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NXP Semiconductors MMA2737W
- Part No.:
- MMA2737W
- Manufacturer:
- NXP Semiconductors
- Category:
- Accelerometers
- Package:
- 16-QFN Exposed Pad
- Datasheet:
-
MMA2737W.pdf
- Description:
- ACCELEROMETER 375G PCM/SPI 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,788
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Product details
Overview
MMA2737W from NXP Semiconductors (formerly Freescale) is a DSI3-compatible, overdamped X-axis satellite accelerometer with ±375 g full-scale range, 16 μs internal sample rate interpolated to 1 μs resolution, and six selectable low-pass filter options up to 1200 Hz. It operates across -40°C to +125°C and meets AEC-Q100 Grade 0 for automotive safety-critical applications such as airbag deployment sensing and rollover detection.
For engineers reviewing the MMA2737W datasheet, MMA2737W pinout, MMA2737W application, or MMA2737W equivalent, key selection criteria include its DSI3 Discovery Mode for physical location identification, high-side bus switch output driver for daisy-chain topology, Command and Response Mode for device configuration, and Periodic Data Collection Mode with integrated Background Diagnostic Mode - all critical for fault-tolerant vehicle inertial networks.
Technical Context
The MMA2737W implements a sigma-delta (ΣΔ) converter with sinc filtering, followed by digital signal processing including configurable IIR high-pass and six selectable FIR low-pass filters (180–1200 Hz). Its DSI3 physical layer supports three operational modes: Discovery Mode for node enumeration, Command and Response Mode for register access, and Periodic Data Collection Mode with concurrent diagnostics.
Internally, it integrates dual voltage regulators (VREG/VREGA at 2.5 V nominal), a buffer regulator (VBUF), and a self-test actuator with verified response times ranging from 0.4 ms (1200 Hz LPF) to 4.0 ms (180 Hz LPF). The sensor element features overdamped mechanical design (damping ratio ζ = 1.26–3.60) and natural frequencies from 12.6 kHz to 28.7 kHz depending on range configuration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Full-scale range | ±375 g - enables detection of extreme crash events and high-g rollover dynamics without clipping |
| DSI3 interface | Compliant with DSI3 Standard Rev. 1.0 - supports daisy-chained topology with Discovery Mode and background diagnostics |
| Operating temperature | -40°C to +125°C - qualified per AEC-Q100 Rev. G for under-hood and safety-critical automotive placement |
| Internal sample rate | 16 μs (62.5 kSPS) with 1 μs interpolation - provides precise timing alignment for multi-node synchronization |
| Low-pass filter options | Six selectable cutoffs: 180 Hz, 325 Hz, 400 Hz, 800 Hz, 1200 Hz - allows trade-off between noise rejection and phase delay per application |
| Sensitivity (10-bit) | 1.2967–1.4333 LSB/g - calibrated over full temperature range for accurate g-level quantization in safety algorithms |
| Self-test accuracy | ±10% Δ from stored value - ensures functional integrity verification meets ISO 26262 diagnostic coverage requirements |
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 EMC stability |
| BUS_I | Supply and communication input | Primary DSI3 supply input; powers device and carries command traffic; requires capacitor to BUSRTN |
| BUSRTN | Supply return | DSI3 supply return node; must be connected to system ground plane with low-inductance path |
| BUSSW | Bus switch gate drive | Drives external p-channel FET gate for daisy-chain switching; requires external pullup resistor |
| VBUF | Buffer regulator supply | Provides EMC-immune power to internal regulators; requires 1 μF ceramic capacitor to VSS |
| VREG / VREGA | Internal circuitry supplies | 2.5 V nominal regulated outputs for analog/digital blocks; each requires dedicated 1 μF decoupling |
| VSS | Internal supply return | Common return for all internal regulators; must be tied to BUSRTN in application layout |
| PCM | Pulse code modulated output | 4 MHz test signal proportional to acceleration; unused pins must remain unconnected |
Key Features
| Feature | Design Value |
|---|---|
| DSI3 Discovery Mode | Enables automatic physical location identification in multi-node networks without manual address programming |
| Background Diagnostic Mode | Runs continuously during Periodic Data Collection to verify sensor health without interrupting primary data flow |
| Overdamped mechanical design | Damping ratio ζ = 1.26–3.60 prevents resonance-induced measurement error during high-frequency vibration |
| Interpolated 1 μs timing resolution | Supports precise time-of-arrival measurements across distributed nodes for synchronized crash event reconstruction |
| Self-test with verified response | Guaranteed activation/deactivation times (0.4–4.0 ms) enable deterministic diagnostic scheduling per ASIL-B requirements |
Applications
| Frontal Crash Detection | Rollover Sensing |
|---|---|
Use Scenario: High-speed frontal collision with rapid deceleration exceeding 100 g. IC Role / Device Role / Timing Role: Primary acceleration transducer feeding airbag control unit with validated ±375 g range and <100 μs signal delay. Use Value: Prevents clipping during extreme crash pulses, ensuring accurate trigger decision within ASIL-B timing constraints. | Use Scenario: Vehicle tipping beyond 45° threshold during evasive maneuver or road irregularity. IC Role / Device Role / Timing Role: X-axis inertial sensor detecting sustained lateral acceleration and angular rate proxy. Use Value: Overdamped response eliminates resonance artifacts during chassis oscillation, improving rollover prediction reliability. |
| Side-Impact Occupant Classification | Electronic Stability Control (ESC) Feedback |
Use Scenario: Low-speed side impact where occupant mass affects airbag deployment strategy. IC Role / Device Role / Timing Role: Satellite accelerometer providing real-time X-axis g-data to classify occupant presence/position. Use Value: DSI3 daisy-chain capability allows integration with multiple seat sensors without additional wiring harness complexity. | Use Scenario: Real-time correction of yaw rate estimation during aggressive cornering or split-μ braking. IC Role / Device Role / Timing Role: Redundant X-axis acceleration reference for ESC ECU cross-check against yaw sensor output. Use Value: Background Diagnostic Mode continuously validates sensor integrity while delivering periodic data, meeting ISO 26262 FMEDA requirements. |
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; identical DSI3 interface, pinout, and package | Limited to lower-g crash events; insufficient for rollover or extreme frontal impact validation | Select when system-level g-range requirements do not exceed ±250 g and cost optimization is prioritized |
| ADXL313 | I²C/SPI interface only; no DSI3 support; ±200 g range; 3 mm × 5 mm LGA package | Requires separate bus infrastructure; lacks built-in diagnostics and daisy-chain capability | Choose for non-automotive industrial applications where DSI3 compliance is unnecessary and board space is constrained |
Compared with MMA2725W and ADXL313, the MMA2737W uniquely delivers ±375 g range with DSI3-native fault-tolerant networking and integrated background diagnostics - essential for ASIL-B automotive safety systems requiring end-to-end chain-of-trust validation.
Availability
MMA2737W is available at Aetrix Electronics and suitable for automotive safety systems, crash event recorders, and electronic stability control modules requiring stable component supply across extended product lifecycles.
Supply support for MMA2737W 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 MMA27XXW family was designed specifically for automotive safety-critical inertial sensing, emphasizing DSI3 compliance, AEC-Q100 qualification, and integrated functional safety diagnostics.
FAQ
What is the full-scale range and sensitivity of the MMA2737W?
The MMA2737W has a ±375 g full-scale range. Its nominal sensitivity is 1.2967–1.4333 LSB/g in 10-bit mode, calibrated across -40°C to +125°C. This sensitivity enables precise quantization of high-g events for airbag deployment logic and rollover detection algorithms within the MMA2737W's specified operating envelope.
Does the MMA2737W support daisy-chain topology, and how is it implemented?
Yes, the MMA2737W supports daisy-chain topology via its DSI3 interface and BUSSW pin. The BUSSW pin drives an external p-channel FET gate to connect BUS_I of the next slave device. This implementation requires an external pullup resistor on BUSSW and is fully defined in Section 3.6.4 of the MMA2737W datasheet.
What diagnostic capabilities does the MMA2737W provide during normal operation?
The MMA2737W supports Background Diagnostic Mode (BDM), which runs concurrently with Periodic Data Collection Mode. BDM verifies sensor health-including offset monitor limits, self-test response, and internal regulator status-without interrupting acceleration data transmission. This capability is integral to the MMA2737W's compliance with ASIL-B functional safety requirements.
What are the low-pass filter options available on the MMA2737W, and how are they selected?
The MMA2737W offers six programmable low-pass filter options: 180 Hz (2-pole), 325 Hz (3-pole), 400 Hz (3- or 4-pole), 800 Hz (4-pole), and 1200 Hz (4-pole). Filter selection is performed via DSI3 Command and Response Mode by writing to the appropriate configuration register in the MMA2737W's user-accessible data array.
Is the MMA2737W qualified for automotive applications, and what standards does it meet?
Yes, the MMA2737W is qualified per AEC-Q100 Revision G (Grade 0) and is part of NXP's SafeAssure functional safety solution. It supports ISO 26262 ASIL-B development workflows through integrated diagnostics, deterministic self-test timing, and DSI3 protocol-level error detection - all confirmed in the MMA2737W advance information datasheet Rev. 0.5.
MMA2737W 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:
- ±375g
- Sensitivity (LSB/g):
- 1.365
- 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)
MMA2737W FAQ
1.How can I place an order for MMA2737W through Aetrix?
Please submit a Request for Quotation (RFQ) for MMA2737W 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 MMA2737W reliable?
The price and inventory of MMA2737W are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMA2737W is usually 5 days.
3.What payment methods are accepted for MMA2737W?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMA2737W transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMA2737W?
MMA2737W orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMA2737W 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 MMA2737W?
For technical support, including MMA2737W datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMA2737W requirements.
6.How does Aetrix verify that MMA2737W is sourced from the original manufacturer or authorized distributors?
All MMA2737W 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 MMA2737W meets industry standards.
7.What is the process for return or replacement of MMA2737W?
All MMA2737W units undergo pre-shipment inspection (PSI). If there is an issue with MMA2737W, 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 MMA2737W part is unused and in its original packaging.
Return procedure for MMA2737W:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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