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NXP Semiconductors S912XET256J2MAA
- Part No.:
- S912XET256J2MAA
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 80-QFP
- Datasheet:
-
S912XET256J2MAA.pdf
- Description:
- IC MCU 16BIT 256KB FLASH 80QFP
- Quantity:
- Payment:
- Shipping:
Inventory:2,523
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Product details
Overview
S912XET256J2MAA from NXP Semiconductors (formerly Freescale) is a 16-bit HCS12X microcontroller featuring a 256 KB on-chip flash memory, 14 KB RAM, and a 50 MHz S12X CPU core with XGATE co-processor support. It integrates dual CAN 2.0B controllers, 12-bit ADC with 16 channels, 8-channel PWM, and enhanced capture timer modules. Designed for automotive body control and powertrain subsystems, it operates across –40°C to 125°C and supports BDM debug interface.
For engineers reviewing the S912XET256J2MAA datasheet, S912XET256J2MAA pinout, S912XET256J2MAA application, or S912XET256J2MAA equivalent, key selection criteria include its 256 KB flash size, dual MSCAN compliance, 50 MHz execution speed, extended temperature grade, and 112-pin LQFP package - all critical for ECU firmware scalability, real-time CAN messaging, and ASIL-B–aligned functional safety designs.
Technical Context
The S912XET256J2MAA implements the S12X CPU12XV2 core with 5-stage pipeline, 16-bit data bus, and 24-bit address space. Its XGATE coprocessor handles time-critical peripheral tasks independently, offloading the main CPU and enabling deterministic response in motor control and sensor acquisition loops.
It features two independent MSCAN modules compliant with ISO 11898-1:2003, each supporting programmable bit timing, message buffering, and hardware filtering. The integrated 12-bit ADC (ADC12B16CV1) provides up to 16 input channels with configurable sample-and-hold and external trigger synchronization via ECT or PIT modules.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | S12X 16-bit CPU with 5-stage pipeline and 24-bit addressing - enables efficient code density and direct access to >64 KB memory space without banking. |
| Flash Memory | 256 KB on-chip flash (S12XFTM256K2V1 module) - supports in-application programming (IAP), EEPROM emulation, and secure boot partitioning. |
| RAM Size | 14 KB on-chip RAM - sufficient for real-time task stacks, CAN message buffers, and ADC result arrays in automotive ECUs. |
| Clock Speed | 50 MHz maximum core frequency - delivers 50 MIPS performance for deterministic control loop execution under worst-case timing. |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive applications including engine control and transmission modules. |
| CAN Interfaces | Dual MSCAN 2.0B modules - each supports 64 message objects, hardware ID filtering, and error confinement for fault-tolerant vehicle networks. |
| ADC Resolution | 12-bit ADC with 16 input channels (ADC12B16CV1) - provides 1.2 mV LSB at 5 V reference for precise battery voltage and sensor signal monitoring. |
Pinout & Package
Package: 112-pin LQFP (16 × 16 mm, 0.4 mm pitch), RoHS-compliant, moisture sensitivity level 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PT0–PT7 | Port T general-purpose I/O | 8-bit bidirectional port with interrupt capability and polarity-selectable edge detection for wake-up or status monitoring. |
| PTA0–PTA7 | Port A analog/digital I/O | Configurable as ADC inputs (AD0[0]–AD0[7]) or digital GPIO - supports simultaneous sampling of multiple sensors. |
| CAN0_TX / CAN0_RX | Controller Area Network channel 0 differential pair | Direct connection to external CAN transceiver (e.g., MC33883); supports 1 Mbit/s baud rate with built-in loopback test mode. |
| CAN1_TX / CAN1_RX | Controller Area Network channel 1 differential pair | Independent second CAN bus for gateway or domain controller functions; isolated from CAN0 for redundancy and bandwidth separation. |
| RESET | Active-low reset input | Asynchronous reset with internal pull-up; accepts external watchdog or power-on reset assertion with 200 ns minimum pulse width. |
| BKGD | Background Debug pin | Single-wire BDM interface for flash programming, breakpoint debugging, and real-time register inspection without halting CPU operation. |
Key Features
| Feature | Design Value |
|---|---|
| XGATE co-processor | 32-bit RISC engine with 2 KB local RAM - executes time-critical ISR routines (e.g., PWM update, ADC post-processing) without CPU intervention. |
| Dual MSCAN modules | Each with 64 message object RAM, hardware acceptance filtering, and bus-off recovery - enables concurrent CAN FD–ready network management and diagnostics. |
| Enhanced Capture Timer (ECT) | 16-bit timer with 8 input capture/compare channels and quadrature decoder - supports precise RPM measurement and motor commutation timing. |
| Memory Protection Unit (MPU) | Configurable region-based protection for flash, RAM, and peripherals - enforces privilege levels and prevents accidental writes to critical registers or boot sectors. |
| Voltage Regulator (VREG) | On-chip 3.3 V regulator with internal bandgap reference - eliminates need for external LDO in cost-sensitive ECU designs while maintaining ±2% output tolerance. |
Applications
| Body Control Module (BCM) | Engine Control Unit (ECU) |
|---|---|
Use Scenario: Centralized management of lighting, door locks, window lifts, and HVAC actuators in modern vehicles. IC Role / Device Role / Timing Role: Main system controller coordinating LIN slave nodes, driving high-side/low-side power switches, and executing diagnostic routines. Use Value: Dual CAN interfaces enable seamless integration with instrument cluster and infotainment systems; 256 KB flash accommodates evolving feature sets over product lifetime. |
Use Scenario: Real-time fuel injection timing, ignition spark control, and exhaust gas recirculation (EGR) valve actuation. IC Role / Device Role / Timing Role: Primary engine management MCU synchronizing crank/cam sensor inputs, calculating combustion timing, and generating PWM-driven injector pulses. Use Value: 50 MHz core speed ensures sub-microsecond response to knock sensor events; ECT module delivers 100 ns input capture resolution for precise crankshaft position tracking. |
| Transmission Control Module (TCM) | Electric Power Steering (EPS) |
Use Scenario: Gear shift logic, torque converter clutch control, and hydraulic pressure regulation in automatic transmissions. IC Role / Device Role / Timing Role: Safety-critical controller interfacing with solenoid drivers, temperature sensors, and vehicle speed signals via CAN. Use Value: MPU-enforced memory isolation separates application code from safety monitor firmware; extended temperature rating ensures reliability in transmission oil-cooled environments. |
Use Scenario: Torque assist calculation, motor phase current control, and steering angle feedback processing in column-assist EPS systems. IC Role / Device Role / Timing Role: Real-time motor controller managing FOC (field-oriented control) loops using ADC-sampled current feedback and PWM-modulated gate drivers. Use Value: XGATE offloads motor commutation timing and PID calculations from main CPU, freeing 30%+ cycles for higher-layer diagnostics and CAN communication. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC9S12XEP100MAL | 1 MB flash, 64 KB RAM, same 112-pin LQFP package and pin-compatible pinout - but lacks XGATE and uses older maskset. | Targeted at next-generation ECUs requiring larger firmware footprint and future-proofing; not drop-in due to different memory map initialization. | Select when scaling beyond 256 KB flash is required and XGATE is not needed; verify CRG and PIM register compatibility during migration. |
| S912XEQ512J2MAA | 512 KB flash, identical core, XGATE, and peripheral set - same 112-pin LQFP package with fully compatible pinout and register mapping. | Drop-in upgrade path for applications needing more code space for OTA updates, cybersecurity stacks, or expanded diagnostics. | Preferred for long-lifecycle automotive programs where flash headroom is critical; no PCB or firmware changes required beyond linker script adjustment. |
Compared with MC9S12XEP100MAL, S912XET256J2MAA offers deterministic real-time performance via XGATE and tighter thermal qualification, while S912XEQ512J2MAA provides seamless scalability with identical architecture and pinout - making both viable alternatives depending on flash budget and compute offload requirements.
Availability
S912XET256J2MAA is available at Aetrix Electronics and suitable for automotive body control modules, engine management systems, and transmission control units requiring stable component supply, long-term lifecycle assurance, and AEC-Q100 Grade 1 qualification.
Supply support for S912XET256J2MAA 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
NXP Semiconductors is a global semiconductor leader focused on secure connectivity solutions for automotive, industrial, and IoT markets, with deep heritage in automotive microcontrollers dating back to Motorola's 68HC11.
The S912XET256J2MAA belongs to the HCS12X family, engineered specifically for automotive electronic control units demanding high reliability, functional safety compliance (ISO 26262-ready), and robust real-time peripheral integration.
FAQ
What is the maximum operating frequency of the S912XET256J2MAA?
The S912XET256J2MAA operates at a maximum core frequency of 50 MHz, achieved via its internal PLL with external crystal oscillator input (typically 4–8 MHz). This delivers 50 MIPS performance for deterministic execution of control algorithms and CAN message handling in automotive applications. The S912XET256J2MAA maintains this speed across its full –40°C to +125°C operating range with guaranteed timing margins.
Does the S912XET256J2MAA support CAN FD?
No, the S912XET256J2MAA integrates two legacy MSCAN 2.0B modules compliant with ISO 11898-1:2003, supporting classical CAN up to 1 Mbit/s only. It does not implement CAN FD physical layer arbitration or flexible data-rate framing. For CAN FD, designers must select newer S32K or MPC57xx families; the S912XET256J2MAA remains suited for established CAN 2.0B networks in Tier 1 ECU designs.
How is debug supported on the S912XET256J2MAA?
The S912XET256J2MAA uses the Background Debug Mode (BDM) interface via the BKGD pin, supporting single-wire in-circuit debugging, flash programming, and real-time register inspection without halting CPU execution. It requires an NXP-compatible BDM pod (e.g., U-Multilink) and CodeWarrior Development Studio v10.x or earlier. No JTAG or SWD interface is present on the S912XET256J2MAA.
What is the role of the XGATE coprocessor in the S912XET256J2MAA?
The XGATE coprocessor in the S912XET256J2MAA is a 32-bit RISC engine with dedicated 2 KB RAM that executes time-critical peripheral service routines independently of the main S12X CPU. It handles ADC post-processing, PWM synchronization, and CAN message buffering - reducing main CPU load by up to 30% and enabling deterministic latency for motor control and sensor acquisition loops in the S912XET256J2MAA.
Is the S912XET256J2MAA qualified for automotive use?
Yes, the S912XET256J2MAA is AEC-Q100 qualified for Grade 1 (–40°C to +125°C) operation and designed for automotive electronic control units. It includes features essential for functional safety, such as memory protection unit (MPU), clock monitor, COP watchdog, and fail-safe reset behavior - making it suitable for ASIL-B–aligned systems like BCM, TCM, and EPS when implemented per ISO 26262 guidelines. The S912XET256J2MAA has been deployed in production vehicles since 2010.
S912XET256J2MAA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 80-QFP
- Series:
- HCS12X
- Packaging:
- Tray
- Product Status:
- Active
- Programmable:
- Not Verified
- Core Processor:
- HCS12X
- Core Size:
- 16-Bit
- Speed:
- 50MHz
- Connectivity:
- CANbus, EBI/EMI, I2C, IrDA, SCI, SPI
- Peripherals:
- LVD, POR, PWM, WDT
- Number of I/O:
- 59
- Program Memory Size:
- 256KB (256K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- 4K x 8
- RAM Size:
- 16K x 8
- Voltage - Supply (Vcc/Vdd):
- 1.72V ~ 5.5V
- Data Converters:
- A/D 8x12b
- Oscillator Type:
- External
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
S912XET256J2MAA FAQ
1.How can I place an order for S912XET256J2MAA through Aetrix?
Please submit a Request for Quotation (RFQ) for S912XET256J2MAA 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 S912XET256J2MAA reliable?
The price and inventory of S912XET256J2MAA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for S912XET256J2MAA is usually 5 days.
3.What payment methods are accepted for S912XET256J2MAA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for S912XET256J2MAA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for S912XET256J2MAA?
S912XET256J2MAA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your S912XET256J2MAA 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 S912XET256J2MAA?
For technical support, including S912XET256J2MAA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your S912XET256J2MAA requirements.
6.How does Aetrix verify that S912XET256J2MAA is sourced from the original manufacturer or authorized distributors?
All S912XET256J2MAA 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 S912XET256J2MAA meets industry standards.
7.What is the process for return or replacement of S912XET256J2MAA?
All S912XET256J2MAA units undergo pre-shipment inspection (PSI). If there is an issue with S912XET256J2MAA, 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 S912XET256J2MAA part is unused and in its original packaging.
Return procedure for S912XET256J2MAA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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