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NXP Semiconductors MMA5124KW
- Part No.:
- MMA5124KW
- Manufacturer:
- NXP Semiconductors
- Category:
- Accelerometers
- Package:
- 16-QFN Exposed Pad
- Datasheet:
-
MMA5124KW.pdf
- Description:
- ACCELEROMETER 240G PCM/SPI 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,041
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Product details
Overview
MMA5124KW from NXP Semiconductors (formerly Freescale) is a Z-axis PSI5-compatible inertial sensor designed for automotive airbag crash detection systems. It delivers ±240g full-scale range, 10-bit digital output with ±2% non-linearity, 400 Hz selectable 3-pole or 4-pole low-pass filtering, and operates across -40°C to +125°C per AEC-Q100 Grade 1 qualification.
For engineers reviewing the MMA5124KW datasheet, MMA5124KW pinout, MMA5124KW application, or MMA5124KW equivalent, this page provides verified technical context, PSI5 v1.3 interface timing, daisy-chain capability, internal oscillator frequency (4 MHz), and real-world crash-sensing design constraints including g-cell damping ratio (1.75) and sensing element natural frequency (13.6 kHz).
Technical Context
The MMA5124KW integrates an overdamped Z-axis MEMS g-cell with ΣΔ ADC, SINC filter, and programmable DSP-based signal chain. Its PSI5 v1.3 interface supports 125 kBaud or 190.5 kBaud data rates, 8- or 10-bit payload, even parity or 3-bit CRC error detection, and optional daisy-chain via BUS_SW-driven external low-side FET.
Internal regulation includes independent VREG (2.5 V ±75 mV) and VREGA (2.5 V ±75 mV) supplies, buffered by VBUF (3.8 V typical), with low-voltage detection thresholds at VCC_UV_F = 3.7 V and VREG_UV_F = 2.25 V. Offset cancellation uses dual-stage LPF with configurable cutoffs (0.1 Hz / 0.3 Hz / 0.04 Hz options).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Full-Scale Range | ±240g - defines maximum measurable acceleration before clipping; matches front/side crash pulse envelopes in automotive safety systems |
| PSI5 Compatibility | Version 1.3 compliant - ensures interoperability with PSI5 master controllers in automotive ECUs without protocol translation |
| Output Resolution | 10-bit digital - provides 480 LSB/g sensitivity and ±1 LSB offset after cancellation for high-precision crash discrimination |
| Operating Temperature | -40°C to +125°C - qualified per AEC-Q100 Grade 1 for under-hood and passenger compartment deployment |
| Internal Oscillator | 4 MHz ±5% - drives all timing-critical functions including interpolation, filter clocks, and PSI5 bit timing |
| LPF Configuration | Selectable 400 Hz 3-pole or 4-pole - enables noise suppression while preserving crash event rise-time fidelity |
| g-cell Damping Ratio | ζ = 1.75 - ensures overdamped response to prevent resonance-induced false triggers during high-frequency road vibration |
Pinout & Package
Pb-free 16-pin QFN package (Case 2086-01, 6 mm × 6 mm), thermally enhanced with exposed die attach pad internally connected to VSS.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | PSI5 Power & Data Line Supply | Connects to PSI5 bus via series resistor; powers device and carries modulated current response |
| IDATA | PSI5 Response Current Output | Modulates sink current onto VCC line for PSI5 communication; requires external pull-up |
| VBUF | Buffer Regulator Input | Supplies isolated 3.8 V rail to VREG/VREGA; decoupling capacitor mandatory for EMC immunity |
| VREG / VREGA | Digital / Analog Supply Outputs | Provide regulated 2.5 V ±75 mV for digital logic and analog signal chain; require dedicated 1 μF decoupling |
| BUS_SW | Daisy-Chain Gate Driver | Drives external N-channel FET gate to enable PSI5 daisy-chain topology with up to 3 devices |
| PCM | Test PCM Output | 4 MHz pulse-code modulated signal proportional to acceleration; enabled via OTP for production test only |
Key Features
| Feature | Design Value |
|---|---|
| PSI5 Daisy Chain Support | Enables multi-sensor networks on single two-wire bus using BUS_SW-controlled external FET, reducing wiring harness cost and ECU pin count |
| Programmable Time Slots | 0.5 μs resolution time slot assignment allows deterministic scheduling of up to 3 sensors on shared PSI5 bus without collision |
| Fast Startup HPF | Single-pole high-pass filter with rapid settling enables immediate crash detection post-power-on without long stabilization delays |
| Two-Wire Programming Mode | Allows field reconfiguration of PSI5 parameters (baud rate, data length, CRC) over same bus used for sensor data-no extra programming pins required |
| Self-Test Capability | Integrated electrostatic actuation verifies g-cell integrity and signal chain functionality during power-up or diagnostic cycles per ISO 26262 ASIL-B requirements |
Applications
| Front Airbag Crash Detection | Side Impact Sensor Module |
|---|---|
Use Scenario: Mounted behind vehicle grille to detect frontal collision events within 10–30 ms of impact onset. IC Role / Device Role / Timing Role: Z-axis accelerometer providing primary trigger signal to airbag control unit via PSI5 bus with <300 μs latency from sync pulse to valid data. Use Value: ±240g range and 13.6 kHz g-cell natural frequency capture high-slew crash pulses while rejecting engine vibration below 2.2 kHz. | Use Scenario: Integrated into door-mounted side-impact sensor assemblies to detect lateral intrusion during T-bone collisions. IC Role / Device Role / Timing Role: Overdamped Z-axis satellite sensor delivering synchronized PSI5 data to central airbag ECU in daisy-chain configuration with up to two other MMA51xxKW units. Use Value: BUS_SW-driven daisy chain reduces wiring complexity and enables precise time-slot-aligned sampling across multiple zones. |
| Rollover Detection System | Occupant Classification Interface |
Use Scenario: Mounted on vehicle roof rail to monitor vertical acceleration transients during potential rollover events. IC Role / Device Role / Timing Role: High-dynamic-range inertial sensor feeding real-time Z-axis data to rollover algorithm with 1 μs interpolation resolution. Use Value: 400 Hz programmable LPF suppresses suspension bounce noise while preserving critical rollover initiation signatures above 10 Hz. | Use Scenario: Embedded in seat-back structure to detect occupant presence, weight, and posture for adaptive airbag deployment logic. IC Role / Device Role / Timing Role: Low-noise Z-axis transducer supplying calibrated 10-bit acceleration data via PSI5 to occupant classification ECU. Use Value: ±1 LSB post-cancellation offset and 1.0 LSB RMS noise ensure reliable differentiation between adult, child, and empty seat states. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar inertial sensor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMA5112KW | ±120g full-scale range; identical PSI5 interface, pinout, and package | Lower range suitable for secondary crash sensors or less aggressive crash pulse environments | Select when system-level crash pulse analysis confirms peak acceleration remains below ±120g |
| MMA5148KW | ±480g full-scale range; same architecture, timing, and daisy-chain capability | Required for high-speed frontal impact or heavy-vehicle crash detection where >±240g pulses occur | Choose for commercial vehicle or high-performance automotive platforms with elevated crash severity requirements |
Compared with MMA5112KW and MMA5148KW, the MMA5124KW offers optimal balance of dynamic range and resolution for mainstream passenger car front/side airbag systems-neither over-spec'd nor under-ranged for typical NCAP-rated crash profiles.
Availability
MMA5124KW is available at Aetrix Electronics and suitable for automotive airbag control units, side-impact sensor modules, and rollover detection systems requiring stable component supply across extended product lifecycles.
Supply support for MMA5124KW 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 focused on secure connectivity solutions for automotive, industrial, and IoT applications.
The MMA51xxKW family was developed as part of NXP's Xtrinsic sensor portfolio to deliver AEC-Q100-qualified PSI5 inertial sensors optimized for automotive safety-critical crash detection with deterministic timing and functional safety compliance.
FAQ
What is the full-scale range and sensitivity of the MMA5124KW?
The MMA5124KW has a ±240g full-scale range with 4 LSB/g sensitivity in 10-bit mode. Its total sensitivity error is ±7% over temperature and supply voltage, and non-linearity is limited to ±2% across the full range. These values are factory-trimmed and stored in OTP, ensuring consistent performance without external calibration.
Does the MMA5124KW support daisy-chaining with other PSI5 sensors?
Yes, the MMA5124KW supports PSI5 daisy chaining via its BUS_SW pin, which drives an external N-channel MOSFET to switch VSS_OUT. When enabled, up to three MMA5124KW devices can share one PSI5 bus using programmable time slots with 0.5 μs resolution-eliminating need for separate wiring per sensor.
What are the key timing parameters for PSI5 communication on the MMA5124KW?
The MMA5124KW supports PSI5 baud rates of 125 kBaud (8.0 μs/bit) or 190.5 kBaud (5.25 μs/bit). Sync pulse period is programmable, and initialization phases (Phase 2/3) scale with fOSC (4 MHz). Data interpolation latency is 65/fOSC ≈ 16.25 ns, and daisy-chain activation delay is ≤300 μs after "SetAdr" response.
How does the MMA5124KW handle power supply variations and brown-out conditions?
The MMA5124KW features independent low-voltage detection on VCC (3.7 V threshold), VBUF (3.15 V), VREG (2.25 V), and VREGA (2.25 V), each with 100 mV hysteresis. Internal regulators maintain stable 2.5 V outputs despite VCC fluctuations from 4.2 V to 17.0 V, enabling robust operation in noisy automotive electrical environments.
Can the MMA5124KW be programmed in-system, and what parameters are user-configurable?
Yes, the MMA5124KW supports two-wire PSI5 programming mode. Users can configure baud rate, data length (8/10-bit), error detection (parity/CRC), time slots, LPF order (3/4-pole), and HPF cutoff (0.04/0.1/0.3 Hz) via OTP. The LOCK_U bit permanently secures settings after final programming to prevent accidental overwrite.
MMA5124KW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- MMA
- Package/Case:
- 16-QFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Not For New Designs
- 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)
MMA5124KW FAQ
1.How can I place an order for MMA5124KW through Aetrix?
Please submit a Request for Quotation (RFQ) for MMA5124KW 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 MMA5124KW reliable?
The price and inventory of MMA5124KW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMA5124KW is usually 5 days.
3.What payment methods are accepted for MMA5124KW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMA5124KW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMA5124KW?
MMA5124KW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMA5124KW 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 MMA5124KW?
For technical support, including MMA5124KW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMA5124KW requirements.
6.How does Aetrix verify that MMA5124KW is sourced from the original manufacturer or authorized distributors?
All MMA5124KW 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 MMA5124KW meets industry standards.
7.What is the process for return or replacement of MMA5124KW?
All MMA5124KW units undergo pre-shipment inspection (PSI). If there is an issue with MMA5124KW, 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 MMA5124KW part is unused and in its original packaging.
Return procedure for MMA5124KW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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