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NXP Semiconductors MMA2712W
- Part No.:
- MMA2712W
- Manufacturer:
- NXP Semiconductors
- Category:
- Accelerometers
- Package:
- 16-QFN Exposed Pad
- Datasheet:
-
MMA2712W.pdf
- Description:
- ACCELEROMETER 125G PCM/SPI 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,318
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Product details
Overview
MMA2712W from NXP Semiconductors (formerly Freescale) is an X-axis, ±125 g DSI3-compatible inertial sensor designed for automotive and industrial safety-critical applications. It delivers 4.096 LSB/g sensitivity, operates from −40°C to +125°C, features six selectable low-pass filters (180–1200 Hz), and supports Discovery Mode, Command/Response Mode, and Periodic Data Collection Mode over a single-wire DSI3 bus.
For engineers reviewing the MMA2712W datasheet, MMA2712W pinout, MMA2712W application, or MMA2712W equivalent, this page provides verified technical context, validated pin functions, confirmed DSI3 timing behavior, real-world use cases in airbag control and chassis stability systems, and two manufacturer-validated alternative part numbers with documented functional and interface differences.
Technical Context
The MMA2712W implements a damped MEMS g-cell with 3952 Hz rolloff and 26 kHz natural frequency for X-axis ±125 g range, paired with a ΣΔ ADC, sinc filter, and digital signal processor supporting interpolation to 1 μs resolution. Its internal architecture includes dual voltage regulators (VREG/VREGA at 2.5 V nominal), buffer regulator (VBUF), and high-side bus switch driver (BUSSW) for daisy-chain topology.
DSI3 physical layer compliance enables robust communication via current-mode signaling: Discovery Mode uses ICCQ sensing for physical location identification; Command and Response Mode supports register configuration; Periodic Data Collection Mode delivers acceleration data with background diagnostics active. All modes operate within AEC-Q100 Grade 0 qualification limits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Full-scale range | ±125 g X-axis - defines maximum measurable acceleration before clipping at 1700 g (transducer) and 920 g (ADC) |
| Sensitivity | 4.096 LSB/g - enables 10-bit output resolution of ~30.5 mg/LSB for precise low-g event detection |
| Operating temperature | −40°C to +125°C - meets AEC-Q100 Grade 0 requirements for under-hood and safety-critical placement |
| DSI3 interface | Single-wire, current-mode bus - eliminates need for separate clock/data lines and reduces EMI susceptibility |
| Low-pass filter options | 180 Hz to 1200 Hz (6 settings) - allows dynamic bandwidth selection to suppress noise while preserving response time |
| Internal sample rate | 16 μs (62.5 kHz) with interpolation to 1 μs - supports high-fidelity capture of transient crash events |
| Package | 16-pin QFN, 6 mm × 6 mm × 2 mm (Case 2086-01) - surface-mount footprint compatible with automotive reflow profiles |
Pinout & Package
16-pin QFN package (Case 2086-01), 6 mm × 6 mm × 2 mm, Pb-free, with exposed die attach pad connected internally to VSS.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BUS_O | Supply out | Provides regulated power to next device in daisy chain; requires external capacitor to VSS |
| BUS_I | Supply and communication input | Primary DSI3 bus connection for power and bidirectional current-mode signaling |
| BUSRTN | Supply return | DSI3 supply return node; must be connected to system ground plane |
| BUSSW | Bus switch gate drive | Drives external p-channel FET for daisy-chain enable; requires external pullup resistor |
| VBUF | Buffer regulator supply | Feeds internal regulators for EMC immunity; requires 1 μF decoupling capacitor to VSS |
| VREG / VREGA | Internal circuitry supplies | Dual 2.5 V regulators for analog/digital domains; each requires dedicated 1 μF capacitor |
| VSS | Internal supply return | Common return for all internal supplies; must connect to BUSRTN |
| PCM | Pulse code modulated output | 4 MHz test signal proportional to acceleration; unused pins must be left floating |
| TEST_* pins | SPI test interface | Reserved for factory test only; must be grounded or left unconnected in application |
Key Features
| Feature | Design Value |
|---|---|
| DSI3 Discovery Mode | Enables automatic physical location identification on multi-node bus without manual address programming |
| Background Diagnostic Mode | Runs self-test and offset monitoring concurrently with periodic data collection-no interruption to safety-critical sampling |
| Overdamped MEMS element | ζ = 1.26 for ±125 g X-axis ensures minimal resonance amplification during high-frequency vibration |
| Fast-start IIR high-pass filter | Compensates for tilt-induced DC drift in <70 ms while limiting output rate to prevent saturation |
| AEC-Q100 qualified | Validated for automotive Grade 0 operation (−40°C to +125°C ambient) with full reliability stress testing |
Applications
| Frontal Crash Detection | Side-Impact Sensing |
|---|---|
Use Scenario: Detects rapid deceleration during head-on collisions to trigger airbag deployment within ≤30 ms. IC Role / Device Role / Timing Role: Primary X-axis acceleration transducer feeding safety controller via deterministic DSI3 timing. Use Value: 16 μs internal sample rate and 1 μs interpolation enable sub-millisecond latency for critical decision windows. | Use Scenario: Mounted on B-pillar or door to sense lateral acceleration during T-bone impacts. IC Role / Device Role / Timing Role: Satellite accelerometer in daisy-chained DSI3 network, reducing wiring harness complexity. Use Value: BUSSW-driven high-side switch allows seamless integration into multi-node bus without additional level shifters. |
| Electronic Stability Control (ESC) | Roll-Over Detection |
Use Scenario: Monitors longitudinal acceleration during aggressive braking or acceleration to assist yaw-rate correction. IC Role / Device Role / Timing Role: X-axis inertial reference for vehicle dynamics ECU with synchronized DSI3 data streaming. Use Value: Six programmable LPF options let ESC firmware adapt bandwidth to road conditions (e.g., 180 Hz for rough terrain). | Use Scenario: Detects sustained lateral acceleration exceeding threshold to warn of imminent roll-over in SUVs or trucks. IC Role / Device Role / Timing Role: Safety-redundant X-axis sensor operating in Periodic Data Collection Mode with Background Diagnostics. Use Value: Self-test accuracy ±10% across −40°C to +125°C ensures reliable fault detection in extreme thermal environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar inertial sensor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMA2712WR2 | Identical electrical and mechanical specifications; differs only in tape-and-reel packaging (vs. rail for MMA2712W) | No functional difference; selected when automated SMT placement is required | Direct form-fit-function replacement; no design change needed beyond packaging logistics |
| MMA2702W | Same DSI3 interface and package, but ±25 g full-scale range and higher 20.48 LSB/g sensitivity | Optimized for low-g precision (e.g., inclinometer, tilt sensing); insufficient for crash pulse detection | Select when application requires <±50 g measurement range and higher resolution at lower acceleration levels |
Compared with MMA2712W, MMA2712WR2 offers identical performance in tape-and-reel format for volume SMT assembly, while MMA2702W trades range for sensitivity-making it suitable for non-safety-critical low-g monitoring but unsuitable for crash event capture where ±125 g headroom is mandatory.
Availability
MMA2712W is available at Aetrix Electronics and suitable for automotive airbag control units, electronic stability control modules, and industrial machinery safety shutdown systems requiring stable component supply across extended product lifecycles.
Supply support for MMA2712W 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 fusion and functional safety.
The MMA27XXW family was engineered specifically for ASIL-B compliant automotive safety systems, delivering DSI3-based inertial sensing with integrated diagnostics, daisy-chain capability, and AEC-Q100 Grade 0 qualification.
FAQ
What is the full-scale range and sensitivity of the MMA2712W?
The MMA2712W has a full-scale range of ±125 g on the X-axis and a nominal sensitivity of 4.096 LSB/g in 10-bit mode. This yields a resolution of approximately 30.5 mg per LSB, enabling accurate detection of both low-level vibrations and high-magnitude crash events. Sensitivity remains stable across its −40°C to +125°C operating range, with ±7% variation over temperature and supply voltage.
How does the DSI3 interface of the MMA2712W differ from standard SPI or I²C?
The MMA2712W uses DSI3 (Distributed System Interface 3), a single-wire, current-mode protocol that combines power delivery and bidirectional communication on BUS_I. Unlike SPI or I²C, DSI3 eliminates separate clock lines, reduces EMI, and supports daisy-chaining up to 32 devices. It includes Discovery Mode for automatic node identification and Background Diagnostic Mode that runs concurrently with data collection-features not available in conventional serial interfaces.
Can the MMA2712W be used in a daisy-chain configuration, and what external components are required?
Yes, the MMA2712W supports daisy-chain operation using its BUSSW pin to drive an external p-channel MOSFET that connects BUS_I to BUS_O of the next device. Required external components include a 100 kΩ pullup resistor on BUSSW, a high-side FET (e.g., PMV20XN), and decoupling capacitors: 1 μF on VREG, VREGA, and VBUF (each to VSS), plus 220 pF on BUS_I and 100 pF on BUS_O for EMC protection.
What diagnostic capabilities does the MMA2712W provide, and how are they activated?
The MMA2712W provides continuous offset monitoring, self-test execution, and background diagnostics during Periodic Data Collection Mode. Offset monitoring updates every 500 ms and flags deviations >±120 LSB. Self-test is triggered via DSI3 command and produces a known acceleration output (236–395 LSB for ±125 g range). Background diagnostics run automatically without interrupting data streaming-activated by enabling BDM in the configuration register.
Is the MMA2712W qualified for automotive safety applications, and what standards does it meet?
Yes, the MMA2712W is AEC-Q100 qualified for Grade 0 (−40°C to +125°C ambient) and designed for ASIL-B automotive safety applications. It complies with DSI3 Standard Revision 1.0 and includes SafeAssure features such as built-in self-test, continuous offset monitoring, and hardware-level fault detection. Its overdamped MEMS structure, dual voltage regulators, and diagnostic coverage make it suitable for airbag control, ESC, and rollover detection systems.
MMA2712W 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:
- ±125g
- Sensitivity (LSB/g):
- 4.096
- 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)
MMA2712W FAQ
1.How can I place an order for MMA2712W through Aetrix?
Please submit a Request for Quotation (RFQ) for MMA2712W 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 MMA2712W reliable?
The price and inventory of MMA2712W are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMA2712W is usually 5 days.
3.What payment methods are accepted for MMA2712W?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMA2712W transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMA2712W?
MMA2712W orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMA2712W 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 MMA2712W?
For technical support, including MMA2712W datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMA2712W requirements.
6.How does Aetrix verify that MMA2712W is sourced from the original manufacturer or authorized distributors?
All MMA2712W 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 MMA2712W meets industry standards.
7.What is the process for return or replacement of MMA2712W?
All MMA2712W units undergo pre-shipment inspection (PSI). If there is an issue with MMA2712W, 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 MMA2712W part is unused and in its original packaging.
Return procedure for MMA2712W:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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