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NXP Semiconductors MMA2718W
- Part No.:
- MMA2718W
- Manufacturer:
- NXP Semiconductors
- Category:
- Accelerometers
- Package:
- 16-QFN Exposed Pad
- Datasheet:
-
MMA2718W.pdf
- Description:
- ACCELEROMETER 187G PCM/SPI 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,102
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Product details
Overview
MMA2718W from NXP (formerly Freescale) is an X-axis ±187 g DSI3-compatible inertial sensor designed for automotive and industrial safety-critical applications. It features a 16-pin QFN package, 16 μs internal sample rate with 1 μs interpolation, six selectable low-pass filters (180–1200 Hz), and operates across –40°C to +125°C. Used in airbag deployment systems where precise high-g acceleration detection and daisy-chain bus topology are required.
For engineers reviewing the MMA2718W datasheet, MMA2718W pinout, MMA2718W application, or MMA2718W equivalent, key selection criteria include DSI3 Discovery Mode support for physical location identification, high-side bus switch output driver capability, Command and Response Mode configuration, Periodic Data Collection Mode timing resolution (down to 1 μs), and AEC-Q100 Grade 0 qualification for automotive use.
Technical Context
The MMA2718W implements a sigma-delta (ΣΔ) converter with sinc filter compensation and digital signal processing (DSP) including configurable IIR high-pass and selectable FIR low-pass filtering. Its DSI3 physical layer supports three operational modes: Discovery Mode for network enumeration, Command and Response Mode for register access, and Periodic Data Collection Mode with Background Diagnostic Mode enabled during data transfer.
Internally regulated supplies (VREG, VREGA, VBUF) provide EMC immunity and supply dropout resilience. The device integrates a self-test mechanism with calibrated response (±10% accuracy over temperature), overload detection up to ±2000 g, and fast-startup offset cancellation with dual-phase startup timing (80 ms Phase 1, 70 ms Phase 2).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Full-scale range | ±187 g - Enables detection of severe crash events without clipping in front-impact airbag algorithms. |
| Output resolution | 10-bit signed - Provides 1024 discrete levels for acceleration quantization with ±511 LSB range. |
| Sensitivity | 2.5944 LSB/g (typ.) - Maps raw output to physical acceleration with known gain for calibration traceability. |
| Low-pass filter options | 180 Hz to 1200 Hz (6 settings) - Allows noise suppression tuning for specific vehicle dynamics bandwidths. |
| Sample rate | 16 μs internal, interpolated to 1 μs - Supports sub-microsecond timestamping for precise event sequencing in safety-critical systems. |
| Operating temperature | –40°C to +125°C - Meets AEC-Q100 Grade 0 requirements for under-hood and passenger compartment mounting. |
| DSI3 compliance | Revision 1.0 standard - Ensures interoperability with DSI3 master controllers in automotive networks. |
Pinout & Package
Packaged in Pb-Free 16-pin QFN (6 mm × 6 mm × 2 mm, case 2086-01), the MMA2718W uses a daisy-chain–optimized pinout with dedicated BUS_I/BUS_O lines, high-side bus switch drive (BUSSW), and isolated analog/digital supply pins (VREG, VREGA, VBUF) for noise separation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BUS_O | Supply out | Drives next slave's BUS_I via internal sense resistor; requires external decoupling to VSS for EMC stability. |
| BUS_I | Supply and communication input | Primary DSI3 bus connection carrying power and bidirectional command/data; needs local 1 μF capacitor to BUSRTN. |
| BUSSW | Bus switch gate drive | Controls external p-channel FET for daisy-chain mode; requires external pullup resistor per Section 3.6.4. |
| VBUF | Buffer regulator supply | Feeds internal regulators for EMC immunity; must be decoupled with 1 μF ceramic capacitor to VSS. |
| VREG / VREGA | Internal circuitry supplies | Dual regulated rails (2.5 V typ.) for analog/digital domains; each requires dedicated 1 μF decoupling to VSS/VSSA. |
| PCM | Pulse code modulated output | 4 MHz test output proportional to acceleration; left unconnected if unused per datasheet guidance. |
| TEST_* pins | SPI test interface | Reserved for factory test only; must be grounded or left floating in production (TEST, TEST2, TEST_SCLK, etc.). |
Key Features
| Feature | Design Value |
|---|---|
| DSI3 Discovery Mode | Enables automatic physical location identification on multi-node bus, eliminating manual address configuration in vehicle ECU networks. |
| Periodic Data Collection Mode | Delivers synchronized acceleration samples at user-defined intervals (resolution down to 1 μs), enabling deterministic timing for crash event reconstruction. |
| Background Diagnostic Mode | Performs real-time health checks (offset drift, supply integrity) during active data collection-no interruption to safety-critical sampling. |
| Overdamped sensing element | ζ = 1.26–2.00 (X-axis) ensures minimal resonance amplification at package frequency (100 kHz), critical for accurate high-g transient measurement. |
| AEC-Q100 qualified | Grade 0 certification confirms reliability for automotive applications operating at junction temperatures up to +150°C. |
Applications
| Frontal Crash Detection | Side-Impact Occupant Sensing |
|---|---|
Use Scenario: Detects rapid deceleration during head-on collisions to trigger airbag inflation within <15 ms. IC Role / Device Role / Timing Role: Primary X-axis acceleration transducer providing time-stamped 10-bit data via DSI3 Periodic Data Collection Mode. Use Value: ±187 g full-scale range avoids clipping during severe crashes; 1 μs interpolation enables precise event timing alignment with other ECUs. | Use Scenario: Monitors lateral acceleration during side collisions to determine occupant position and seatbelt status. IC Role / Device Role / Timing Role: Satellite accelerometer mounted in B-pillar or door module, communicating via DSI3 daisy-chain topology. Use Value: High-side bus switch (BUSSW) enables compact multi-sensor wiring; –40°C to +125°C operation ensures reliability in door cavity environments. |
| Roll-Over Event Monitoring | Electronic Stability Control (ESC) Feedback |
Use Scenario: Detects angular acceleration and sustained lateral G-forces indicating vehicle rollover risk. IC Role / Device Role / Timing Role: Secondary inertial node in roof rail or center console, configured in DSI3 Command and Response Mode for dynamic parameter updates. Use Value: Six LPF options allow bandwidth optimization for slow-roll vs. fast-flip detection; self-test function validates sensor integrity before each ignition cycle. | Use Scenario: Provides real-time X-axis acceleration feedback to ESC controller during aggressive cornering or evasive maneuvers. IC Role / Device Role / Timing Role: Integrated into ESC module as dedicated longitudinal acceleration reference, synchronized via DSI3 bus timing. Use Value: Low-noise performance (±1.0 LSB RMS @ 180 Hz LPF) ensures clean signal for closed-loop control; AEC-Q100 qualification guarantees functional safety compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar inertial sensor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMA2725W | ±250 g full-scale range; higher clipping limit (2300 g) but lower sensitivity (1.9456 LSB/g). | Preferred for applications requiring extended overload margin (e.g., heavy-duty truck crash detection) where reduced resolution is acceptable. | Select MMA2725W when system-level crash pulse analysis demands >±187 g headroom without ADC saturation. |
| MMA2712W | ±125 g full-scale range; higher sensitivity (4.0960 LSB/g) and lower noise floor (±0.75 LSB RMS @ 180 Hz LPF). | Better suited for low-g precision applications (e.g., pedestrian impact detection) where fine-grained acceleration discrimination is prioritized. | Choose MMA2712W when algorithmic thresholds rely on sub-1g resolution and noise-limited detection dominates design constraints. |
Compared with MMA2718W, MMA2725W trades resolution for wider dynamic range while MMA2712W enhances sensitivity at the cost of reduced overload tolerance-selection depends on whether crash pulse amplitude distribution or signal-to-noise ratio governs the safety algorithm's false-trigger rate.
Availability
MMA2718W is available at Aetrix Electronics and suitable for automotive airbag control units, electronic stability control modules, and rollover detection systems requiring stable component supply across long production lifecycles.
Supply support for MMA2718W 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 markets, with deep expertise in sensor signal conditioning and functional safety.
The MMA27XXW product line delivers AEC-Q100–qualified DSI3 inertial sensors targeting automotive safety systems-including airbag control, rollover detection, and ESC-where deterministic timing, daisy-chain scalability, and high-g survivability are mandatory.
FAQ
What is the primary interface protocol supported by the MMA2718W?
The MMA2718W exclusively supports the DSI3 (Digital Sensor Interface 3) protocol per Revision 1.0 standard. It does not implement SPI, I²C, or analog output interfaces. All communication-including device configuration, data readout, and diagnostics-occurs over the DSI3 bus using BUS_I and BUS_O pins with defined command/response and periodic collection modes as specified in the MMA27XXW datasheet Rev. 0.5.
Does the MMA2718W require external passive components for basic operation?
Yes, the MMA2718W requires external capacitors on VBUF, VREG, and VREGA pins (1 μF each, X7R ceramic), plus a 220 pF capacitor on BUSIN and two 100 pF capacitors on BUSOUT for EMC/ESD protection. An external p-channel MOSFET and 100 kΩ pullup resistor are needed only if daisy-chain mode (via BUSSW) is implemented. These values are specified in Table 2 of the MMA27XXW datasheet.
How does the MMA2718W handle offset drift over temperature and time?
The MMA2718W performs automatic offset cancellation using a dual-phase IIR high-pass filter with programmable startup timing (80 ms Phase 1, 70 ms Phase 2). Post-compensation digital offset remains within ±1 LSB across –40°C to +125°C. Continuous offset monitoring compares raw output against stored limits (±70 LSB for ±187 g range) and triggers diagnostic flags if exceeded-enabling real-time health assessment without interrupting data collection.
Can the MMA2718W be used in non-automotive applications such as industrial machinery monitoring?
Yes, the MMA2718W is qualified for industrial use due to its –40°C to +125°C operating range, ±2000 g powered/unpowered shock rating, and robust EMC design (VBUF-regulated supplies, daisy-chain isolation). Its DSI3 interface is compatible with industrial masters supporting the standard, and its high-g range suits vibration monitoring in hydraulic systems, rotating equipment, or structural impact testing where deterministic timing and overload resilience are critical.
What is the maximum number of MMA2718W devices that can be connected on a single DSI3 bus?
The MMA2718W supports up to 16 devices on a single DSI3 network, as defined by the DSI3 Standard Revision 1.0 and confirmed in Section 4.4 of the MMA27XXW datasheet. This limit arises from the 4-bit address space used in Discovery Mode and Command and Response Mode addressing. Each device must have a unique physical position in the daisy chain to ensure reliable enumeration and command routing.
MMA2718W 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:
- X
- Acceleration Range:
- ±187g
- Sensitivity (LSB/g):
- 2.731
- Sensitivity (mV/g):
- -
- Bandwidth:
- -
- Output Type:
- PCM, SPI
- Voltage - Supply:
- 4V ~ 20V
- Features:
- Selectable Low Pass Filter
- Operating Temperature:
- -40°C ~ 105°C
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QFN (6x6)
MMA2718W FAQ
1.How can I place an order for MMA2718W through Aetrix?
Please submit a Request for Quotation (RFQ) for MMA2718W 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 MMA2718W reliable?
The price and inventory of MMA2718W are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMA2718W is usually 5 days.
3.What payment methods are accepted for MMA2718W?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMA2718W transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMA2718W?
MMA2718W orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMA2718W 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 MMA2718W?
For technical support, including MMA2718W datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMA2718W requirements.
6.How does Aetrix verify that MMA2718W is sourced from the original manufacturer or authorized distributors?
All MMA2718W 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 MMA2718W meets industry standards.
7.What is the process for return or replacement of MMA2718W?
All MMA2718W units undergo pre-shipment inspection (PSI). If there is an issue with MMA2718W, 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 MMA2718W part is unused and in its original packaging.
Return procedure for MMA2718W:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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