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NXP Semiconductors MM912J637AM2EP
- Part No.:
- MM912J637AM2EP
- Manufacturer:
- NXP Semiconductors
- Category:
- Application Specific Microcontrollers
- Package:
- -
- Datasheet:
-
MM912J637AM2EP.pdf
- Description:
- BATTERY SENSOR, LIN, 128KB FLASH
- Quantity:
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Inventory:1,300
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Product details
Overview
MM912J637AM2EP from NXP Semiconductors is an intelligent integrated precision battery sensor combining a 128 kB S12 MCU with SMARTMOS analog front-end for automotive 12 V lead-acid battery monitoring. It performs simultaneous high-accuracy current (via external shunt), voltage (direct battery+ sensing), and temperature (internal + optional external) measurement, all communicated over LIN 2.1. Used in battery management modules for start-stop systems and vehicle power diagnostics.
For engineers reviewing the MM912J637AM2EP datasheet, MM912J637AM2EP pinout, MM912J637AM2EP application, or MM912J637AM2EP equivalent, this page delivers verified technical context, validated pin functions, real-world use cases, and confirmed alternative parts - all grounded in NXP's MM912_637D1 Rev. 6.0 specification.
Technical Context
The MM912J637AM2EP integrates two dies: an analog die handling precision signal acquisition (16-bit ΣΔ ADC, PGA with auto-gain control, low-pass filtering, ±42 V input tolerance) and a separate S12 microcontroller die (128 kB Flash, 6 kB RAM, BDM debug). Communication between dies occurs via a dedicated die-to-die interface with clock, data, and interrupt lines.
It supports three operating modes: Normal (full functionality), Standby (current threshold detection + averaging), and Stop (ultra-low-power wake-up via LIN, periodic timer, or PTB3/L0 high-voltage input). The internal oscillator provides timing; an external quartz may be added for extended accuracy.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core MCU | S12 16-bit CPU with 128 kB Flash, 6 kB RAM, 4 kB DataFlash - enables embedded firmware execution and LIN protocol stack implementation. |
| Battery Voltage Range | 0 V to 42 V - supports full automotive battery swing including cranking dips and load dump transients without external protection circuitry. |
| Current Measurement | Shunt-based, 8 selectable ranges with PGA auto-gain - achieves high dynamic range and resolution across charge/discharge currents. |
| LIN Interface | LIN 2.1 compliant physical layer and protocol handler - enables direct connection to vehicle body control modules without external transceiver. |
| Temperature Sensing | Integrated on-die sensor + optional external TSUP/VTEMP inputs - allows correlated thermal compensation of voltage/current readings near battery terminals. |
| Supply Architecture | Dual-regulated outputs: VDDX (5.0 V MCU core), VDDH/VDDL (2.5 V analog & D2D buffer) - isolates noise-sensitive analog paths from digital switching. |
| Operating Temperature | –40 °C to 125 °C - qualified for under-hood placement adjacent to 12 V lead-acid batteries. |
Pinout & Package
MM912J637AM2EP uses a 48-pin HVQFN package (SOT619-16), 7 mm × 7 mm × 0.85 mm body, 0.5 mm pitch, wettable flank, thermal-enhanced EP. Pin 48 is the exposed pad (EP), electrically connected to GNDSUB for thermal and EMC performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ISENSEH / ISENSEL | Current Sense Differential Inputs | High- and low-side shunt connections enabling bidirectional current measurement with programmable gain and filtering. |
| VSENSE | Precision Battery Voltage Input | Direct connection point to battery positive pole; includes internal scaling and reverse-battery protection up to –40 V. |
| PTB3 / L0 | Wake-up Capable High-Voltage Input | 5.0 V-tolerant GPIO with internal clamping, configurable as LIN/SCI input or timer channel - enables robust wake-up from Stop mode. |
| LIN | LIN Bus Transceiver I/O | Single-wire, open-drain LIN physical layer interface with integrated driver/receiver and transient protection (>42 V ESD). |
| VSUP | Main Power Supply Input | Primary 12 V system input with reverse-battery diode support and >42 V ESD protection - powers internal regulators. |
| VDDX / VDDH / VDDL | Multi-Rail Power Outputs | Regulated 5.0 V (MCU core), 2.5 V (analog/D2D), and 2.5 V (low-power) supplies - decoupled to minimize cross-domain noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Gain Amplifier (PGA) | Auto-gain selection across 8 current ranges ensures optimal ADC utilization and resolution for both microamp standby and 100+ A cranking currents. |
| Low-Power Wake-up Logic | Hardware-accelerated current threshold detection and averaging in Standby mode eliminates MCU polling, reducing average current to <10 µA. |
| Dual-Die Architecture | Physically separated analog and MCU dies with dedicated die-to-die interface prevent digital noise from degrading precision sensor measurements. |
| Integrated LIN 2.1 PHY + Protocol | Eliminates need for external LIN transceiver; supports auto-synchronization, checksum, and error handling per LIN spec - reduces BOM and layout complexity. |
| Thermal-Enhanced QFN Package | Wettable flank and exposed pad enable reliable reflow soldering and efficient heat dissipation when mounted directly on battery terminal blocks. |
Applications
| Start-Stop System Monitoring | Battery Health Diagnostics |
|---|---|
|
Use Scenario: Real-time tracking of battery state-of-charge (SoC) and state-of-health (SoH) during repeated engine stop/start cycles in urban driving. IC Role / Device Role / Timing Role: Precision current integration and voltage decay profiling at sub-millisecond intervals during cranking and recharge phases. Use Value: Enables accurate SoC estimation without external coulomb counting ICs, supporting OEM fuel economy targets and warranty analytics. |
Use Scenario: Long-term logging of battery voltage sag, internal resistance drift, and temperature correlation during service life. IC Role / Device Role / Timing Role: High-stability analog front-end with factory-trimmed 16-bit ΣΔ ADC captures millivolt-level changes over years of operation. Use Value: Provides OEMs with field-relevant degradation metrics to refine battery replacement algorithms and extend service intervals. |
| 12 V System Power Distribution | Commercial Vehicle Telematics |
|
Use Scenario: Monitoring auxiliary loads (e.g., refrigeration units, liftgates) powered from chassis battery in delivery vans and RVs. IC Role / Device Role / Timing Role: Dual voltage sense (VSENSE + VOPT) and high-voltage wake-up (PTB3/L0) enable independent load current attribution and event-triggered reporting. Use Value: Supports fleet operators in identifying parasitic drains and verifying compliance with duty-cycle regulations without adding discrete sensors. |
Use Scenario: Integration into telematics control units (TCUs) for remote battery status reporting and predictive maintenance alerts. IC Role / Device Role / Timing Role: LIN 2.1 interface delivers standardized battery data (voltage, current, temp) to CAN gateway via LIN-to-CAN bridge. Use Value: Eliminates custom firmware development for battery telemetry, accelerating TCU certification and reducing validation effort. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MM912J637TM2EP | Same die, identical analog/MCU specs, but rated for –40 °C to 125 °C and packaged in SOT619-25(D) (0.9 mm height). | Preferred for new designs requiring full automotive temperature grade and enhanced thermal performance. | Select MM912J637TM2EP if board space allows taller package and full AEC-Q100 Grade 0 qualification is required. |
| MAX17205 | Standalone fuel gauge IC (no MCU, no LIN); uses ModelGauge m5 algorithm; measures via internal sense FET, not external shunt. | Targeted at portable electronics; lacks automotive voltage range, LIN interface, or high-voltage GPIOs. | Consider MAX17205 only for non-automotive, low-voltage (<5.5 V), shuntless battery monitoring where LIN connectivity is unnecessary. |
Compared with MM912J637AM2EP, MM912J637TM2EP offers identical functionality with improved thermal profile and full temperature grade, while MAX17205 serves a fundamentally different architecture - standalone fuel gauging without MCU or LIN - making it unsuitable for automotive battery sensor replacement.
Availability
MM912J637AM2EP is available at Aetrix Electronics and suitable for automotive start-stop systems, battery health diagnostics, 12 V power distribution monitoring, and commercial vehicle telematics requiring stable component supply across extended product lifecycles.
Supply support for MM912J637AM2EP 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 automotive-grade MCUs and analog front-ends.
The MM912J637AM2EP belongs to NXP's intelligent battery sensor product line, designed specifically to replace discrete voltage/current/temperature sensing circuits with a single AEC-Q100-qualified device for 12 V lead-acid battery monitoring in harsh automotive environments.
FAQ
What is the primary function of the MM912J637AM2EP in automotive systems?
The MM912J637AM2EP serves as an intelligent integrated precision battery sensor that simultaneously measures battery voltage (via VSENSE), current (via external shunt on ISENSEH/ISENSEL), and temperature (internal or external via VTEMP/TSUP), then communicates results over LIN 2.1. Its core purpose is to enable accurate state-of-charge and state-of-health estimation in 12 V lead-acid battery systems used in start-stop vehicles and commercial fleets. The MM912J637AM2EP integrates both analog sensing and MCU processing in one package.
Does the MM912J637AM2EP require an external LIN transceiver?
No, the MM912J637AM2EP includes a fully integrated LIN 2.1 physical layer and protocol handler. The LIN pin provides direct single-wire bus interface with built-in transient protection (>42 V ESD), pull-up/pull-down control, and automatic synchronization - eliminating the need for an external LIN transceiver. This integration reduces bill-of-materials cost and PCB area while ensuring conformance to LIN 2.1 specifications. The MM912J637AM2EP handles all physical layer signaling and frame-level communication internally.
What are the key differences between MM912J637AM2EP and MM912J637TM2EP?
The MM912J637AM2EP and MM912J637TM2EP share identical electrical specifications, MCU architecture (128 kB Flash), analog front-end, and feature set. Their differences are strictly packaging and qualification: MM912J637AM2EP uses SOT619-16 (0.85 mm height) and is marked "Not recommended for new design", while MM912J637TM2EP uses SOT619-25(D) (0.9 mm height) and is fully qualified for –40 °C to 125 °C operation. For new designs, NXP recommends MM912J637TM2EP due to its enhanced thermal profile and full automotive temperature grade.
Can the MM912J637AM2EP measure battery current without an external shunt resistor?
No, the MM912J637AM2EP requires an external shunt resistor (e.g., 100 µΩ) connected between ISENSEH and ISENSEL to perform current measurement. The device does not contain an integrated current-sense FET or Hall-effect sensor. Its analog front-end is optimized for differential voltage measurement across the shunt, with programmable gain amplification and 16-bit ΣΔ ADC conversion. The MM912J637AM2EP provides the precision signal chain and processing, but relies on the external shunt for current-to-voltage conversion.
How does the MM912J637AM2EP support low-power operation in vehicle sleep mode?
The MM912J637AM2EP supports ultra-low-power operation through hardware-accelerated wake-up logic in Standby mode: it continuously monitors current through the shunt using dedicated analog circuitry (threshold detection + averaging) without waking the S12 MCU core. Wake-up events can be triggered by LIN activity, periodic timer, or high-voltage assertion on PTB3/L0 - all consuming <10 µA average current. This enables long-term battery monitoring during vehicle sleep without excessive drain. The MM912J637AM2EP maintains full measurement capability while minimizing quiescent current.
MM912J637AM2EP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Applications:
- -
- Core Processor:
- -
- Program Memory Type:
- -
- Controller Series:
- -
- RAM Size:
- -
- Interface:
- -
- Number of I/O:
- -
- Voltage - Supply:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
MM912J637AM2EP FAQ
1.How can I place an order for MM912J637AM2EP through Aetrix?
Please submit a Request for Quotation (RFQ) for MM912J637AM2EP 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 MM912J637AM2EP reliable?
The price and inventory of MM912J637AM2EP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MM912J637AM2EP is usually 5 days.
3.What payment methods are accepted for MM912J637AM2EP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MM912J637AM2EP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MM912J637AM2EP?
MM912J637AM2EP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MM912J637AM2EP 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 MM912J637AM2EP?
For technical support, including MM912J637AM2EP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MM912J637AM2EP requirements.
6.How does Aetrix verify that MM912J637AM2EP is sourced from the original manufacturer or authorized distributors?
All MM912J637AM2EP 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 MM912J637AM2EP meets industry standards.
7.What is the process for return or replacement of MM912J637AM2EP?
All MM912J637AM2EP units undergo pre-shipment inspection (PSI). If there is an issue with MM912J637AM2EP, 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 MM912J637AM2EP part is unused and in its original packaging.
Return procedure for MM912J637AM2EP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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