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NXP Semiconductors MMA2612KGCWR2
- Part No.:
- MMA2612KGCWR2
- Manufacturer:
- NXP Semiconductors
- Category:
- Accelerometers
- Package:
- 16-QFN Exposed Pad
- Datasheet:
-
MMA2612KGCWR2.pdf
- Description:
- ACCELEROMETER 125G PCM 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,989
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Product details
Overview
MMA2612KGCWR2 from NXP Semiconductors is an X-axis satellite accelerometer in the MMA26xx SafeAssure family, designed for automotive crash detection systems. It delivers ±125 g full-scale range, DSI2.5 bus compatibility with daisy-chain support, and operates across -40 °C to +125 °C. Its 16-pin QFN (6 mm × 6 mm) package integrates internal high-side bus switching and supports 180 Hz/400 Hz/800 Hz selectable low-pass filtering for airbag control timing integrity.
For engineers reviewing the MMA2612KGCWR2 datasheet, MMA2612KGCWR2 pinout, MMA2612KGCWR2 application, or MMA2612KGCWR2 equivalent, key selection criteria include its AEC-Q100 Grade 1 qualification, DSI2.5 daisy-chain capability, programmable LPF configuration, ±125 g range accuracy, and integrated bus switch for multi-sensor architectures in safety-critical automotive subsystems.
Technical Context
The MMA2612KGCWR2 implements a sigma-delta ADC with SINC filter and configurable IIR low-pass filtering (180 Hz/2-pole, 400 Hz/4-pole, or 800 Hz/4-pole), enabling precise acceleration measurement under transient crash conditions. Its DSI2.5 interface uses BUSIN/BUSOUT signaling with frame- and signal-level thresholds (2.8–3.2 V / 5.5–6.5 V) and supports initialization, self-test, and NVM programming commands.
Internally, it features dual regulated supplies (VREG = 2.50 V ±75 mV, VREGA = 2.50 V ±75 mV), HCAP-based energy storage for bus-powered operation, and a dedicated PCM test output. The g-cell exhibits overdamped mechanical response (damping ratio ζ = 2.76 for ±125 g range) with 12.65 kHz natural frequency and 938 Hz –3 dB rolloff, ensuring minimal phase distortion below 100 Hz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Full-Scale Range | ±125 g - calibrated input range for accurate crash pulse capture without clipping at system-level airbag deployment thresholds |
| Low-Pass Filter Options | 180 Hz (2-pole), 400 Hz (4-pole), or 800 Hz (4-pole) - selectable via OTP to match vehicle-specific crash signature bandwidth requirements |
| DSI2.5 Compatibility | Fully supports mandatory DSI2.5 commands including Initialization, Request ID, Self-Test Enable, and NVM Read/Write - enables interoperability in multi-node daisy-chained sensor networks |
| Operating Temperature | -40 °C to +125 °C - qualified per AEC-Q100 Grade 1, ensuring reliability in engine bay and passenger compartment mounting locations |
| Sensitivity (10-bit) | 4.096 LSB/g - fixed digital gain enabling direct conversion of raw output to g-units without external scaling |
| Internal Bus Switch | On-resistance ≤8.0 Ω - enables robust daisy-chain topology with minimal voltage drop between cascaded sensors on shared BUSIN/BUSOUT lines |
| Sample Rate & Interpolation | 16 μs internal sampling with 1 ms interpolated output - provides deterministic timing for real-time crash decision algorithms |
Pinout & Package
Pb-free 16-pin QFN package, 6 mm × 6 mm × 1.98 mm body with exposed thermal pad (internally connected to VSS). Pin 17 (PAD) must be soldered to VSS for thermal and electrical integrity.
| 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 during factory test mode entry |
| 3 TEST1 | Test Pin | Must be grounded; enables internal test circuitry during calibration |
| 4 BUSRTN | Common Return | Shared ground reference for DSI bus power and signaling - critical for noise immunity in high-voltage automotive environments |
| 5 PCM | PCM Output | 4 MHz pulse-code modulated output proportional to acceleration; enabled via OTP bit DEVCFG2[5] for lab validation only |
| 6 BUSOUT | DSI Bus Output | Internally switched connection to BUSIN; closed after Initialization command to enable daisy-chain slave-to-master linking |
| 7 BUSIN | DSI Bus Input/Supply | Primary power and communication node; requires external decoupling capacitor (C1) to BUSRTN for ESD and ripple suppression |
| 8 HCAP | Hold Capacitor Node | Rectifies BUSIN voltage to sustain internal regulators during bus signaling gaps; requires external storage capacitor (C3) to BUSRTN |
| 9 CREG | Digital Supply | Power rail for digital logic and interface; requires 500–1500 nF ceramic capacitor to VSS per layout guidelines |
| 10 TEST4 | Test Pin | Must be grounded; part of factory test access path for OTP programming verification |
| 11 CREGA | Analog Supply | Power rail for analog front-end and ADC; requires dedicated 500–1500 nF capacitor to VSSA for PSRR optimization |
| 12 VSSA | Analog Ground | Isolated return for analog circuitry; must be separated from digital ground except at single-point star connection |
| 13 TEST5 | Test Voltage Input | Supplies SPI programming voltage during test; must be grounded in application to prevent unintended OTP writes |
| 14 TEST6 | Test Pin | Must be grounded; used for boundary scan and internal logic state capture |
| 15 TEST7 | Test Pin | Must be grounded; enables diagnostic register readout during production test |
| 16 VSS | Digital Ground | Return path for digital circuitry and I/O; connects internally to exposed thermal pad (Pin 17) |
Key Features
| Feature | Design Value |
|---|---|
| DSI2.5 Daisy-Chain Support | Integrated high-side bus switch eliminates need for external discrete switches, reducing BOM count and PCB area in multi-accelerometer airbag modules |
| AEC-Q100 Grade 1 Qualification | Validated for continuous operation from -40 °C to +125 °C, meeting automotive safety system lifetime and thermal cycling requirements |
| Overdamped Mechanical Response | ζ = 2.76 damping ratio prevents resonance-induced false triggers during high-frequency road noise or engine vibration |
| Programmable Low-Pass Filtering | Three factory-configurable LPF options allow tuning to vehicle-specific crash pulse profiles without hardware change |
| Self-Test Capability | Deterministic electrostatic deflection (ΔDFLCT_X125 = 49 LSB typical) enables in-system functional verification prior to deployment |
| Bus-Powered Architecture | HCAP-based energy storage allows operation from DSI bus alone - no separate VCC supply required in daisy-chain configurations |
Applications
| Front Airbag Crash Detection | Side-Impact Airbag Deployment |
|---|---|
Use Scenario: Detects rapid deceleration during frontal collision events to trigger airbag inflation within <10 ms latency. IC Role / Device Role / Timing Role: Primary X-axis acceleration sensor providing time-critical analog-to-digital data to airbag control unit (ACU) via DSI2.5 bus. Use Value: ±125 g range and 180 Hz LPF ensure accurate capture of peak crash pulses while rejecting high-frequency suspension noise. | Use Scenario: Monitors lateral acceleration during side-impact collisions to initiate curtain and seat-mounted airbag deployment. IC Role / Device Role / Timing Role: Satellite X-axis accelerometer in distributed sensor architecture, communicating over DSI2.5 daisy chain to central ACU. Use Value: Internal bus switch enables compact multi-sensor placement along door rails without additional level-shifting or isolation components. |
| Rollover Detection System | Occupant Position Sensing |
Use Scenario: Measures longitudinal acceleration combined with yaw rate to determine vehicle roll angle and initiate roof rail airbags. IC Role / Device Role / Timing Role: Secondary acceleration reference in rollover algorithm, synchronized via DSI2.5 frame timing to avoid timestamp skew. Use Value: 16 μs internal sample rate and 1 ms interpolation provide deterministic timing alignment with other vehicle sensors. | Use Scenario: Detects occupant proximity and posture changes to adjust airbag deployment force and timing based on seat position. IC Role / Device Role / Timing Role: Low-power satellite sensor feeding real-time acceleration data to occupant classification ECU via DSI2.5. Use Value: Bus-powered operation (via BUSIN/HCAP) eliminates need for local regulator, reducing footprint in space-constrained seat electronics. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar satellite accelerometer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMA2612KGCW | Tubes packaging vs. Tape & Reel (R2); identical electrical specs, pinout, and OTP configuration | Not suitable for automated SMT assembly; requires manual loading or tube-to-reel conversion | Select MMA2612KGCWR2 for high-volume production lines requiring pick-and-place compatibility and moisture-sensitive device handling compliance |
| MMA2618KGCWR2 | ±187 g full-scale range; higher g-cell clipping limit (1750–2300 g); same DSI2.5 interface and package | Better suited for heavy-truck or off-road vehicle crash detection where higher peak accelerations occur | Choose MMA2612KGCWR2 when system-level crash pulse analysis confirms ±125 g headroom is sufficient - avoids overspec and cost premium |
Compared with MMA2612KGCW, the R2 suffix ensures tape-and-reel delivery for automated manufacturing; compared with MMA2618KGCWR2, the lower range improves resolution (4.096 vs. 2.731 LSB/g) and reduces quantization error in passenger car crash signatures.
Availability
MMA2612KGCWR2 is available at Aetrix Electronics and suitable for front airbag crash detection, side-impact deployment systems, and rollover sensing applications requiring stable component supply across automotive production lifecycles.
Supply support for MMA2612KGCWR2 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 markets.
The MMA26xx family is part of NXP's SafeAssure portfolio, engineered specifically for ASIL-B compliant automotive safety systems requiring high-integrity inertial sensing in crash event detection and occupant protection.
FAQ
What is the full-scale range of the MMA2612KGCWR2?
The MMA2612KGCWR2 has a nominal full-scale range of ±125 g. This range is factory-programmed into the RNG[3:0] bits of the TYPE register (0b0100) and is optimized for passenger vehicle frontal crash pulse detection. Sensitivity is fixed at 4.096 LSB/g in 10-bit mode, and the g-cell mechanical clipping limit is 353–409 g depending on filter selection. The MMA2612KGCWR2 maintains this range across its full operating temperature span of -40 °C to +125 °C.
Does the MMA2612KGCWR2 support daisy-chain configuration?
Yes, the MMA2612KGCWR2 supports DSI2.5 daisy-chain topology via its integrated high-side bus switch. When an Initialization command is received on BUSIN, the internal switch closes, connecting BUSOUT to BUSIN of the next device. BUSOUT has a maximum on-resistance of 8.0 Ω and supports up to six devices in series. The MMA2612KGCWR2 must be configured with a unique DSI address (via DEVCFG2[3:0]) or assigned dynamically during initialization to avoid bus contention.
What low-pass filter options are available on the MMA2612KGCWR2?
The MMA2612KGCWR2 offers three factory-selectable low-pass filter configurations: 180 Hz (2-pole), 400 Hz (4-pole), or 800 Hz (4-pole). These are set via LPF[1:0] bits (TYPE[7:6]) and cannot be changed in-field. The 180 Hz option is recommended for standard airbag deployment algorithms to suppress road noise above crash signature bandwidth; 400 Hz/800 Hz variants trade noise rejection for faster step response in specialized applications.
Is the MMA2612KGCWR2 qualified for automotive use?
Yes, the MMA2612KGCWR2 is qualified to AEC-Q100 Revision G, Grade 1 (-40 °C to +125 °C), and is part of NXP's SafeAssure functional safety solution. It includes built-in self-test, OTP CRC error detection for factory and user arrays, and meets ISO 26262 ASIL-B requirements for sensor elements in airbag control units. The device undergoes accelerated life testing, thermal cycling, and mechanical shock validation per automotive qualification standards.
What is the purpose of the HCAP pin on the MMA2612KGCWR2?
The HCAP pin on the MMA2612KGCWR2 rectifies the BUSIN supply voltage to generate an internal hold-up voltage, enabling continuous operation during DSI bus signaling gaps. An external capacitor (C3, 1–100 μF) must be connected between HCAP and BUSRTN to store energy. This architecture eliminates the need for a separate VCC supply in daisy-chain configurations, simplifying power design and reducing system-level component count for the MMA2612KGCWR2.
MMA2612KGCWR2 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:
- ±125g
- Sensitivity (LSB/g):
- 4.096
- 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-EP (6x6)
MMA2612KGCWR2 FAQ
1.How can I place an order for MMA2612KGCWR2 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMA2612KGCWR2 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 MMA2612KGCWR2 reliable?
The price and inventory of MMA2612KGCWR2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMA2612KGCWR2 is usually 5 days.
3.What payment methods are accepted for MMA2612KGCWR2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMA2612KGCWR2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMA2612KGCWR2?
MMA2612KGCWR2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMA2612KGCWR2 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 MMA2612KGCWR2?
For technical support, including MMA2612KGCWR2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMA2612KGCWR2 requirements.
6.How does Aetrix verify that MMA2612KGCWR2 is sourced from the original manufacturer or authorized distributors?
All MMA2612KGCWR2 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 MMA2612KGCWR2 meets industry standards.
7.What is the process for return or replacement of MMA2612KGCWR2?
All MMA2612KGCWR2 units undergo pre-shipment inspection (PSI). If there is an issue with MMA2612KGCWR2, 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 MMA2612KGCWR2 part is unused and in its original packaging.
Return procedure for MMA2612KGCWR2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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