 STR911FM42X6 reliable?
The price and inventory of STR911FM42X6 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STR911FM42X6 is usually 5 days.
3.What payment methods are accepted for STR911FM42X6?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STR911FM42X6 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STR911FM42X6?
STR911FM42X6 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STR911FM42X6 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 STR911FM42X6?
For technical support, including STR911FM42X6 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STR911FM42X6 requirements.
6.How does Aetrix verify that STR911FM42X6 is sourced from the original manufacturer or authorized distributors?
All STR911FM42X6 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 STR911FM42X6 meets industry standards.
7.What is the process for return or replacement of STR911FM42X6?
All STR911FM42X6 units undergo pre-shipment inspection (PSI). If there is an issue with STR911FM42X6, 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 STR911FM42X6 part is unused and in its original packaging.
Return procedure for STR911FM42X6:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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