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NXP Semiconductors MMA5124LCWR2
- Part No.:
- MMA5124LCWR2
- Manufacturer:
- NXP Semiconductors
- Category:
- Accelerometers
- Package:
- 16-QFN Exposed Pad
- Datasheet:
-
MMA5124LCWR2.pdf
- Description:
- ACCELEROMETER 240G PCM/SPI 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,227
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Product details
Overview
MMA5124LCWR2 from NXP Semiconductors is a Z-axis satellite accelerometer with ±240 g full-scale range, PSI5 Version 1.3 interface compliance, and overdamped mechanical sensing element (ζ = 1.75). It delivers 10-bit digital output at 400 Hz LPF bandwidth with 16 μs internal sample rate and interpolation to 1 μs resolution. Designed for airbag crash detection systems requiring AEC-Q100 Grade 1 qualification.
For engineers reviewing the MMA5124LCWR2 datasheet, MMA5124LCWR2 pinout, MMA5124LCWR2 application, or MMA5124LCWR2 equivalent, key selection criteria include PSI5 baud rate (125/190.5 kBaud), programmable time slot resolution (0.5 μs), daisy-chain capability via BUS_SW, and ±240 g range-specific sensitivity (2 LSB/g typical).
Technical Context
The MMA5124LCWR2 implements a ΣΔ ADC with SINC filter followed by configurable IIR low-pass filtering (3-pole or 4-pole) and single-pole high-pass filtering with fast startup. Its PSI5 encoder supports synchronous and asynchronous modes, programmable data length (8/10 bits), and error detection (even parity or 3-bit CRC).
Internally regulated supplies include VBUF (3.6–4.0 V), VREG (2.425–2.575 V), and VREGA (2.425–2.575 V), each requiring external decoupling capacitors. The device features integrated offset cancellation with two-stage operation and self-test functionality verified across temperature (-40 °C to +125 °C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Full-Scale Range | ±240 g - defines maximum measurable acceleration before clipping; enables high-g crash event detection in automotive restraint systems. |
| PSI5 Interface | Version 1.3 compliant - ensures interoperability with standard PSI5 host controllers used in automotive safety ECUs. |
| Low-Pass Filter | Selectable 400 Hz, 3-pole or 4-pole - provides anti-aliasing and noise suppression optimized for crash pulse analysis. |
| Sensitivity | 2 LSB/g (typical) - determines digital resolution per g; enables precise thresholding for deployment logic in airbag control units. |
| Operating Temperature | -40 °C to +125 °C - meets AEC-Q100 Grade 1 requirements for under-hood and passenger compartment mounting locations. |
| Package | 16-pin QFN, 6 mm × 6 mm × 1.98 mm - surface-mount footprint compatible with automated PCB assembly and thermal management in compact modules. |
| Supply Voltage | VCC: 4.2 V to 17.0 V - supports direct connection to vehicle battery rail with transient tolerance up to +25 V. |
Pinout & Package
Pb-free 16-pin QFN package, 6 mm × 6 mm × 1.98 mm body size with exposed die attach pad (internally connected to VSS). Thermal resistance θJC = 2.5 °C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | PSI5 Power & Data Line Supply | Supplies power via PSI5 bus; requires external decoupling capacitor (2.2 nF + 15 nF) and series resistor for current modulation. |
| IDATA | PSI5 Response Current Output | Modulates current on PSI5 line to encode acceleration data; supports 125/190.5 kBaud communication. |
| VBUF | Buffer Regulator Input | Feeds internal regulators (VREG/VREGA); provides EMC immunity and supply dropout resilience during transients. |
| BUS_SW | Daisy Chain Gate Drive | Drives external N-channel FET for optional PSI5 daisy chain topology; enables multi-sensor configurations without additional wiring. |
| VREG / VREGA | Digital / Analog Supply Outputs | Provide regulated 2.5 V supplies for digital logic and analog signal chain; require 1 μF X7R ceramic capacitors to VSS/VSSA. |
| VSS / VSSA | Digital / Analog Ground | Separate ground returns minimize noise coupling between digital switching and analog sensor front-end. |
Key Features
| Feature | Design Value |
|---|---|
| PSI5 Daisy Chain Support | Enables up to 4 sensors on single PSI5 bus using external low-side switch driven by BUS_SW pin - reduces wiring harness complexity and ECU pin count. |
| Programmable Time Slots | 0.5 μs resolution allows precise timing alignment of multiple sensors in distributed crash detection systems - critical for synchronized event capture. |
| Fast Startup High-Pass Filter | Eliminates DC offset within milliseconds while preserving low-frequency crash dynamics - avoids false triggers from vehicle vibration or tilt. |
| Integrated Self-Test | Verifies sensor functionality and signal chain integrity without external stimulus - satisfies ISO 26262 ASIL-B diagnostic coverage requirements. |
| Overdamped Z-Axis Sensing Element | ζ = 1.75 damping ratio suppresses resonance at 13.6 kHz - ensures flat frequency response up to 400 Hz for accurate crash pulse characterization. |
Applications
| Airbag Front Crash Detection | Airbag Side Impact Detection |
|---|---|
Use Scenario: Mounted in vehicle dashboard or steering column to detect frontal collision events exceeding 10 g within 10 ms. IC Role / Device Role / Timing Role: Primary Z-axis acceleration sensor providing real-time 10-bit PSI5 data stream to airbag control unit for deployment decision. Use Value: ±240 g range and 400 Hz LPF ensure reliable capture of high-slew-rate crash pulses while rejecting road noise below 10 Hz. | Use Scenario: Installed in door pillar or seat structure to detect lateral intrusion during side collisions. IC Role / Device Role / Timing Role: Satellite accelerometer reporting acceleration magnitude and timing via PSI5 daisy chain to central safety controller. Use Value: BUS_SW-driven daisy chain reduces cabling weight and connector count versus point-to-point wiring - critical for cost-sensitive side-impact modules. |
| Seat Belt Pretensioner Activation | Occupant Classification System |
Use Scenario: Integrated into seat frame to detect rapid deceleration indicating crash initiation for pretensioner firing. IC Role / Device Role / Timing Role: Fast-startup HPF and 16 μs sampling enable sub-5 ms latency from impact onset to pretensioner command. Use Value: Low-latency response (< 10 ms total system) meets FMVSS 208 requirements for occupant protection timing. | Use Scenario: Paired with pressure sensors in seat cushion to distinguish adult vs. child occupancy based on dynamic loading profile. IC Role / Device Role / Timing Role: Provides Z-axis acceleration signature during vehicle maneuvers to augment static weight classification. Use Value: 2 LSB/g sensitivity and < ±1 LSB post-compensation offset enable discrimination of subtle occupant motion patterns. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar inertial sensor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMA5112LCWR2 | ±120 g full-scale range; higher sensitivity (4 LSB/g); lower g-cell natural frequency (7 kHz) | Better suited for lower-g crash events where finer resolution is needed, but insufficient for high-speed frontal impacts | Select when system-level crash pulse modeling indicates peak acceleration remains below ±150 g |
| MMA5148LCWR2 | ±480 g full-scale range; reduced sensitivity (1 LSB/g); higher g-cell natural frequency (16.3 kHz) | Required for extreme crash scenarios (e.g., high-speed barrier tests) where ±240 g range would clip | Select when test data shows > ±220 g peaks in worst-case crash simulations |
Compared with MMA5112LCWR2 and MMA5148LCWR2, the MMA5124LCWR2 offers optimal balance of range, resolution, and bandwidth for mainstream automotive airbag systems - covering 95% of NCAP-rated crash events without clipping or excessive quantization error.
Availability
MMA5124LCWR2 is available at Aetrix Electronics and suitable for automotive safety systems, airbag control units, and occupant protection modules requiring stable component supply across extended production lifecycles.
Supply support for MMA5124LCWR2 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 company specializing in secure connectivity solutions for automotive, industrial, and IoT applications.
The MMA51xxL product line delivers PSI5-compliant inertial sensors designed specifically for automotive safety-critical systems requiring AEC-Q100 Grade 1 qualification and functional safety compliance.
FAQ
What is the full-scale range of the MMA5124LCWR2?
The MMA5124LCWR2 has a factory-programmed full-scale range of ±240 g. This range is fixed per device and defined by the RNG[2:0] bits in DEVCFG1 register (value 101). It provides optimal dynamic range for detecting high-magnitude crash events while maintaining sufficient resolution (2 LSB/g typical) for accurate thresholding in airbag control algorithms.
Does the MMA5124LCWR2 support daisy-chain configuration?
Yes, the MMA5124LCWR2 supports PSI5 daisy chaining via the BUS_SW pin, which drives an external N-channel MOSFET to connect VSS to VSS_OUT. This enables up to four sensors on a single PSI5 bus. Configuration requires setting the appropriate PSI5 command sequence and verifying timing parameters including tBUS_SW (≤300 μs activation) and tDC_BLANKING (200,000/fOSC).
What are the PSI5 communication options supported by the MMA5124LCWR2?
The MMA5124LCWR2 supports PSI5 Version 1.3 with selectable baud rates (125 kBaud or 190.5 kBaud), data lengths (8 or 10 bits), and error detection (even parity or 3-bit CRC). It operates in synchronous or asynchronous mode and allows programmable time slots with 0.5 μs resolution, all configurable via PSI5 commands written to DEVCFG registers.
How is the MMA5124LCWR2 qualified for automotive use?
The MMA5124LCWR2 is qualified to AEC-Q100 Revision G, Grade 1 (-40 °C to +125 °C), with tested survival against powered shock (±2000 g), unpowered shock (±2500 g), and electrostatic discharge (±4000 V HBM). Its design includes internal voltage monitors, self-test capability, and offset cancellation - meeting functional safety requirements for ASIL-B automotive safety applications.
What external components are required for stable operation of the MMA5124LCWR2?
Stable operation requires: C1/C2 (2.2 nF and 15 nF X7R ceramics) on VCC; C3 (470 pF X7R) on IDATA; C4–C6 (1 μF X7R) on VREG/VREGA/VBUF; R1 (82 Ω) and R2 (27 Ω) for VCC/IDATA filtering; and R3 (20 kΩ) plus M1 (N-channel MOSFET) for daisy chain implementation. All capacitors must meet 50 V minimum rating and X7R dielectric specification.
MMA5124LCWR2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- MMA
- Package/Case:
- 16-QFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- Selectable Low Pass Filter
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QFN (6x6)
MMA5124LCWR2 FAQ
1.How can I place an order for MMA5124LCWR2 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMA5124LCWR2 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 MMA5124LCWR2 reliable?
The price and inventory of MMA5124LCWR2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMA5124LCWR2 is usually 5 days.
3.What payment methods are accepted for MMA5124LCWR2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMA5124LCWR2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMA5124LCWR2?
MMA5124LCWR2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMA5124LCWR2 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 MMA5124LCWR2?
For technical support, including MMA5124LCWR2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMA5124LCWR2 requirements.
6.How does Aetrix verify that MMA5124LCWR2 is sourced from the original manufacturer or authorized distributors?
All MMA5124LCWR2 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 MMA5124LCWR2 meets industry standards.
7.What is the process for return or replacement of MMA5124LCWR2?
All MMA5124LCWR2 units undergo pre-shipment inspection (PSI). If there is an issue with MMA5124LCWR2, 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 MMA5124LCWR2 part is unused and in its original packaging.
Return procedure for MMA5124LCWR2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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