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NXP Semiconductors MMA2702W
- Part No.:
- MMA2702W
- Manufacturer:
- NXP Semiconductors
- Category:
- Accelerometers
- Package:
- 16-QFN Exposed Pad
- Datasheet:
-
MMA2702W.pdf
- Description:
- ACCELEROMETER 25G PCM/SPI 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,793
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Product details
Overview
MMA2702W from NXP Semiconductors (formerly Freescale) is an X-axis ±25 g overdamped satellite accelerometer with DSI3 interface, designed for automotive safety-critical inertial sensing in airbag control units and rollover detection systems. It delivers 20.48 LSB/g sensitivity, 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.
For engineers reviewing the MMA2702W datasheet, MMA2702W pinout, MMA2702W application, or MMA2702W equivalent, key selection criteria include DSI3 Discovery Mode physical addressing, high-side daisy-chain bus switch capability, background diagnostic support during periodic data collection, and AEC-Q100 Grade 0 qualification for under-hood deployment.
Technical Context
The MMA2702W implements a sigma-delta ADC with sinc filter, followed by programmable digital signal processing including configurable IIR high-pass and six selectable FIR low-pass filters. Its DSI3 physical layer supports three operational modes: Discovery Mode (for network topology identification), Command and Response Mode (for register configuration), and Periodic Data Collection Mode (with integrated Background Diagnostic Mode).
Internally regulated supplies (VREG, VREGA, VBUF) provide EMC immunity and supply dropout resilience. The device features fast-startup offset cancellation with dual-phase startup timing, self-test activation/deactivation times as low as 0.4 ms (at 1200 Hz LPF), and transducer clipping limits of ±500 g for the ±25 g range - enabling robust overload handling in crash event detection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Full-scale range | ±25 g - calibrated for X-axis acceleration measurement in crash pulse detection and vehicle dynamics monitoring |
| Sensitivity | 20.48 LSB/g - enables 10-bit resolution with ±0.05 g effective resolution at nominal range |
| Internal sample rate | 16 μs (62.5 kHz) - interpolated to 1 μs output timing for precise event timestamping |
| Low-pass filter options | 180 Hz to 1200 Hz - six user-selectable cutoffs to match mechanical resonance and noise profiles |
| Operating temperature | -40°C to +125°C - qualified for engine compartment and airbag control module mounting |
| DSI3 compliance | Revision 1.0 - supports daisy-chained networks with physical location discovery and diagnostics |
| AEC-Q100 grade | Grade 0 - validated for automotive applications requiring operation up to +150°C junction temperature |
Pinout & Package
16-pin QFN package (6 mm × 6 mm × 2 mm, case 2086-01), Pb-free, with exposed die attach pad internally connected to VSS.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BUS_O | Supply out | Drives next slave's BUS_I via internal sense resistor; requires external capacitor to VSS for stability |
| BUS_I | Supply and communication input | Primary DSI3 power and bidirectional command/data line; requires external capacitor to BUSRTN |
| BUSRTN | Supply return | DSI3 supply return node; must be connected to system ground reference |
| BUSSW | Bus switch gate drive | Drives external p-channel FET gate for high-side daisy-chain switching; requires external pullup |
| VBUF | Buffer regulator supply | Provides EMC-immune internal regulation; requires 1 μF ceramic capacitor to VSS |
| VREG / VREGA | Internal circuitry supplies | Dual regulated rails for analog/digital domains; each requires dedicated 1 μF decoupling to VSS/VSSA |
| VSS | Internal supply return | Common return for all internal regulators; must connect to BUSRTN |
| PCM | Pulse code modulated output | 4 MHz test output proportional to acceleration; unused pins must be left unconnected |
Key Features
| Feature | Design Value |
|---|---|
| DSI3 Discovery Mode | Enables automatic physical location identification in multi-node daisy-chained networks without manual address programming |
| Background Diagnostic Mode | Performs real-time health checks (offset monitor, self-test readiness) concurrently with periodic acceleration data streaming |
| Overdamped g-cell | ζ = 2.76 for ±25 g X-axis range - eliminates ringing in high-slew crash events and ensures monotonic step response |
| Fast-offset cancellation | Dual-phase startup (80 ms Phase 1 + 70 ms Phase 2) achieves stable zero-g output within 150 ms after power-on |
| Transducer clipping limit | ±500 g - exceeds ISO 26262 ASIL-B requirements for airbag sensor survivability during severe collisions |
Applications
| Frontal Crash Detection | Rollover Sensing |
|---|---|
Use Scenario: Real-time longitudinal acceleration monitoring during frontal impact to trigger airbag deployment within 15 ms of crash onset. IC Role / Device Role / Timing Role: Primary X-axis inertial sensor providing time-stamped, interpolated 1 μs resolution acceleration data to airbag control unit MCU. Use Value: 16 μs internal sampling with interpolation ensures sub-millisecond timing accuracy for ASIL-B compliant crash decision logic. | Use Scenario: Continuous angular rate and lateral acceleration fusion in electronic stability control (ESC) modules to detect vehicle roll angle exceeding threshold. IC Role / Device Role / Timing Role: Satellite accelerometer feeding X-axis data into Kalman filter alongside gyroscope inputs for roll estimation. Use Value: Six selectable LPF configurations allow tuning to suppress road noise while preserving transient roll dynamics. |
| Side-Impact Occupant Detection | Seatbelt Pretensioner Activation |
Use Scenario: Detecting side-impact acceleration pulses to determine occupant presence and position for adaptive airbag inflation control. IC Role / Device Role / Timing Role: Secondary X-axis sensor mounted in B-pillar or door module, communicating via DSI3 daisy chain to central safety ECU. Use Value: DSI3 Discovery Mode enables automatic node enumeration without pre-assigned addresses-reducing wiring harness complexity. | Use Scenario: Triggering seatbelt pretensioners within 8 ms of crash initiation based on early acceleration rise detection. IC Role / Device Role / Timing Role: High-reliability inertial sensor with AEC-Q100 Grade 0 qualification delivering fault-free operation at 125°C ambient. Use Value: Overdamped mechanical design (ζ = 2.76) prevents resonance-induced false triggers during high-frequency road vibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar inertial sensing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMA2712W | ±125 g full-scale range, 4.096 LSB/g sensitivity, identical DSI3 interface and package | Targeted at rollover detection and ESC where higher dynamic range is required for sustained lateral acceleration | Select when system-level acceleration envelope exceeds ±25 g but same DSI3 network integration is needed |
| ADXL313 | I²C/SPI interface, ±0.5 g to ±16 g range, 13-bit resolution, no DSI3 or daisy-chain capability | Designed for non-automotive industrial motion sensing; lacks AEC-Q100 qualification and crash survivability specs | Choose only for cost-sensitive consumer or industrial applications where DSI3 networking and ASIL compliance are not required |
Compared with MMA2712W and ADXL313, the MMA2702W uniquely combines ±25 g range optimized for crash pulse fidelity, DSI3 daisy-chain topology support, and AEC-Q100 Grade 0 qualification-making it irreplaceable in ASIL-B airbag control architectures requiring deterministic timing and network scalability.
Availability
MMA2702W is available at Aetrix Electronics and suitable for automotive safety systems, airbag control units, and rollover detection modules requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant traceability.
Supply support for MMA2702W 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, with leadership in automotive MCUs, radar, and inertial sensors.
The MMA27XXW product line was developed specifically for ASIL-B automotive safety applications requiring daisy-chainable, DSI3-compliant inertial sensors with built-in diagnostics and crash survivability-targeting airbag control, rollover detection, and electronic stability control systems.
FAQ
What is the primary sensing axis and full-scale range of the MMA2702W?
The MMA2702W is an X-axis single-axis accelerometer with a nominal full-scale range of ±25 g. This range is optimized for high-fidelity capture of crash pulse waveforms in automotive airbag control applications, with transducer clipping limits extending to ±500 g to ensure survivability during severe impacts. Its sensitivity is 20.48 LSB/g in 10-bit mode.
Does the MMA2702W support daisy-chain configuration, and how is it implemented?
Yes, the MMA2702W supports daisy-chain configuration via its DSI3 interface. It uses the BUSSW pin to drive an external p-channel FET gate, enabling high-side switching between BUS_I and BUS_O. The BUS_O pin supplies power and signal to the next slave in the chain, and Discovery Mode allows automatic physical location identification without manual address assignment-critical for scalable multi-sensor safety networks.
What are the key timing specifications for crash event detection using the MMA2702W?
The MMA2702W provides 16 μs internal sampling (62.5 kHz), interpolated to 1 μs output timing for precise event timestamping. Self-test activation time is as low as 0.4 ms at 1200 Hz LPF, and offset cancellation stabilizes within 150 ms. Combined with DSI3's sub-microsecond command latency, this enables <15 ms end-to-end crash decision latency-meeting ASIL-B timing requirements for airbag deployment.
How does the MMA2702W handle electromagnetic interference in automotive environments?
The MMA2702W mitigates EMI through multiple design features: VBUF pin supplies a dedicated buffer regulator for internal circuitry, providing immunity from supply dropouts and EMC transients; external 1 μF capacitors are required on VBUF, VREG, and VREGA; and the DSI3 bus includes integrated EMC/ESD protection components (e.g., C1/C5/C6 in application diagram). It meets AEC-Q100 ESD requirements (±4 kV HBM on BUS_I/BUS_O/BUSRTN).
Is the MMA2702W qualified for under-hood automotive applications?
Yes, the MMA2702W is AEC-Q100 qualified to Grade 0, supporting operation from -40°C to +125°C ambient and junction temperatures up to +150°C. Its 16-pin QFN package (case 2086-01) is Pb-free and designed for reflow compatibility. The device's overdamped g-cell (damping ratio ζ = 2.76) and ±2000 g powered/unpowered shock rating make it suitable for engine compartment and airbag control module mounting locations.
MMA2702W 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:
- ±25g
- Sensitivity (LSB/g):
- 20.48
- 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-EP (6x6)
MMA2702W FAQ
1.How can I place an order for MMA2702W through Aetrix?
Please submit a Request for Quotation (RFQ) for MMA2702W 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 MMA2702W reliable?
The price and inventory of MMA2702W are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMA2702W is usually 5 days.
3.What payment methods are accepted for MMA2702W?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMA2702W transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMA2702W?
MMA2702W orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMA2702W 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 MMA2702W?
For technical support, including MMA2702W datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMA2702W requirements.
6.How does Aetrix verify that MMA2702W is sourced from the original manufacturer or authorized distributors?
All MMA2702W 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 MMA2702W meets industry standards.
7.What is the process for return or replacement of MMA2702W?
All MMA2702W units undergo pre-shipment inspection (PSI). If there is an issue with MMA2702W, 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 MMA2702W part is unused and in its original packaging.
Return procedure for MMA2702W:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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