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NXP Semiconductors MM912KS812AMAFR2
- Part No.:
- MM912KS812AMAFR2
- Manufacturer:
- NXP Semiconductors
- Category:
- Application Specific Microcontrollers
- Package:
- 100-LQFP Exposed Pad
- Datasheet:
-
MM912KS812AMAFR2.pdf
- Description:
- IC MCU 16BIT HCS12 100LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:2,531
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Product details
Overview
MM912KS812AMAFR2 from NXP Semiconductors is an engine control System-in-Package (SiP) integrating an S12XS MCU and MC33812 analog driver die for motorcycle and single-cylinder small engine applications. It features 256 KB flash, 12 KB RAM, operates from 4.7 V to 36 V VPWR, delivers 4.0 A injector drive current, and includes ISO-9141 K-Line transceiver for diagnostics.
For engineers reviewing the MM912KS812AMAFR2 datasheet, MM912KS812AMAFR2 pinout, MM912KS812AMAFR2 application, or MM912KS812AMAFR2 equivalent, this SiP enables compact, integrated control of ignition, fuel injection, relay, and lamp functions in harsh automotive-grade environments with built-in fault reporting and watchdog supervision.
Technical Context
The MM912KS812AMAFR2 combines two die in a single 100-pin LQFP-EP package: the S12XS MCU provides 16-bit CISC processing with ECC-protected flash, IPLL for EMC-optimized clocking, and 16-channel ATD; the MC33812 analog die implements high-side/low-side ignition drivers, 4.0 A injector output, 1.5 A lamp driver, and relay control-all with short-to-battery and overcurrent protection.
Power management includes a VCC pre-regulator delivering +5.0 V for MCU logic, independent VDDF/VDDPLL/VDDA rails for NVM, PLL, and ADC, and dedicated PGND/DGND domains. Fault monitoring is implemented via dedicated open-drain outputs (INJFLT, RELFLT, IGNFLT) tied directly to MCU GPIOs for real-time diagnostics.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Flash Memory | 256 KB - Stores full engine control firmware with ECC error correction for field reliability |
| RAM | 12 KB - Supports real-time sensor buffering, PID loop execution, and diagnostic data logging |
| Supply Voltage Range | 4.7 V to 36 V VPWR - Enables direct battery connection across cold-crank (≈6 V) to load-dump (≈36 V) conditions |
| Injector Drive Current | 4.0 A typical - Directly drives low-impedance fuel injectors without external MOSFETs |
| Lamp Driver Current | 1.5 A typical - Powers MIL (Malfunction Indicator Lamp) with integrated current limiting |
| Ignition Outputs | IGNOUTH (high-side) + IGNOUTL (low-side) - Configurable for IGBT or Darlington coil drivers with feedback (IGNFB) |
| Communication Interface | ISO-9141 K-Line - Integrated transceiver supports standardized OBD-II diagnostics without external level-shifting |
Pinout & Package
MM912KS812AMAFR2 is housed in a 100-pin LQFP-EP (exposed pad) package per drawing 98ASA00371D, requiring thermal connection of EP to PCB ground plane. Pin assignments are validated per Table 4 of NXP document MM912_S812 Rev. 2.0.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1–2, 7, 8, 11, 13, 15, 18–20, 25, 91 | NC | Unused pins - must remain unconnected per datasheet |
| 3 (MTX), 4 (MRX) | ISO9141 interface | Logic-level TX/RX between MCU SCI and internal K-Line transceiver |
| 9 (ROUT), 12 (LAMPOUT), 17 (INJOUT), 26–27 (IGNOUTL/IGNOUTH) | Power outputs | Low/high-side driver outputs with integrated current limit and short-circuit protection |
| 21 (WD_INH), 22–23 (TEST1/TEST2), 24 (TEST3), 93 (RESETB) | Control & reset | Watchdog inhibit, factory test inputs, and dual-purpose RESETB (input to MCU, output from analog die) |
| 48 (PT4), 89–90 (PS0/RXD, PS1/TXD) | MCU I/O | Configurable GPIOs supporting PWM, timer capture, SCI, and watchdog refresh (WDRFSH on PT4) |
| 94–96 (INJFLT, RELFLT, IGNFLT) | Fault reporting | Open-drain status outputs indicating driver faults - pulled up externally to VCC for MCU interrupt detection |
| 97–100 (INJIN, RIN, LAMPIN, IGNIN) | Parallel control inputs | Logic-level enable signals from MCU to activate corresponding power outputs |
| EP | Substrate ground | Exposed thermal pad - must be soldered to solid ground plane for thermal dissipation and EMI reduction |
Key Features
| Feature | Design Value |
|---|---|
| Integrated S12XS MCU + MC33812 driver | Single-package solution eliminates inter-die routing, reduces BOM count, and improves timing alignment between control logic and power stages |
| ECC-protected flash memory | Prevents silent corruption of engine control code during EMI exposure or voltage transients in automotive environments |
| IPLL frequency-modulated clock | Reduces electromagnetic emissions by spreading spectral energy - critical for passing CISPR 25 Class 5 compliance |
| Dedicated fault reporting outputs | INJFLT, RELFLT, IGNFLT provide immediate, hardware-level fault indication without software polling overhead |
| VCC pre-regulator with VCCREF/VCCSENS | Generates stable +5.0 V for MCU core from wide VPWR range - eliminates need for external LDO in most designs |
Applications
| Motorcycle Engine Control | Small Generator ECU |
|---|---|
|
Use Scenario: Real-time spark timing, fuel injection pulse width, and idle speed control for air-cooled single-cylinder engines. IC Role / Device Role / Timing Role: Primary engine management controller executing closed-loop AFR and knock control algorithms. Use Value: Integrates MCU computation and high-current driver stages in one package, reducing PCB area by >35% versus discrete solutions. |
Use Scenario: Automatic voltage regulation, load shedding, and fault shutdown in portable gasoline generators. IC Role / Device Role / Timing Role: Central system controller managing alternator excitation, fuel pump activation, and overload detection. Use Value: 4.0 A injector drive and 1.5 A lamp output enable direct actuation of generator solenoids and status indicators without external drivers. |
| ATV/UTV Powertrain | Marine Outboard Ignition |
|
Use Scenario: Throttle-by-wire mapping, gear position sensing, and emission-compliant combustion control in off-road vehicles. IC Role / Device Role / Timing Role: Safety-critical engine controller with watchdog supervision and ISO-9141 diagnostics for service access. Use Value: -40°C to 125°C operating range and surge-protected VPWR input ensure reliable operation in extreme temperature and vibration environments. |
Use Scenario: High-reliability ignition timing and coil charging control for 2-stroke marine outboards exposed to salt corrosion and moisture. IC Role / Device Role / Timing Role: Ignition system controller using IGNOUTH/IGNOUTL outputs to drive IGBT-based coil drivers with IGNFB feedback. Use Value: Integrated ignition fault reporting (IGNFLT) enables immediate spark loss detection and fail-safe engine shutdown per ISO 26262 ASIL-B requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar engine control SiP applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MM912JS812AMAFR2 | 128 KB flash, 8 KB RAM - lower memory capacity; identical pinout and peripheral set | Suitable for simpler engine calibrations with reduced map storage needs | Select when firmware size < 100 KB and diagnostic log depth is limited |
| MC9S12XEP100VLH | Standalone S12XEP MCU (no integrated drivers); requires external MC33812 or discrete FETs | Enables flexible layout and thermal separation but increases component count and design complexity | Choose for prototyping or applications needing custom driver configurations beyond SiP capabilities |
Compared with MM912KS812AMAFR2, MM912JS812AMAFR2 offers cost savings at the expense of firmware headroom, while MC9S12XEP100VLH trades integration for design flexibility - neither is pin-compatible, requiring PCB redesign.
Availability
MM912KS812AMAFR2 is available at Aetrix Electronics and suitable for motorcycle ECU development, small-engine generator control, and ATV powertrain applications requiring stable component supply across extended product lifecycles.
Supply support for MM912KS812AMAFR2 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 markets, with deep expertise in microcontrollers and power analog integration.
The MM912KS812AMAFR2 belongs to NXP's SMARTMOS SiP product line, designed specifically to consolidate engine control logic and high-current actuation into a single ruggedized package for cost-sensitive, space-constrained small-engine applications.
FAQ
What is the operating temperature range for the MM912KS812AMAFR2?
The MM912KS812AMAFR2 is rated for ambient temperatures from -40°C to +125°C, with junction temperature up to +150°C. This specification aligns with automotive under-hood requirements and ensures reliable operation in motorcycle and small-engine environments where thermal cycling and ambient extremes are common. The MM912KS812AMAFR2 achieves this through thermally optimized LQFP-EP packaging and internal thermal protection circuits.
Does the MM912KS812AMAFR2 include built-in watchdog functionality?
Yes, the MM912KS812AMAFR2 integrates a hardware watchdog circuit with dedicated WDRFSH (watchdog refresh) and WD_INH (watchdog inhibit) pins. The MCU must periodically assert WDRFSH to prevent timeout-induced RESETB assertion. WD_INH can be tied high to disable reset generation during debug or safe-mode operation. This dual-control architecture is documented in Section 4.2 of the MM912_S812 datasheet.
Can the MM912KS812AMAFR2 drive both low-side and high-side ignition coils?
Yes, the MM912KS812AMAFR2 provides dedicated IGNOUTL (low-side) and IGNOUTH (high-side) outputs, along with IGNSUP (ignition supply select) and IGNFB (feedback sense) pins. These enable direct driving of either Darlington or IGBT-based ignition coils. The IGNFB pin accepts a 10:1 voltage divider signal from the coil source, allowing closed-loop current monitoring - a capability confirmed in Figure 4 and Table 4 of the MM912_S812 datasheet.
What communication protocols does the MM912KS812AMAFR2 support natively?
The MM912KS812AMAFR2 includes a fully integrated ISO-9141 K-Line transceiver with MRX/MTX pins connected internally to the MCU's SCI module. It does not support CAN FD, LIN, or SENT natively - only ISO-9141 at standard baud rates. CAN 2.0B is supported via the PM0/RXCAN and PM1/TXCAN pins, but requires external CAN transceivers. This protocol mapping is explicitly defined in Figures 1–2 and Table 4 of the MM912_S812 datasheet.
Is the MM912KS812AMAFR2 pin-compatible with other members of the MM912_S812 family?
Yes, all MM912_S812 variants - including MM912JS812AMAFR2 and MM912KS812AMAFR2 - share identical 100-pin LQFP-EP footprints and pin functions. Differences are limited to flash (128 KB vs. 256 KB) and RAM (8 KB vs. 12 KB) capacities, with no changes to I/O mapping, power domains, or peripheral routing. This compatibility is confirmed in Table 1 and Section 2.3 of the MM912_S812 datasheet.
MM912KS812AMAFR2 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 (256kB)
- Controller Series:
- HCS12
- RAM Size:
- 12K 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)
MM912KS812AMAFR2 FAQ
1.How can I place an order for MM912KS812AMAFR2 through Aetrix?
Please submit a Request for Quotation (RFQ) for MM912KS812AMAFR2 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 MM912KS812AMAFR2 reliable?
The price and inventory of MM912KS812AMAFR2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MM912KS812AMAFR2 is usually 5 days.
3.What payment methods are accepted for MM912KS812AMAFR2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MM912KS812AMAFR2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MM912KS812AMAFR2?
MM912KS812AMAFR2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MM912KS812AMAFR2 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 MM912KS812AMAFR2?
For technical support, including MM912KS812AMAFR2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MM912KS812AMAFR2 requirements.
6.How does Aetrix verify that MM912KS812AMAFR2 is sourced from the original manufacturer or authorized distributors?
All MM912KS812AMAFR2 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 MM912KS812AMAFR2 meets industry standards.
7.What is the process for return or replacement of MM912KS812AMAFR2?
All MM912KS812AMAFR2 units undergo pre-shipment inspection (PSI). If there is an issue with MM912KS812AMAFR2, 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 MM912KS812AMAFR2 part is unused and in its original packaging.
Return procedure for MM912KS812AMAFR2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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