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NXP Semiconductors MMA5212KWR2
- Part No.:
- MMA5212KWR2
- Manufacturer:
- NXP Semiconductors
- Category:
- Accelerometers
- Package:
- 16-QFN Exposed Pad
- Datasheet:
-
MMA5212KWR2.pdf
- Description:
- ACCELEROMETER 120G PCM/SPI 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,353
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Product details
Overview
MMA5212KWR2 from NXP Semiconductors (formerly Freescale) is a PSI5-compliant, X-axis satellite accelerometer with ±120g full-scale range, 16-pin QFN package, AEC-Q100 Grade 1 qualification (-40°C to +125°C), and integrated 400 Hz low-pass filter. It delivers 10-bit digital output via PSI5 interface for airbag crash detection in automotive safety systems.
For engineers reviewing the MMA5212KWR2 datasheet, MMA5212KWR2 pinout, MMA5212KWR2 application, or MMA5212KWR2 equivalent, key selection criteria include PSI5 v1.3 compliance, programmable time slots (0.5 μs resolution), selectable baud rates (125/190.5 kBaud), 16 μs internal sample rate with 1 μs interpolation, and daisy-chain capability with external low-side switch.
Technical Context
The MMA5212KWR2 implements an overdamped MEMS g-cell with natural frequency of 12.65 kHz and damping ratio of 2.76–6.77, enabling robust crash pulse response without resonance artifacts. Its signal chain includes a ΣΔ ADC, SINC filter, and configurable IIR low-pass filter (3-pole or 4-pole at 400 Hz) plus single-pole high-pass filter with fast startup.
PSI5 communication uses current-modulated two-wire signaling on IDATA/VCC lines, supporting synchronous/asynchronous modes, 8- or 10-bit data length, even parity or 3-bit CRC error detection, and optional daisy-chain addressing via BUS_SW-driven external FET. Internal oscillator operates at 4 MHz ±5%.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Full-Scale Range | ±120g - defines maximum measurable acceleration before clipping; supports front/side crash detection per ISO 26262 ASIL-B requirements. |
| PSI5 Compliance | PSI5 v1.3 - ensures interoperability with automotive body controllers and diagnostic tools using standardized current-loop protocol. |
| Output Resolution | 10-bit digital - provides 2048 LSB/g sensitivity with ±5% total sensitivity error over temperature and supply voltage. |
| Filter Configuration | Selectable 400 Hz, 3-pole or 4-pole LPF - enables tuning of bandwidth vs. noise trade-off for specific crash pulse profiles. |
| Operating Temperature | AEC-Q100 Grade 1: -40°C to +125°C - qualified for under-hood and passenger compartment mounting locations. |
| Internal Sample Rate | 16 μs (62.5 kHz) with 1 μs interpolation - supports precise timing alignment across multiple sensors in synchronized sampling mode. |
| Power Supply | VCC = 4.2–17.0 V - compatible with automotive 12 V battery systems including load-dump transients up to +25 V. |
Pinout & Package
Pb-free 16-pin QFN (6 mm × 6 mm, case 2086-01), exposed thermal pad internally connected to VSS. Pin 17 (die attach pad) must be soldered to PCB ground plane for thermal and EMC performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | PSI5 Power & Data Line | Supplies power and carries modulated response current; requires 2.2 nF decoupling capacitor to VSS. |
| IDATA | PSI5 Response Current Output | Modulates current (IIDLE+22–30 mA) to encode acceleration data; connects to same line as VCC via series resistor. |
| VBUF | Buffer Regulator Input | Drives internal analog/digital regulators (VREGA/VREG); requires 500–1500 nF capacitor to VSS for EMC immunity. |
| VREGA / VREG | Analog/Digital Supply Outputs | Provide regulated 2.5 V ±75 mV for sensor core and digital logic; each requires dedicated 1 μF ceramic capacitor to respective ground. |
| BUS_SW | Daisy-Chain Gate Driver | Drives gate of external N-channel MOSFET to enable VSS_OUT switching in multi-sensor daisy-chain configurations. |
| PCM | Test PCM Output | 4 MHz pulse-code modulated signal proportional to acceleration; enabled via OTP bit; must be left unconnected if unused. |
Key Features
| Feature | Design Value |
|---|---|
| PSI5 v1.3 Programmable Time Slots | 0.5 μs resolution allows precise time-slot assignment in multi-sensor networks, minimizing bus contention during crash events. |
| Two-Wire Programming Mode | Enables field reconfiguration of device settings (e.g., baud rate, data size, CRC) without SPI hardware, reducing system BOM cost. |
| Overdamped X-Axis MEMS Structure | Damping ratio 2.76–6.77 eliminates ringing in crash pulses, ensuring accurate peak-g detection critical for airbag deployment timing. |
| Self-Test Capability | Generates known mechanical stimulus (40 LSB @ ±120g range) to verify sensor integrity pre-deployment without external equipment. |
| Offset Cancellation with Fast Startup | HPF startup completes in ≤320 ms (Phase 1), enabling rapid system readiness after vehicle power-on. |
Applications
| Front Airbag Crash Detection | Side Impact Sensor |
|---|---|
Use Scenario: Mounted in vehicle dashboard to detect frontal collision events exceeding 10g within 10–30 ms. IC Role / Device Role / Timing Role: Primary X-axis acceleration transducer feeding real-time data to airbag control unit via PSI5 bus. Use Value: ±120g range and 400 Hz LPF reject road noise while preserving crash pulse fidelity; AEC-Q100 Grade 1 ensures reliability in harsh cabin environment. | Use Scenario: Integrated into door module to sense lateral acceleration during side collisions or rollover events. IC Role / Device Role / Timing Role: Satellite accelerometer providing synchronized timing-aligned data to central safety ECU via daisy-chained PSI5 network. Use Value: BUS_SW pin enables seamless daisy-chain topology with up to 32 nodes; 1 μs interpolation supports sub-millisecond timestamping accuracy. |
| Rollover Detection System | Pre-Crash Sensing Module |
Use Scenario: Mounted near vehicle center of gravity to monitor angular acceleration derivatives during aggressive maneuvers. IC Role / Device Role / Timing Role: High-bandwidth inertial sensor supplying raw acceleration data for roll-rate estimation algorithms. Use Value: 12.65 kHz g-cell natural frequency and 2.5 kHz rolloff avoid aliasing from suspension vibrations; low latency (<65 μs) enables real-time intervention. | Use Scenario: Embedded in forward radar housing to detect early-stage collision precursors (e.g., sudden deceleration of lead vehicle). IC Role / Device Role / Timing Role: Secondary acceleration monitor cross-checking radar-derived velocity changes for ASIL-D redundancy. Use Value: Dual error detection (even parity + 3-bit CRC) and OTP-configurable BAUD/BLANKTIME ensure fault-tolerant communication per ISO 26262. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar inertial sensor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| NXP MMA5224KWR2 | ±240g full-scale range; higher g-cell clipping limit (2065g); identical PSI5 interface and pinout. | Suitable for high-deceleration rear-impact or heavy-truck applications where ±120g is insufficient. | Select when crash pulse amplitudes exceed ±100g routinely; retains same PCB layout and firmware interface. |
| Infineon KMI16A | PSI5-compatible but analog output (0.5–4.5 V); no digital filtering or self-test; 8-pin SOIC package. | Used in legacy airbag systems requiring analog interface; lacks programmability and daisy-chain support. | Choose only for cost-sensitive designs without need for digital diagnostics or network scalability. |
Compared with MMA5224KWR2 and KMI16A, the MMA5212KWR2 offers optimal balance of dynamic range, digital intelligence, and automotive qualification for mainstream passenger vehicle front/side airbag systems-delivering deterministic PSI5 timing, built-in offset cancellation, and field-programmable configuration without layout changes.
Availability
MMA5212KWR2 is available at Aetrix Electronics and suitable for automotive safety systems, airbag control units, and rollover detection modules requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for MMA5212KWR2 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 automotive, industrial, and IoT applications, with deep expertise in sensor signal conditioning and functional safety.
The MMA52xxKW family was designed specifically for automotive crash sensing applications requiring PSI5 interface compliance, high EMC immunity, and ASIL-B ready architecture-targeting airbag, seatbelt pretensioner, and occupant classification systems.
FAQ
What is the full-scale range and sensitivity of the MMA5212KWR2?
The MMA5212KWR2 has a ±120g full-scale range with typical sensitivity of 4 LSB/g in 10-bit mode. Total sensitivity error is ±5% over temperature and supply voltage. Its g-cell structure is overdamped (damping ratio 2.76–6.77) to suppress resonance artifacts during crash events, and it features factory-trimmed offset cancellation for stable zero-g output.
Does the MMA5212KWR2 support daisy-chaining with other PSI5 sensors?
Yes, the MMA5212KWR2 supports optional daisy-chaining via its BUS_SW pin, which drives the gate of an external N-channel MOSFET to switch VSS_OUT. This enables multi-node PSI5 networks without additional wiring. Daisy-chain addressing uses programmable time slots with 0.5 μs resolution, and sync pulse blanking ensures reliable arbitration during initialization.
What are the supported PSI5 communication parameters for the MMA5212KWR2?
The MMA5212KWR2 supports PSI5 v1.3 with selectable baud rates of 125 kBaud or 190.5 kBaud, data lengths of 8 or 10 bits, and error detection via even parity or 3-bit CRC. It operates in synchronous or asynchronous mode, with programmable time slots and configurable blanking time. The internal oscillator runs at 4 MHz ±5%, directly governing all timing parameters.
How does the MMA5212KWR2 handle power supply transients common in automotive environments?
The MMA5212KWR2 tolerates VCC transients up to +25 V for <10 μs and survives reverse voltage down to -0.7 V. Its VBUF-regulated architecture isolates analog/digital supplies from VCC noise, and low-voltage detection thresholds (e.g., VCC_UV_F = 3.4–4.0 V) trigger safe shutdown before functional failure. External capacitors (2.2 nF on VCC, 1 μF on VREG/VREGA) are mandatory for transient suppression.
Can the MMA5212KWR2 be programmed after soldering to the PCB?
Yes, the MMA5212KWR2 supports two-wire programming mode over the PSI5 bus, allowing field updates to OTP registers (e.g., BAUD, DATASIZE, TIMESLOT) without SPI hardware. Programming requires applying VPP = 14 V to IDATA, issuing "Execute Programming of NVM" command, and verifying CRC. Once LOCK_U bit is set, further writes are disabled to prevent accidental corruption.
MMA5212KWR2 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:
- PCM, SPI
- Voltage - Supply:
- 4.2V ~ 17V
- Features:
- Selectable Low Pass Filter
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QFN (6x6)
MMA5212KWR2 FAQ
1.How can I place an order for MMA5212KWR2 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMA5212KWR2 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 MMA5212KWR2 reliable?
The price and inventory of MMA5212KWR2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMA5212KWR2 is usually 5 days.
3.What payment methods are accepted for MMA5212KWR2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMA5212KWR2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMA5212KWR2?
MMA5212KWR2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMA5212KWR2 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 MMA5212KWR2?
For technical support, including MMA5212KWR2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMA5212KWR2 requirements.
6.How does Aetrix verify that MMA5212KWR2 is sourced from the original manufacturer or authorized distributors?
All MMA5212KWR2 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 MMA5212KWR2 meets industry standards.
7.What is the process for return or replacement of MMA5212KWR2?
All MMA5212KWR2 units undergo pre-shipment inspection (PSI). If there is an issue with MMA5212KWR2, 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 MMA5212KWR2 part is unused and in its original packaging.
Return procedure for MMA5212KWR2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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