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NXP Semiconductors MMA5124LWR2
- Part No.:
- MMA5124LWR2
- Manufacturer:
- NXP Semiconductors
- Category:
- Accelerometers
- Package:
- 16-QFN Exposed Pad
- Datasheet:
-
MMA5124LWR2.pdf
- Description:
- ACCELEROMETER 240G PCM/SPI 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,190
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Product details
Overview
MMA5124LWR2 from NXP Semiconductors (formerly Freescale) is a Z-axis PSI5-compatible inertial sensor designed for automotive airbag crash detection. It delivers ±240g full-scale range, 10-bit digital output with ±2% non-linearity, 400 Hz selectable low-pass filtering, and operates across -40°C to +125°C per AEC-Q100 Grade 1. Its primary role is high-reliability acceleration sensing in front/side impact event detection.
For engineers reviewing the MMA5124LWR2 datasheet, MMA5124LWR2 pinout, MMA5124LWR2 application, or MMA5124LWR2 equivalent, key selection criteria include PSI5 v1.3 compliance, daisy-chain capability via BUS_SW, 16-pin QFN package (2086-01), ±240g range, and integrated offset cancellation with <±1 LSB residual error after compensation.
Technical Context
The MMA5124LWR2 implements a sigma-delta ADC with SINC filter and programmable IIR/HPF stages, enabling precise digitization of Z-axis acceleration. Its internal 4 MHz oscillator drives all timing-critical functions including PSI5 bit timing (125/190.5 kBaud), interpolation to 1 μs resolution, and offset cancellation stages operating at 10 Hz and 0.3 Hz.
PSI5 interface logic supports synchronous/asynchronous modes, configurable time slots (0.5 μs resolution), 8/10-bit data length, and error detection via even parity or 3-bit CRC. The device integrates analog/digital voltage regulators (VREGA/VREG), buffer regulator (VBUF), and dedicated low-side daisy-chain gate driver (BUS_SW) for multi-sensor networks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Full-Scale Range | ±240g - Enables detection of severe frontal/side collisions without saturation. |
| Output Resolution | 10-bit - Provides 480 LSB/g sensitivity and ±1 LSB post-compensation offset accuracy. |
| PSI5 Compliance | Version 1.3 - Ensures interoperability with automotive PSI5 master controllers and diagnostic tools. |
| Low-Pass Filter | Selectable 400 Hz, 3-pole or 4-pole - Suppresses high-frequency noise while preserving crash pulse fidelity. |
| Operating Temperature | -40°C to +125°C - Qualified to AEC-Q100 Grade 1 for under-hood and passenger compartment deployment. |
| Package | 16-pin QFN, 6×6 mm, case 2086-01 - Surface-mount footprint compatible with automotive PCB assembly standards. |
| Supply Voltage Range | VCC = 4.2 V to 17.0 V - Directly interfaces with vehicle battery rail (9–16 V) without external regulation. |
Pinout & Package
Pb-free 16-pin QFN package (case 2086-01), 6 mm × 6 mm, 0.5 mm pitch, exposed thermal pad internally connected to VSS.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | PSI5 Power & Data Line Supply | Connects to PSI5 bus through series resistor; powers internal circuitry and enables current-mode communication. |
| IDATA | PSI5 Response Current Output | Modulates current on PSI5 line for digital data transmission; requires external pull-up resistor. |
| VBUF | Buffer Regulator Input | Supplies isolated analog/digital rails (VREGA/VREG); provides EMC immunity and dropout resilience. |
| BUS_SW | Daisy-Chain Low-Side Switch Driver | Drives external N-MOSFET gate to enable multi-device PSI5 daisy chaining. |
| VREGA / VREG | Analog / Digital Internal Supplies | Stable 2.425–2.575 V outputs for sensor front-end and digital logic; require external 1 μF decoupling. |
| VSS / VSSA | Digital / Analog Ground | Separate ground returns minimize noise coupling between digital switching and analog signal chain. |
Key Features
| Feature | Design Value |
|---|---|
| PSI5 Daisy Chain Support | Enables up to 16 sensors on single two-wire bus using BUS_SW-driven external FET, reducing wiring harness complexity. |
| Programmable Time Slots | 0.5 μs resolution allows precise scheduling of sensor responses in multi-node systems, avoiding data collision. |
| Fast Startup HPF | Single-pole high-pass filter with rapid settling enables immediate crash detection without DC drift accumulation. |
| Self-Test Functionality | On-command mechanical excitation verifies g-cell integrity and signal chain functionality pre-deployment. |
| Integrated Offset Cancellation | Two-stage digital compensation reduces residual offset to <±1 LSB, eliminating need for external calibration. |
Applications
| Frontal Crash Detection | Side-Impact Sensing |
|---|---|
Use Scenario: Mounted in vehicle dashboard or radiator support to detect rapid deceleration during head-on collisions. IC Role / Device Role / Timing Role: Z-axis accelerometer providing real-time acceleration data to airbag control unit via PSI5 interface. Use Value: ±240g range captures high-g crash pulses without clipping; 400 Hz LPF preserves critical pulse shape for accurate crash severity classification. | Use Scenario: Installed in door pillar or B-pillar to sense lateral acceleration during T-bone or side-swipe impacts. IC Role / Device Role / Timing Role: Dedicated Z-axis satellite sensor feeding PSI5 data stream to central safety controller. Use Value: AEC-Q100 Grade 1 qualification ensures reliability in harsh cabin environments; daisy-chain capability simplifies multi-sensor integration. |
| Passenger Detection System | Occupant Classification Module |
Use Scenario: Integrated into seat structure to monitor occupant presence and position via low-level vibration and motion signatures. IC Role / Device Role / Timing Role: High-sensitivity inertial sensor detecting micro-movements and static load distribution. Use Value: 10-bit resolution and <±1 LSB post-compensation offset enable precise weight estimation and posture recognition. | Use Scenario: Used alongside pressure sensors in smart seat systems to classify occupant type (adult, child, empty) for adaptive airbag deployment. IC Role / Device Role / Timing Role: Z-axis acceleration reference for dynamic load modeling during vehicle maneuvers. Use Value: Programmable 8/10-bit data length and CRC error detection ensure robust data integrity in safety-critical decision loops. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PSI5 inertial sensor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMA5112LWR2 | ±120g full-scale range; lower sensitivity (4 LSB/g vs. 2 LSB/g at ±240g); identical PSI5 interface and package. | Suitable for lower-g crash zones (e.g., rear impact) where ±240g headroom is unnecessary. | Select when system-level crash pulse analysis confirms <±120g peak acceleration; reduces cost without sacrificing interface compatibility. |
| MMA5148LWR2 | ±480g full-scale range; higher overload tolerance (3300g positive clip); same pinout and PSI5 protocol stack. | Required for high-speed frontal crash testing or heavy-duty vehicle platforms with extreme deceleration profiles. | Choose for applications demanding extended dynamic range beyond ±240g, accepting reduced resolution per g (1 LSB/g). |
Compared with MMA5112LWR2 and MMA5148LWR2, the MMA5124LWR2 strikes optimal balance between range, resolution, and cost for mainstream automotive frontal/side airbag systems-delivering sufficient headroom for regulatory crash tests while maintaining high signal fidelity at typical deployment g-levels.
Availability
MMA5124LWR2 is available at Aetrix Electronics and suitable for automotive safety systems, airbag control units, and occupant detection modules requiring stable component supply and AEC-Q100-compliant performance.
Supply support for MMA5124LWR2 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.
The MMA51xxLW product line was engineered specifically for PSI5-based automotive safety systems, delivering high-integrity Z-axis acceleration sensing with built-in diagnostics and daisy-chain scalability.
FAQ
What is the full-scale acceleration range of the MMA5124LWR2?
The MMA5124LWR2 has a factory-programmed full-scale range of ±240g. This range is fixed for the MMA5124LWR2 variant and cannot be reconfigured in-system. It provides optimal sensitivity (2 LSB/g) and overload margin (up to +2800g/-1800g before g-cell clipping) for automotive frontal and side-impact detection scenarios.
Does the MMA5124LWR2 support daisy-chaining with other PSI5 sensors?
Yes, the MMA5124LWR2 supports daisy-chaining via its BUS_SW pin, which drives an external low-side N-channel MOSFET to connect VSS to VSS_OUT. When enabled, this allows multiple MMA5124LWR2 devices (or compatible PSI5 sensors) to share a single two-wire PSI5 bus, reducing wiring complexity in multi-sensor airbag systems.
What is the purpose of the VBUF pin on the MMA5124LWR2?
The VBUF pin on the MMA5124LWR2 connects to an internal buffer regulator that supplies both the analog (VREGA) and digital (VREG) internal voltage rails. This architecture isolates sensitive analog circuitry from digital switching noise and improves immunity to supply dropouts on the main VCC line-critical for reliable operation in automotive electrical environments.
How does the MMA5124LWR2 handle offset drift over temperature and time?
The MMA5124LWR2 implements a two-stage digital offset cancellation algorithm. Stage 1 operates at startup with 0.3 Hz cutoff, Stage 2 runs continuously at 0.1 Hz. After compensation, residual offset is limited to ±1 LSB (10-bit mode), verified across -40°C to +125°C. No external calibration is required.
Can the MMA5124LWR2 operate directly from a 12 V automotive battery rail?
Yes, the MMA5124LWR2 accepts VCC from 4.2 V to 17.0 V, making it compatible with unregulated 12 V battery inputs. Its internal regulators (VBUF, VREG, VREGA) condition this input to stable 3.8 V, 2.5 V, and 2.5 V supplies. External decoupling capacitors (1 μF each on VREG/VREGA, 500–1500 nF on VBUF) are mandatory per the datasheet.
MMA5124LWR2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 16-QFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Digital
- Axis:
- Z
- Acceleration Range:
- ±240g
- Sensitivity (LSB/g):
- 2
- Sensitivity (mV/g):
- -
- Bandwidth:
- -
- Output Type:
- PCM, SPI
- Voltage - Supply:
- 4.2V ~ 17V
- Features:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QFN (6x6)
MMA5124LWR2 FAQ
1.How can I place an order for MMA5124LWR2 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMA5124LWR2 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 MMA5124LWR2 reliable?
The price and inventory of MMA5124LWR2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMA5124LWR2 is usually 5 days.
3.What payment methods are accepted for MMA5124LWR2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMA5124LWR2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMA5124LWR2?
MMA5124LWR2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMA5124LWR2 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 MMA5124LWR2?
For technical support, including MMA5124LWR2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMA5124LWR2 requirements.
6.How does Aetrix verify that MMA5124LWR2 is sourced from the original manufacturer or authorized distributors?
All MMA5124LWR2 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 MMA5124LWR2 meets industry standards.
7.What is the process for return or replacement of MMA5124LWR2?
All MMA5124LWR2 units undergo pre-shipment inspection (PSI). If there is an issue with MMA5124LWR2, 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 MMA5124LWR2 part is unused and in its original packaging.
Return procedure for MMA5124LWR2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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