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STMicroelectronics STR912FW42X6
- Part No.:
- STR912FW42X6
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 128-LQFP
- Datasheet:
-
STR912FW42X6.pdf
- Description:
- IC MCU 32BIT 256KB FLASH 128LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:4,879
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Product details
Overview
STR912FW42X6 from STMicroelectronics is a 16/32-bit ARM966E-S-based microcontroller featuring dual-burst Flash (512KB + 32KB), 96KB SRAM with optional battery backup, and integrated 10/100 Ethernet MAC, USB Full-Speed slave, CAN 2.0B, and 3-phase induction motor controller. It operates at up to 96 MHz (96 MIPS from Flash), supports 8-channel 10-bit ADC (0.7 µs conversion), and targets industrial motor control and protocol gateway applications.
For engineers reviewing the STR912FW42X6 datasheet, STR912FW42X6 pinout, STR912FW42X6 application, or STR912FW42X6 equivalent, key selection criteria include its ARM966E-S core with Harvard architecture and TCM interfaces, dual Flash banks enabling secure firmware updates, deterministic interrupt latency via Branch Cache and VIC, and EMI bus support for external memory expansion in LQFP128 packaging.
Technical Context
The STR912FW42X6 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 branch cache and 4-instruction prefetch queue, eliminating instruction cache stalls and reducing interrupt latency.
It integrates a dedicated 3-phase IMC with dead-time generation, emergency stop, and tachometer input; a 10/100 Ethernet MAC with DMA and MII; and dual Flash banks (512KB main + 32KB secondary) rated for ≥100K erase cycles and 20-year data retention. Power management supports Run, Idle, and Sleep modes 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 Clock Speed | 96 MHz - delivers 96 MIPS directly from Flash without external SDRAM or instruction cache |
| Flash Memory | 512KB main + 32KB secondary burst Flash - enables secure dual-bank firmware updates and boot partitioning |
| SRAM | 96KB, 32-bit wide, optionally battery-backed - supports real-time data logging and RTC-critical variables |
| ADC | 8-channel, 10-bit, 0–3.6 V range, 0.7 µs conversion - suitable for fast analog feedback in motor control loops |
| Timers | 4 × 16-bit standard timers with input capture, output compare, PWM, and pulse count - configurable for encoder interfacing and PWM generation |
| Motor Control | Integrated 3-phase IMC with 3 PWM pairs, adjustable center alignment, dead-time insertion, and emergency stop - eliminates need for external gate driver logic |
Pinout & Package
LQFP128 package (14 × 14 mm, 0.4 mm pitch), thermally enhanced for industrial ambient operation up to +85°C. Pin functions validated per STMicroelectronics datasheet Rev 4 (Feb 2007), Table 4.1 and Figure 4.1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VDDQ | Core & I/O power supplies | Separate 1.8 V ±10% core supply and 2.7–3.6 V I/O supply - enables mixed-voltage system interfacing and low-power core operation |
| OSC_IN / OSC_OUT | External crystal oscillator interface | Supports 4–25 MHz crystal - feeds internal PLL to generate 96 MHz system clock with stable jitter performance |
| ETH_MDC / ETH_MDIO | Ethernet management interface | IEEE 802.3-compliant MDIO/MDC for PHY configuration - enables auto-negotiation and link status monitoring without software overhead |
| CAN_RX / CAN_TX | CAN 2.0B physical layer interface | Differential signaling compliant with ISO 11898-1 - supports robust fieldbus communication up to 1 Mbps in noisy industrial environments |
| USB_DP / USB_DM | USB 2.0 Full-Speed differential pair | 12 Mbps endpoint interface with integrated transceiver - eliminates need for external USB PHY in device-mode applications |
| EMI_A[0:22] / EMI_D[0:15] | External memory interface bus | 8/16-bit multiplexed address/data bus - supports NOR Flash, SRAM, and FPGA co-processor expansion in gateway or HMI designs |
Key Features
| Feature | Design Value |
|---|---|
| Branch Cache + Prefetch Queue | 4-entry branch cache + 4-instruction prefetch queue - reduces CPU stall on loop branches and interrupts, ensuring deterministic <1 µs VIC response |
| Dual-Bank Flash Architecture | 512KB main + 32KB secondary Flash - enables atomic firmware updates and bootloader isolation without external memory |
| Integrated 3-Phase IMC | Dedicated PWM timing unit with dead-time control, emergency stop, and tachometer input - replaces discrete motor control ICs in HVAC and pump drives |
| Embedded Trace Module (ETM9) | ARM ETM9 v.r2p2 with 9-pin trace port - provides non-intrusive real-time instruction trace for complex control algorithm validation |
| Flexible Power Management | Run/Idle/Sleep modes with 50 µA Sleep current - extends battery life in portable industrial diagnostics tools and remote sensors |
Applications
| Industrial Motor Drive | Protocol Gateway |
|---|---|
|
Use Scenario: Closed-loop speed and torque control of 3-phase AC induction motors in HVAC blowers and conveyor systems. IC Role / Device Role / Timing Role: Real-time execution of FOC or V/f algorithms using IMC PWM outputs, ADC current sensing, and timer-based encoder capture. Use Value: Eliminates external motor control ASICs; 96 MHz deterministic timing ensures <2 µs PWM update jitter for smooth torque delivery. |
Use Scenario: Bridging Modbus RTU over RS-485 to Ethernet/IP or TCP/IP in factory floor PLC networks. IC Role / Device Role / Timing Role: Dual-interface protocol translation engine with Ethernet MAC and UARTs handling concurrent packet framing, checksum, and buffer management. Use Value: On-chip DMA channels offload CPU from 10/100 Mbps Ethernet and multi-UART traffic, sustaining >10 kpps throughput at <15% CPU load. |
| Secure Access Terminal | Medical Infusion Pump Controller |
|
Use Scenario: Tamper-resistant door lock controller with RFID reader, keypad, and audit log storage. IC Role / Device Role / Timing Role: Secure runtime environment leveraging RTC tamper detection, battery-backed SRAM for event logs, and encrypted Flash storage. Use Value: Hardware-level tamper response (RTC alarm + immediate SRAM wipe) meets EN 50131 Grade 3 intrusion detection requirements. |
Use Scenario: Precision fluid delivery system requiring calibrated flow rate control, pressure monitoring, and safety interlocks. IC Role / Device Role / Timing Role: Safety-critical controller managing ADC pressure/flow readings, PWM-driven stepper drivers, and watchdog-monitored fault shutdown. Use Value: Independent brown-out monitor and hardware reset supervisor ensure fail-safe shutdown before voltage collapse compromises dose accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ARM9-based microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STM32F407VGT6 | Cortex-M4F core (168 MHz), no integrated Ethernet MAC or CAN transceiver PHY, single Flash bank (1 MB), no IMC | Requires external PHY for Ethernet; lacks hardware motor control peripherals - needs software-based PWM and dead-time management | Preferred for cost-sensitive, high-CPU-throughput apps where Ethernet/CAN are optional and motor control is simplified |
| LPC2478FBD208 | ARM7TDMI-S core (72 MHz), 512KB Flash, 96KB SRAM, Ethernet MAC, USB, CAN - no IMC, no branch cache, lower interrupt determinism | No integrated 3-phase PWM timing - requires GPIO-timed PWM or external motor driver; slower real-time response than STR912F | Suitable for legacy ARM7 migration where deterministic motor control is not required and toolchain continuity matters |
Compared with STM32F407VGT6 and LPC2478FBD208, the STR912FW42X6 uniquely combines ARM9-level performance with hardware-accelerated motor control, dual-bank Flash security, and deterministic Ethernet/CAN timing - making it irreplaceable in certified industrial drive and gateway designs where those features are mandatory.
Availability
STR912FW42X6 is available at Aetrix Electronics and suitable for industrial motor drives, protocol gateways, secure access terminals, and medical infusion pump controllers requiring stable component supply across extended product lifecycles.
Supply support for STR912FW42X6 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 semiconductors since 1987.
The STR91xF series was developed as an industrial-grade ARM9 solution targeting deterministic real-time control, integrated connectivity (Ethernet/USB/CAN), and functional safety-ready peripherals - specifically for factory automation and critical embedded systems.
FAQ
Is STR912FW42X6 still in active production?
No - STR912FW42X6 is marked obsolete by STMicroelectronics per official documentation (Rev 4, Feb 2007). However, Aetrix Electronics maintains legacy inventory with full traceability, extended warranty, and engineering support for ongoing production programs requiring this specific variant.
What is the maximum operating temperature range?
The STR912FW42X6 is specified for −40°C to +85°C ambient operation, validated per ST's electrical characteristics tables (Section 6.2) and thermal data (Section 7.1). This rating applies to the LQFP128 package under natural convection conditions with PCB copper pour per JEDEC JESD51-2.
Does it support in-system programming (ISP) via UART?
Yes - the STR912FW42X6 supports UART-based ISP using the built-in ROM bootloader, as documented in Section 2.15.1. It requires no external debugger; only a 3.3 V UART interface and correct boot pin configuration (BOOT0 = 1, BOOT1 = 0) are needed to enter ISP mode and reprogram Flash.
Can the 3-phase IMC drive BLDC motors?
Yes - while optimized for induction motors, the IMC's 3 independent PWM pairs with programmable dead-time, center-aligned mode, and emergency stop can be configured for trapezoidal or sinusoidal BLDC commutation. Application Note AN2835 confirms validated BLDC use cases using the same IMC peripheral.
STR912FW42X6 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 128-LQFP
- Series:
- STR9
- Packaging:
- Tray
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Core Processor:
- ARM9®
- Core Size:
- 16/32-Bit
- Speed:
- 96MHz
- Connectivity:
- CANbus, EBI/EMI, Ethernet, I2C, IrDA, Microwire, SPI, SSI, SSP, UART/USART, USB
- Peripherals:
- Brown-out Detect/Reset, DMA, Motor Control PWM, POR, PWM, WDT
- Number of I/O:
- 80
- 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:
STR912FW42X6 FAQ
1.How can I place an order for STR912FW42X6 through Aetrix?
Please submit a Request for Quotation (RFQ) for STR912FW42X6 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 STR912FW42X6 reliable?
The price and inventory of STR912FW42X6 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STR912FW42X6 is usually 5 days.
3.What payment methods are accepted for STR912FW42X6?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STR912FW42X6 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STR912FW42X6?
STR912FW42X6 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STR912FW42X6 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 STR912FW42X6?
For technical support, including STR912FW42X6 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STR912FW42X6 requirements.
6.How does Aetrix verify that STR912FW42X6 is sourced from the original manufacturer or authorized distributors?
All STR912FW42X6 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 STR912FW42X6 meets industry standards.
7.What is the process for return or replacement of STR912FW42X6?
All STR912FW42X6 units undergo pre-shipment inspection (PSI). If there is an issue with STR912FW42X6, 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 STR912FW42X6 part is unused and in its original packaging.
Return procedure for STR912FW42X6:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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