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NXP Semiconductors MM912JS812AMAFR2
- Part No.:
- MM912JS812AMAFR2
- Manufacturer:
- NXP Semiconductors
- Category:
- Application Specific Microcontrollers
- Package:
- 100-LQFP Exposed Pad
- Datasheet:
-
MM912JS812AMAFR2.pdf
- Description:
- IC DRVR INJECTOR/IGN 100LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:1,704
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Product details
Overview
MM912JS812AMAFR2 from NXP Semiconductors is a System-in-Package (SiP) engine control IC integrating an S12XS MCU (128 KB Flash, 8 KB RAM) and MC33812 analog power driver die for motorcycle and single-cylinder small-engine applications. It delivers injector drive (4.0 A typical), relay/fuel pump drive, lamp output (1.5 A), ISO-9141 K-Line diagnostics, and operates across 4.7–36 V VPWR.
For engineers reviewing the MM912JS812AMAFR2 datasheet, MM912JS812AMAFR2 pinout, MM912JS812AMAFR2 application, or MM912JS812AMAFR2 equivalent, this SiP enables compact ECU designs requiring integrated microcontroller logic, high-current power switching, fault monitoring, and automotive-grade serial diagnostics in one 100-pin LQFP-EP package.
Technical Context
The MM912JS812AMAFR2 combines two physically distinct dies in a single package: the S12XS MCU core with ECC-protected Flash, IPLL for EMC-optimized clocking, and 16-channel ATD; and the MC33812 analog die providing parallel-controlled low-side injector/relay outputs, high-side ignition drivers (IGNOUTH/IGNOUTL), and integrated fault reporting (INJFLT/RELFLT/IGNFLT).
Its architecture uses dedicated parallel I/O lines (e.g., INJIN, RIN, IGNIN, LAMPIN) from the MCU to directly control power outputs, while analog feedback signals (IGNFB, VCCSENS) and fault flags feed back into MCU GPIOs or ADC inputs-enabling closed-loop timing, current sensing, and safety monitoring without external signal conditioning.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core MCU | S12XS with 128 KB Flash, 8 KB RAM - provides deterministic real-time control and firmware storage for engine algorithms. |
| Power Supply Range | VPWR = 4.7 V to 36 V - supports wide battery voltage variation including cranking dips and load-dump transients in 12 V systems. |
| Injector Driver Output | INJOUT, 4.0 A typical - drives solenoid injectors directly without external MOSFETs; includes short-to-battery protection. |
| Ignition Driver Outputs | IGNOUTH (high-side) and IGNOUTL (low-side) - enable full-bridge or Darlington/IGBT ignition coil control with feedback via IGNFB. |
| Diagnostic Interface | ISO-9141 K-Line transceiver (MRX/MTX pins) - enables standardized OBD-II diagnostics using legacy automotive protocol. |
| Package | 100-pin LQFP-EP (98ASA00371D) - exposes thermal pad (EP) for enhanced power dissipation in high-duty-cycle engine control. |
| Operating Temperature | -40 °C to +125 °C - qualified for under-hood placement in motorcycles and small engines. |
Pinout & Package
Package: 100-pin LQFP-EP (exposed thermal pad), JEDEC MS-026AC, body size 14 mm × 14 mm, pitch 0.5 mm. EP must be soldered to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| INJOUT (Pin 17) | Low-side injector driver output | Directly switches injector ground path; rated 4.0 A typical; protected against short-to-battery and overtemperature. |
| IGNOUTH (Pin 27) | High-side ignition driver output | Supplies gate/base drive to external IGBT/Darlington; requires IGNSUP tie to VPWR or 5 V depending on device type. |
| IGNOUTL (Pin 26) | Low-side ignition driver output | Completes ignition coil current path; used with IGNOUTH in half-bridge configuration or standalone low-side drive. |
| IGNFB (Pin 29) | Voltage feedback input | Accepts 10:1 divided source voltage from ignition transistor for closed-loop current regulation and fault detection. |
| INJFLT (Pin 94) | Fault status output | Open-drain logic signal asserted low during injector open-circuit, overcurrent, or thermal shutdown - feeds MCU GPIO for error handling. |
| VPWR (Pin 33) | Main power supply input | Primary 12 V system rail input; requires reverse-battery protection, transient suppression, and 100 nF bypass capacitor. |
| RESETB (Pin 64 & 93) | Reset control (MCU input / analog output) | Active-low bidirectional reset line: driven by analog die during watchdog timeout or undervoltage; resets MCU core. |
| EP (Pin 101) | Exposed thermal pad | Must be connected to PCB ground plane; critical for thermal management of power drivers and overall junction temperature control. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated dual-die SiP architecture | Eliminates interposer routing and reduces board area by consolidating MCU + power driver functions in one package with shared ground and supply domains. |
| Parallel control interface | Dedicated digital I/O lines (INJIN, RIN, IGNIN, LAMPIN) allow deterministic, cycle-accurate timing of power outputs without SPI/I²C latency or protocol overhead. |
| Fault monitoring with direct reporting | Hardware-generated fault flags (INJFLT, RELFLT, IGNFLT) provide immediate, asynchronous notification to MCU - enabling fast fail-safe response without polling. |
| VCC pre-regulator with VCCREF/VCCSENS | On-chip 5.0 V regulator supplies MCU; VCCREF drives external PNP pass transistor while VCCSENS closes regulation loop - improves stability under dynamic load. |
| ISO-9141 K-Line physical layer | Integrated MRX/MTX transceiver supports standard OBD-II diagnostics at 10.4 kbaud; eliminates need for discrete level-shifting or bus driver ICs. |
Applications
| Motorcycle Engine Control Unit (ECU) | Small Engine Generator Control |
|---|---|
Use Scenario: Real-time fuel injection, ignition timing, and emissions control in air-cooled single-cylinder motorcycle engines. IC Role / Device Role / Timing Role: Central engine management SiP executing closed-loop spark advance, injector pulse-width modulation, and knock detection. Use Value: Reduces BOM count by integrating MCU, injector/ignition drivers, and diagnostics - enabling compact, cost-effective ECU designs meeting Euro 5 emission compliance. |
Use Scenario: Automated start-stop, load regulation, and fault logging in portable diesel/gasoline generators. IC Role / Device Role / Timing Role: Primary controller managing fuel delivery, alternator excitation, and safety shutdown sequences based on RPM, oil pressure, and temperature. Use Value: Delivers robust operation across wide ambient temperatures (-40 °C to 125 °C) and unstable input voltages (4.7–36 V), ensuring reliable generator startup and runtime. |
| ATV/UTV Powertrain Module | Marine Outboard Ignition System |
Use Scenario: Integrated powertrain control for all-terrain vehicles with throttle-by-wire, traction control, and CAN-based instrument cluster communication. IC Role / Device Role / Timing Role: Dual-role device: MCU executes vehicle dynamics algorithms while analog die drives high-current solenoids and relays for transmission and braking actuators. Use Value: Enables deterministic sub-millisecond injector/ignition timing via parallel I/O - critical for responsive throttle mapping and transient torque control. |
Use Scenario: Spark timing and fuel delivery control in 2-stroke/4-stroke marine outboard motors exposed to saltwater and vibration. IC Role / Device Role / Timing Role: Fault-tolerant ignition controller with IGNOUTH/IGNOUTL driving dual-coil ignition circuits and IGNFB-based current limiting. Use Value: Built-in short-to-battery protection and thermal shutdown prevent catastrophic failure during wet-environment faults - improving field reliability and service life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar engine control SiP applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MM912KS812AMAFR2 | 256 KB Flash, 12 KB RAM - larger code/data space for advanced diagnostics or multi-map calibration. | Preferred for ECUs requiring OTA updates, expanded sensor fusion, or dual-fuel (gasoline/LPG) support. | Select when firmware complexity exceeds 128 KB or future scalability is required; same pinout and peripheral set. |
| MC9S12XEP100 + MC33812 (discrete solution) | Separate MCU and driver ICs require PCB routing, additional decoupling, and external level-shifting for ISO-9141. | Suitable for prototyping or where SiP thermal constraints prevent use of LQFP-EP package. | Choose only if design requires independent replacement of MCU or driver, or if SiP qualification timeline is unacceptable. |
Compared with MM912JS812AMAFR2, the MM912KS812AMAFR2 offers higher memory capacity for feature-rich firmware, while the discrete MC9S12XEP100+MC33812 solution trades integration density for design flexibility and component-level sourcing control - neither is pin-compatible with MM912JS812AMAFR2 due to fundamental packaging and interconnect differences.
Availability
MM912JS812AMAFR2 is available at Aetrix Electronics and suitable for motorcycle ECU development, small-engine generator control, and ATV powertrain modules requiring stable component supply, long-term lifecycle assurance, and automotive-grade reliability.
Supply support for MM912JS812AMAFR2 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 specializing in secure connectivity solutions for automotive, industrial, and IoT applications, with deep expertise in microcontrollers and analog power integration.
The MM912JS812AMAFR2 belongs to NXP's SMARTMOS SiP product line, designed specifically to consolidate engine control logic and high-current power actuation into a single qualified package for cost-sensitive, space-constrained small-engine applications.
FAQ
What is the primary function of the MM912JS812AMAFR2 in an engine control system?
The MM912JS812AMAFR2 serves as a fully integrated engine control SiP, combining an S12XS MCU and MC33812 power driver die to execute real-time fuel injection, ignition timing, diagnostics, and safety monitoring. Its parallel I/O architecture allows deterministic control of injector, relay, lamp, and ignition outputs - making MM912JS812AMAFR2 ideal for compact, high-reliability small-engine ECUs where board space and BOM count are critical.
Does the MM912JS812AMAFR2 support CAN communication?
No, the MM912JS812AMAFR2 does not include a CAN controller. It features an msCAN 2.0B module on the S12XS die (accessible via PM0/RXCAN and PM1/TXCAN pins), but the published datasheet and pin definitions confirm these pins are not bonded out in the MM912JS812AMAFR2 SiP package. The device relies on ISO-9141 K-Line for diagnostics instead - meaning MM912JS812AMAFR2 is not suitable for CAN-based networked engine systems.
How is the MM912JS812AMAFR2 powered, and what external components are required?
The MM912JS812AMAFR2 is powered through VPWR (Pin 33), accepting 4.7–36 V DC. It integrates an internal 5.0 V pre-regulator supplied via VCCREF and VCCSENS; external components required include a 2.2 µF capacitor on VCCSENS, 100 nF bypass capacitors on VPWR and VDDX pins, and proper grounding of EP, PGND1, PGND2, and DGND to the PCB ground plane. No external 5 V supply is needed - the MM912JS812AMAFR2 generates its own regulated MCU supply.
What fault protection mechanisms are built into the MM912JS812AMAFR2?
The MM912JS812AMAFR2 includes hardware-level fault protection for all major power outputs: short-to-battery and overcurrent protection on INJOUT, ROUT, and LAMPOUT; thermal shutdown and open-load detection on injector and ignition channels; and dedicated fault flag outputs (INJFLT, RELFLT, IGNFLT) that assert low to notify the MCU. These protections operate independently of firmware - ensuring fail-safe behavior even during MCU lockup - and are integral to the MC33812 analog die within the MM912JS812AMAFR2 SiP.
Is the MM912JS812AMAFR2 pin-compatible with other members of the MM912_S812 family?
Yes, the MM912JS812AMAFR2 shares identical pinout, package (100-pin LQFP-EP), and peripheral mapping with MM912KS812AMAFR2 - differing only in Flash (128 KB vs. 256 KB) and RAM (8 KB vs. 12 KB). All analog driver pins (INJOUT, IGNOUTH, IGNOUTL, etc.), MCU I/O, and diagnostic interfaces are functionally and physically identical. This allows direct substitution in existing designs when increased memory is needed - confirming MM912JS812AMAFR2 as part of a scalable, pin-compatible SiP family.
MM912JS812AMAFR2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 100-LQFP Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Applications:
- Engine Control
- Core Processor:
- S12XS
- Program Memory Type:
- FLASH (128kB)
- Controller Series:
- HCS12
- RAM Size:
- 8K x 8
- Interface:
- CAN, SCI, SPI
- Number of I/O:
- 6
- Voltage - Supply:
- 4.7V ~ 36V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 100-LQFP-EP (14x14)
MM912JS812AMAFR2 FAQ
1.How can I place an order for MM912JS812AMAFR2 through Aetrix?
Please submit a Request for Quotation (RFQ) for MM912JS812AMAFR2 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 MM912JS812AMAFR2 reliable?
The price and inventory of MM912JS812AMAFR2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MM912JS812AMAFR2 is usually 5 days.
3.What payment methods are accepted for MM912JS812AMAFR2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MM912JS812AMAFR2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MM912JS812AMAFR2?
MM912JS812AMAFR2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MM912JS812AMAFR2 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 MM912JS812AMAFR2?
For technical support, including MM912JS812AMAFR2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MM912JS812AMAFR2 requirements.
6.How does Aetrix verify that MM912JS812AMAFR2 is sourced from the original manufacturer or authorized distributors?
All MM912JS812AMAFR2 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 MM912JS812AMAFR2 meets industry standards.
7.What is the process for return or replacement of MM912JS812AMAFR2?
All MM912JS812AMAFR2 units undergo pre-shipment inspection (PSI). If there is an issue with MM912JS812AMAFR2, 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 MM912JS812AMAFR2 part is unused and in its original packaging.
Return procedure for MM912JS812AMAFR2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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