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NXP Semiconductors MMA2631NKGCWR2
- Part No.:
- MMA2631NKGCWR2
- Manufacturer:
- NXP Semiconductors
- Category:
- Accelerometers
- Package:
- 16-QFN Exposed Pad
- Datasheet:
-
MMA2631NKGCWR2.pdf
- Description:
- ACCELEROMETER 312G PCM 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,094
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Product details
Overview
MMA2631NKGCWR2 from NXP Semiconductors is a DSI2.5-compatible, overdamped X-axis satellite accelerometer with ±312 g full-scale range, 16 μs internal sample rate (interpolated to 1 ms), and integrated high-side bus switch for daisy-chain configurations in automotive airbag crash detection systems.
For engineers reviewing the MMA2631NKGCWR2 datasheet, MMA2631NKGCWR2 pinout, MMA2631NKGCWR2 application, or MMA2631NKGCWR2 equivalent, key selection criteria include AEC-Q100 Grade 1 qualification (-40 °C to +125 °C), selectable 180/400/800 Hz low-pass filters, DSI2.5 command compliance, and QFN-16 (6 mm × 6 mm) package compatibility with automotive safety-critical timing and signal integrity requirements.
Technical Context
The MMA2631NKGCWR2 implements a sigma-delta ADC with SINC filter compensation and programmable IIR low-pass filtering (180 Hz/2-pole, 400 Hz/4-pole, or 800 Hz/4-pole), directly supporting DSI2.5 serial interface timing with 100–200 kbps data rate and frame-based command protocol including Initialization, Clear, and Request ID.
Its internal architecture includes dual regulated supplies (VREG = 2.5 V ±75 mV, VREGA = 2.5 V ±75 mV), HCAP-based energy harvesting from BUSIN, and dedicated analog/digital ground separation (VSSA/VSS) - all optimized for robust operation under transient bus voltage conditions and ESD stress in vehicle crash-sensing environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Full-Scale Range | ±312 g - enables detection of high-deceleration frontal/side impacts without clipping in airbag control units. |
| Low-Pass Filter Options | Selectable 180 Hz (2-pole), 400 Hz (4-pole), or 800 Hz (4-pole) - configurable via OTP to match crash pulse bandwidth and noise rejection needs. |
| DSI2.5 Compliance | Fully supports mandatory commands (Initialization, Clear, Request ID, Status Read) - ensures interoperability in multi-node daisy-chained sensor networks. |
| Operating Temperature | -40 °C to +125 °C - qualified per AEC-Q100 Grade 1, validated for under-hood and passenger compartment mounting. |
| Internal Sample Rate | 16 μs (62.5 kHz) with interpolation to 1 ms output - provides deterministic latency for real-time crash decision algorithms. |
| Sensitivity (10-bit) | 1.638 LSB/g - fixed digital gain calibrated at factory; total sensitivity error ≤ ±7% over temperature. |
| Package | Pb-free 16-pin QFN, 6 mm × 6 mm × 1.98 mm - surface-mount compatible with automotive PCB assembly and thermal cycling reliability. |
Pinout & Package
Pb-free 16-pin QFN package (6 mm × 6 mm × 1.98 mm) with exposed die attach pad connected to VSS. Pin 17 (PAD) must be soldered to ground plane for thermal and electrical stability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 TEST2 | Test Pin | Must remain unconnected in production; no functional role in normal operation. |
| 2 TEST3 | Test Pin | Must be grounded; used internally for test mode entry and calibration verification. |
| 3 TEST1 | Test Pin | Must be grounded; enables factory programming and diagnostic access paths. |
| 4 BUSRTN | Common Return | Shared ground reference for BUSIN/BUSOUT power and signaling; critical for DSI common-mode noise rejection. |
| 5 PCM | PCM Output | 4 MHz pulse-code modulated acceleration output; enabled/disabled via OTP bit DEVCFG2[5] for test-only use. |
| 6 BUSOUT | DSI Bus Output | Internally switched connection to BUSIN; closed after Initialization command for daisy-chain slave-to-master linking. |
| 7 BUSIN | DSI Power & Data Input | Supplies device and carries DSI commands; requires external decoupling capacitor (C1) to BUSRTN per Figure 1. |
| 8 HCAP | Hold Capacitor Node | Rectifies BUSIN to generate internal supply; requires external storage capacitor (C3) to BUSRTN for uninterrupted signaling during bus transients. |
| 9 CREG | Digital Supply | Power rail for digital logic and interface; requires 500–1500 nF ceramic capacitor to VSS for stable 2.5 V regulation. |
| 10 TEST4 | Test Pin | Must be grounded; part of factory test chain for oscillator and self-test validation. |
| 11 CREGA | Analog Supply | Power rail for sigma-delta converter and g-cell interface; requires 500–1500 nF ceramic capacitor to VSSA. |
| 12 VSSA | Analog Ground | Dedicated return for analog circuitry; must be isolated from digital ground except at single-point star connection. |
| 13 TEST5 | SPI Programming Voltage | Ground in operation; supplies programming voltage during wafer-level test; floating or driven high causes undefined behavior. |
| 14 TEST6 | Test Pin | Must be grounded; used for internal clock monitoring and POR timing validation. |
| 15 TEST7 | Test Pin | Must be grounded; enables boundary scan and internal register access during production test. |
| 16 VSS | Digital Ground | Dedicated return for digital logic; connects to exposed PAD (Pin 17) for thermal dissipation and noise control. |
Key Features
| Feature | Design Value |
|---|---|
| DSI2.5 Daisy Chain Support | Integrated high-side bus switch eliminates need for external FETs in multi-sensor crash detection modules. |
| AEC-Q100 Grade 1 Qualification | Validated for -40 °C to +125 °C operation with full electrical testing across temperature extremes. |
| Overdamped Sensing Element | Damping ratio ζ = 1.26–3.60 (range-dependent) prevents resonance-induced false triggers during high-frequency vehicle vibrations. |
| Self-Test Capability | Electrostatic actuation provides repeatable offset deflection (±49 LSB @ 312 g range) for in-system diagnostics without mechanical stimulus. |
| Robust Power Architecture | HCAP-based energy harvesting sustains operation during BUSIN voltage dips; dual-regulator design isolates analog/digital noise sources. |
Applications
| Airbag Front Crash Detection | Airbag Side Impact Detection |
|---|---|
Use Scenario: Mounted on vehicle firewall or front rail to detect rapid deceleration during frontal collisions. IC Role / Device Role / Timing Role: Primary X-axis acceleration sensor feeding real-time data to airbag control unit (ACU) for deployment decision within 10–30 ms. Use Value: ±312 g range captures high-speed crash pulses without saturation; 180 Hz LPF rejects road noise while preserving crash signature rise time. | Use Scenario: Installed in door pillar or seat structure to sense lateral acceleration during side-impact collisions. IC Role / Device Role / Timing Role: Satellite accelerometer providing orthogonal axis input to ACU for side-curtain and torso airbag triggering. Use Value: Overdamped g-cell (ζ ≥ 1.26) suppresses resonant response to door panel flex modes; DSI2.5 daisy chain reduces wiring harness complexity. |
| Seat Belt Pretensioner Activation | Occupant Classification System |
Use Scenario: Integrated into seat-mounted sensing module to detect pre-crash braking or low-speed rear-end impact. IC Role / Device Role / Timing Role: Secondary acceleration monitor enabling pretensioner pre-tensioning before main crash event. Use Value: 1 ms interpolated output latency ensures timely mechanical response; AEC-Q100 qualification guarantees reliability over 15-year vehicle lifetime. | Use Scenario: Paired with pressure sensors in seat cushion to distinguish adult vs. child occupant based on dynamic mass response. IC Role / Device Role / Timing Role: High-bandwidth motion detector capturing occupant settling dynamics and vibration signatures. Use Value: 800 Hz LPF option enables analysis of fine-grained occupant movement; ±312 g range accommodates aggressive seat adjustment maneuvers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar satellite accelerometer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMA2612KGCWR2 | ±125 g full-scale range; lower sensitivity (4.096 LSB/g); identical DSI2.5 interface and package. | Optimized for lower-deceleration crash events (e.g., rear-end collisions); reduced overload margin. | Select when system-level crash pulse modeling confirms <125 g peak acceleration and cost optimization is prioritized. |
| MMA2618KGCWR2 | ±187 g full-scale range; sensitivity 2.731 LSB/g; same pinout, temperature rating, and DSI2.5 compliance. | Balances dynamic range and resolution for mid-tier airbag systems requiring higher fidelity than 125 g but less headroom than 312 g. | Choose for applications needing margin above 125 g without full 312 g overhead - e.g., compact SUVs with shorter crumple zones. |
Compared with MMA2612KGCWR2 and MMA2618KGCWR2, the MMA2631NKGCWR2 delivers maximum overload tolerance for high-speed frontal impacts while maintaining identical DSI2.5 interoperability and AEC-Q100 Grade 1 reliability - making it the preferred choice where worst-case crash energy exceeds 187 g.
Availability
MMA2631NKGCWR2 is available at Aetrix Electronics and suitable for automotive airbag control units, seat belt pretensioner modules, and occupant classification systems requiring stable component supply across extended vehicle production lifecycles.
Supply support for MMA2631NKGCWR2 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.
The MMA26xx family is designed specifically for automotive safety-critical inertial sensing, delivering DSI2.5-compliant satellite accelerometers with AEC-Q100 qualification and integrated bus switching for crash detection subsystems.
FAQ
What is the full-scale acceleration range of the MMA2631NKGCWR2?
The MMA2631NKGCWR2 has a nominal full-scale range of ±312 g, verified per its factory-programmed RANGE bits (RNG[3:0] = 0110) in the TYPE register. This range is optimized for high-deceleration frontal crash detection in automotive airbag systems and remains stable across the full -40 °C to +125 °C operating temperature range.
Does the MMA2631NKGCWR2 support daisy-chain configuration via DSI2.5?
Yes, the MMA2631NKGCWR2 supports DSI2.5 daisy chaining through its integrated high-side bus switch. When an Initialization command is received on BUSIN, the internal switch closes to connect BUSIN to BUSOUT, enabling cascaded communication with downstream slaves. The switch opens automatically upon reset or Clear command.
What low-pass filter options are available on the MMA2631NKGCWR2?
The MMA2631NKGCWR2 offers three factory- or user-programmable low-pass filter options: 180 Hz (2-pole), 400 Hz (4-pole), or 800 Hz (4-pole). These are selected via LPF[1:0] bits in the TYPE register and affect both noise rejection and phase delay - with 180 Hz providing best immunity to road noise and 800 Hz preserving highest signal bandwidth.
Is the MMA2631NKGCWR2 qualified for automotive use?
Yes, the MMA2631NKGCWR2 is qualified to AEC-Q100 Revision G, Grade 1, covering -40 °C to +125 °C operation. It undergoes full qualification testing including temperature cycling, humidity bias, mechanical shock, and ESD (HBM ±2000 V), ensuring reliability in safety-critical automotive crash detection applications.
What is the function of the HCAP pin on the MMA2631NKGCWR2?
The HCAP pin on the MMA2631NKGCWR2 rectifies the BUSIN supply voltage to generate internal operating power. An external capacitor (C3, 1–100 μF) must be connected between HCAP and BUSRTN to store energy and maintain stable operation during DSI bus signaling transients - a key feature enabling robust performance in noisy automotive electrical environments.
MMA2631NKGCWR2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- MMA
- Package/Case:
- 16-QFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Digital
- Axis:
- X
- Acceleration Range:
- ±312g
- Sensitivity (LSB/g):
- 1.64
- Sensitivity (mV/g):
- -
- Bandwidth:
- -
- Output Type:
- PCM
- Voltage - Supply:
- 6.3V ~ 30V
- 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)
MMA2631NKGCWR2 FAQ
1.How can I place an order for MMA2631NKGCWR2 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMA2631NKGCWR2 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 MMA2631NKGCWR2 reliable?
The price and inventory of MMA2631NKGCWR2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMA2631NKGCWR2 is usually 5 days.
3.What payment methods are accepted for MMA2631NKGCWR2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMA2631NKGCWR2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMA2631NKGCWR2?
MMA2631NKGCWR2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMA2631NKGCWR2 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 MMA2631NKGCWR2?
For technical support, including MMA2631NKGCWR2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMA2631NKGCWR2 requirements.
6.How does Aetrix verify that MMA2631NKGCWR2 is sourced from the original manufacturer or authorized distributors?
All MMA2631NKGCWR2 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 MMA2631NKGCWR2 meets industry standards.
7.What is the process for return or replacement of MMA2631NKGCWR2?
All MMA2631NKGCWR2 units undergo pre-shipment inspection (PSI). If there is an issue with MMA2631NKGCWR2, 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 MMA2631NKGCWR2 part is unused and in its original packaging.
Return procedure for MMA2631NKGCWR2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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