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NXP Semiconductors MMA5212AKWR2
- Part No.:
- MMA5212AKWR2
- Manufacturer:
- NXP Semiconductors
- Category:
- Accelerometers
- Package:
- 16-QFN Exposed Pad
- Datasheet:
-
MMA5212AKWR2.pdf
- Description:
- ACCELEROMETER 120G SPI 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,651
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Product details
Overview
MMA5212AKWR2 from NXP Semiconductors (formerly Freescale) is an X-axis PSI5-compatible inertial sensor designed for automotive crash detection systems. It delivers ±120g full-scale range, 400 Hz 3-pole low-pass filtering, 16 μs internal sampling with 1 μs interpolation, PSI5 v1.3 asynchronous mode operation at 125 kBaud, and AEC-Q100 Grade 1 qualification (-40°C to +125°C). It operates in airbag front/side crash sensing applications where high-g reliability and EMC-immune current-mode communication are critical.
For engineers reviewing the MMA5212AKWR2 datasheet, MMA5212AKWR2 pinout, MMA5212AKWR2 application, or MMA5212AKWR2 equivalent, this page provides verified technical context, exact pin functions, real-world use cases in automotive safety systems, confirmed alternatives with functional trade-offs, and supply-chain support details specific to OEM and Tier-1 production programs.
Technical Context
The MMA5212AKWR2 implements an overdamped MEMS g-cell with natural frequency of 12.65 kHz and damping ratio of 2.76, paired with a 3rd-order sinc decimation filter (16:1 decimation), 400 Hz low-pass filter, and configurable high-pass filter (0.04/0.1/0.3 Hz options). Its PSI5 interface uses current modulation on IDATA with 125 kBaud asynchronous timing and even-parity error detection.
Digital signal processing includes offset cancellation with dual-stage startup, self-test capability producing 40 LSB output at ±120g range, and internal voltage regulation via VBUF/VREG/VREGA rails - all monitored for undervoltage and capacitor disconnection faults per AEC-Q100 requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Full-Scale Range | ±120g - defines maximum measurable acceleration before clipping; matches front/side airbag deployment thresholds |
| PSI5 Interface | Version 1.3 asynchronous mode, 125 kBaud - enables robust, noise-immune current-loop communication over long harness runs |
| Low-Pass Filter | 400 Hz, 3-pole - suppresses high-frequency noise while preserving crash pulse integrity up to ~100 Hz |
| Internal Sampling | 16 μs period, interpolated to 1 μs - supports precise time-of-impact calculation in safety-critical event recording |
| Operating Temperature | -40°C to +125°C (AEC-Q100 Grade 1) - ensures functionality across full automotive under-hood and cabin environments |
| Supply Voltage Range | VCC = 4.2 V to 17.0 V - accommodates wide battery voltage swings including load-dump transients |
| Sensitivity | 4 LSB/g (typical) - yields 10-bit output resolution of ~0.12g per LSB for accurate crash severity classification |
Pinout & Package
Pb-free 16-pin QFN package (Case 2086-01, 6 mm × 6 mm, 0.5 mm pitch) with exposed thermal pad internally connected to VSS.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | PSI5 Power & Data Line Supply | Primary power input; supplies internal regulators via external resistor; requires 2.2 nF + 15 nF decoupling to VSS |
| IDATA | PSI5 Response Current Output | Modulated current sink for PSI5 data transmission; requires 27Ω series resistor to VCC |
| VBUF | Buffer Regulator Input | Feeds isolated analog/digital supplies (VREGA/VREG); provides EMC immunity; needs 1 μF capacitor to VSS |
| VREGA | Analog Supply Rail | 2.5 V ±75 mV regulated output for sensor front-end and ΣΔ converter; requires 1 μF capacitor to VSSA |
| VREG | Digital Supply Rail | 2.5 V ±75 mV regulated output for DSP, SPI, and logic; requires 1 μF capacitor to VSS |
| VSS / VSSA | Digital & Analog Ground | Separate ground returns prevent noise coupling between digital switching and analog signal chain |
| NC (Pins 5, 15) | No Connect | Must remain unconnected; no internal bonding or function |
| TEST, SCLK, DOUT, DIN, CS | SPI Test Interface | Factory test-only pins; must be grounded or left floating in application; not used during normal PSI5 operation |
Key Features
| Feature | Design Value |
|---|---|
| PSI5 v1.3 Asynchronous Mode Compliance | Enables direct integration into existing PSI5 automotive networks without protocol translation or gateway intervention |
| Overdamped MEMS Sensing Element | Eliminates resonance-induced measurement errors during high-slew crash events; damping ratio = 2.76 ensures monotonic step response |
| Integrated Offset Cancellation | Two-stage digital compensation reduces zero-g offset to ±1 LSB (0.12g), enabling reliable static tilt immunity in mounting orientations |
| Voltage Regulator Monitoring | Dual-level undervoltage detection (VCC, VBUF, VREG, VREGA) with hysteresis prevents erroneous outputs during brownout conditions |
| Capacitor Disconnection Detection | Active monitoring of VBUF/VREG/VREGA external capacitors ensures regulator stability; forces reset if open-circuit fault occurs |
Applications
| Airbag Front Crash Detection | Airbag Side Impact Detection |
|---|---|
Use Scenario: Mounted on vehicle firewall or tunnel to detect frontal collision pulses exceeding 10g within 10–30 ms. IC Role / Device Role / Timing Role: Primary X-axis acceleration sensor providing real-time crash severity data via PSI5 to airbag control unit (ACU). Use Value: ±120g range and 400 Hz LPF ensure accurate capture of peak deceleration without aliasing or saturation during typical frontal crash profiles. | Use Scenario: Installed in door pillar or seat structure to sense lateral acceleration during side collisions or rollovers. IC Role / Device Role / Timing Role: Dedicated X-axis satellite accelerometer feeding PSI5 stream to ACU for side airbag and curtain deployment decisions. Use Value: AEC-Q100 Grade 1 rating and 12.65 kHz g-cell resonance guarantee operational integrity in harsh mechanical environments with high shock exposure. |
| Seat Belt Pretensioner Activation | Occupant Classification System Support |
Use Scenario: Integrated into seat-mounted sensing module to trigger pretensioner within 25 ms of crash onset based on acceleration slope. IC Role / Device Role / Timing Role: High-speed inertial trigger with 16 μs sampling and 1 μs interpolation enabling precise jerk-based activation logic. Use Value: Fast startup HPF (0.3 Hz) and low-latency DSP path allow immediate response to rapid acceleration transients without DC drift accumulation. | Use Scenario: Paired with other sensors to distinguish adult vs. child occupant weight and position using low-frequency motion signatures. IC Role / Device Role / Timing Role: Low-noise X-axis reference sensor supplying stable baseline acceleration data for algorithmic occupancy analysis. Use Value: RMS noise ≤1.0 LSB (0.12g) and 0.04 Hz HPF option enable discrimination of subtle occupant micro-movements below 0.5 Hz. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar inertial sensor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| NXP MMA5224AKWR2 | ±240g full-scale range; higher g-cell clipping limit (2065g); same PSI5 interface and package | Better suited for rollover detection or heavy-truck crash sensing requiring extended dynamic range | Select when system-level crash pulse modeling predicts peak acceleration >120g but <240g; retains identical PCB layout and firmware interface |
| Analog Devices ADXL316WBRMZ-RL | 3-axis ±16g I²C/SPI accelerometer; 1.8 V supply; no PSI5 support; different package (12-lead LFCSP) | Requires external level-shifting and protocol translation; suitable only for non-PSI5 subsystems or prototyping | Choose only for development platforms needing multi-axis data or where PSI5 infrastructure is unavailable; not drop-in compatible |
Compared with MMA5212AKWR2, MMA5224AKWR2 extends dynamic range while maintaining pinout, interface, and qualification - ideal for platform scalability. ADXL316WBRMZ-RL offers multi-axis capability but lacks PSI5 compliance and automotive qualification, necessitating redesign for production deployment.
Availability
MMA5212AKWR2 is available at Aetrix Electronics and suitable for airbag front crash detection, side impact sensing, seat belt pretensioner activation, and occupant classification systems requiring stable component supply across automotive production lifecycles.
Supply support for MMA5212AKWR2 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 automotive-grade sensors and safety-critical systems.
The MMA52xxAKW product line was engineered specifically for PSI5-based automotive safety applications, delivering AEC-Q100 qualified inertial sensing with integrated diagnostics, EMC-hardened current-mode communication, and deterministic latency for airbag control units.
FAQ
What is the full-scale range and sensitivity of the MMA5212AKWR2?
The MMA5212AKWR2 has a ±120g full-scale range with typical sensitivity of 4 LSB/g in 10-bit mode. This yields a resolution of approximately 0.12g per LSB, validated across -40°C to +125°C per AEC-Q100 testing. The device maintains ±7% total sensitivity error over temperature and supply voltage variations, ensuring consistent crash severity classification in MMA5212AKWR2-based airbag systems.
Does the MMA5212AKWR2 support PSI5 Version 1.3 asynchronous mode?
Yes, the MMA5212AKWR2 fully complies with PSI5 Version 1.3 asynchronous mode specifications, including 125 kBaud data rate, 10-bit payload, even-parity error detection, and PSI5-A10P-228/1L compatibility. Its IDATA pin modulates response current per PSI5 timing requirements, and internal logic handles sync pulse detection and frame alignment without external controller intervention - a core requirement for MMA5212AKWR2 integration into automotive safety networks.
What is the operating temperature range and qualification status of the MMA5212AKWR2?
The MMA5212AKWR2 is qualified to AEC-Q100 Revision G, Grade 1, with guaranteed operation from -40°C to +125°C ambient temperature. This qualification includes stress testing for thermal cycling, humidity, mechanical shock (±2500g unpowered), and ESD (±4000 V HBM). The MMA5212AKWR2's internal voltage monitors and regulator fault detection circuits remain fully functional across this entire range, meeting ISO 26262 ASIL-B readiness requirements for safety-related applications.
How does the MMA5212AKWR2 handle power supply disturbances such as micro-cuts?
The MMA5212AKWR2 incorporates multiple protection mechanisms against supply disturbances: VCC micro-cut survival time is guaranteed ≥50 μs with 1 μF capacitors; undervoltage monitors on VCC, VBUF, VREG, and VREGA force internal reset if thresholds are breached; and capacitor disconnection detection actively tests VBUF/VREG/VREGA external caps every ~12 ms. During a VCC micro-cut, PSI5 transmission halts immediately and resumes after the next valid sync pulse - behavior rigorously validated in MMA5212AKWR2 production testing.
What diagnostic features are built into the MMA5212AKWR2 for functional safety compliance?
The MMA5212AKWR2 integrates several diagnostics required for ASIL-B compliance: CRC-protected OTP memory with factory lock verification, continuous offset monitor (±66 LSB limit), self-test capability producing known 40 LSB output, internal voltage rail monitoring with hysteresis, capacitor disconnection detection, and status flags (IDEN_B, IDEF_B, OFF_B) accessible via PSI5 readback. All diagnostics are active during normal operation and reported in real time - a key enabler for MMA5212AKWR2 use in ISO 26262-compliant airbag control units.
MMA5212AKWR2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- MMA
- Package/Case:
- 16-QFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Digital
- Axis:
- X
- Acceleration Range:
- ±120g
- Sensitivity (LSB/g):
- 4
- Sensitivity (mV/g):
- -
- Bandwidth:
- -
- Output Type:
- SPI
- Voltage - Supply:
- 4.2V ~ 17V
- Features:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QFN (6x6)
MMA5212AKWR2 FAQ
1.How can I place an order for MMA5212AKWR2 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMA5212AKWR2 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 MMA5212AKWR2 reliable?
The price and inventory of MMA5212AKWR2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMA5212AKWR2 is usually 5 days.
3.What payment methods are accepted for MMA5212AKWR2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMA5212AKWR2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMA5212AKWR2?
MMA5212AKWR2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMA5212AKWR2 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 MMA5212AKWR2?
For technical support, including MMA5212AKWR2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMA5212AKWR2 requirements.
6.How does Aetrix verify that MMA5212AKWR2 is sourced from the original manufacturer or authorized distributors?
All MMA5212AKWR2 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 MMA5212AKWR2 meets industry standards.
7.What is the process for return or replacement of MMA5212AKWR2?
All MMA5212AKWR2 units undergo pre-shipment inspection (PSI). If there is an issue with MMA5212AKWR2, 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 MMA5212AKWR2 part is unused and in its original packaging.
Return procedure for MMA5212AKWR2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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