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NXP Semiconductors MMA6525KCWR2
- Part No.:
- MMA6525KCWR2
- Manufacturer:
- NXP Semiconductors
- Category:
- Accelerometers
- Package:
- 16-QFN Exposed Pad
- Datasheet:
-
MMA6525KCWR2.pdf
- Description:
- ACCELEROMETER 105G SPI 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,300
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Product details
Overview
MMA6525KCWR2 from NXP Semiconductors is a dual-axis, SPI-based, over-damped lateral accelerometer with ±105 g full-scale range on both X and Y axes, 12-bit digital output, and AEC-Q100 qualified for automotive airbag deployment systems. It operates from 3.3 V or 5 V supply, features twelve programmable low-pass filter options (50–1000 Hz), and supports independent arming functions per axis.
For engineers reviewing the MMA6525KCWR2 datasheet, MMA6525KCWR2 pinout, MMA6525KCWR2 application, or MMA6525KCWR2 equivalent, key selection criteria include its AEC-Q100 Grade 2 qualification, ±105 g dual-axis range, 12-bit signed/unsigned SPI output, offset cancellation capability (<0.25 LSB/s slew rate), and Pb-free 16-pin QFN (6 mm × 6 mm × 1.98 mm) package.
Technical Context
The MMA6525KCWR2 integrates two over-damped MEMS g-cells with natural frequency of 10.8–15.9 kHz and damping ratio of 2.46–9.36, enabling robust crash-sensing response without resonance artifacts. Its signal chain includes ΣΔ ADCs, configurable SINC + IIR low-pass filters, and independent digital processing paths for X and Y axes.
It implements SPI-compatible serial interface with 8 MHz internal oscillator (±5% tolerance), supports 12-bit data output in signed or unsigned format, and provides programmable arming outputs (ARM_X/ARM_Y) with open-drain configuration, pulldown/pullup current control, and fault-tolerant timing (activation delay <1.51 μs in unfiltered mode).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Full-Scale Range | ±105 g on both X and Y axes - enables detection of high-deceleration crash events required for front/side airbag triggering. |
| Digital Output Resolution | 12-bit signed or unsigned SPI output - provides 4096 discrete levels for precise acceleration quantization and thresholding. |
| Supply Voltage | 3.3 V or 5.0 V single supply - supports legacy 5 V automotive ECUs and modern 3.3 V microcontroller interfaces without level-shifting. |
| Low-Pass Filter Options | Twelve selectable cutoff frequencies (50–1000 Hz) - allows tuning filter bandwidth to match vehicle-specific crash pulse profiles and noise rejection needs. |
| Offset Cancellation | Optional averaging period >6.29 s with <0.25 LSB/s slew rate - ensures stable zero-g baseline under thermal drift and long-term aging in safety-critical deployments. |
| AEC-Q100 Qualification | Grade 2 (−40 °C to +105 °C ambient) - certifies operation across full automotive temperature range with verified reliability for airbag control units. |
| Package | Pb-free 16-pin QFN, 6 mm × 6 mm × 1.98 mm - surface-mount compatible with automated PCB assembly and meets automotive mechanical shock requirements (±1500 g powered shock). |
Pinout & Package
Pb-free 16-pin QFN package, 6 mm × 6 mm × 1.98 mm body with exposed die attach pad internally connected to VSS. Pin 1 is VREGA (analog supply); corner pads are internally tied to VSS.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VREGA | Analog supply input | Must be decoupled to VSSA with ≥1 μF X7R ceramic capacitor; powers analog sensor front-end and reference circuitry. |
| VSS, VSSA | Digital and analog ground returns | Separate ground planes required; VSSA must be routed directly to analog section to minimize noise coupling into g-cell signals. |
| VCC | Main power supply | Accepts 3.135–5.25 V; requires 0.1 μF decoupling capacitor to VSS per datasheet layout guidelines. |
| CS, SCLK, MOSI, MISO | SPI interface signals | Standard 4-wire SPI with internal pullup on CS and pulldowns on SCLK/MOSI; supports up to 8 MHz clock (tSCLK ≥120 ns). |
| ARM_X / ARM_Y | Configurable arming outputs | Open-drain outputs programmable as active-low/high arming triggers or PCM outputs; require external pullup/pulldown for logic-level definition. |
| TEST/VPP | Factory programming voltage | Must be connected to VSS in application; not used during normal operation or field programming. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-axis independent arming | Enables separate crash detection thresholds and timing for X (frontal) and Y (lateral) axes - critical for differentiated airbag deployment logic. |
| Twelve low-pass filter configurations | Allows matching filter group delay and bandwidth to specific vehicle crash pulse signatures - improves false-trigger immunity while preserving event fidelity. |
| Self-test with factory-trimmed deflection values | Provides traceable, calibrated self-test output (ΔST105_25 = 442–872 LSB) - satisfies ISO 26262 diagnostic coverage requirements for ASIL-B systems. |
| Offset monitoring with programmable thresholds | Monitors real-time offset drift against ±100 LSB thresholds and asserts fault flag if exceeded - enables continuous health checking without host CPU intervention. |
| Over-damped MEMS sensing element | Natural frequency 10.8–15.9 kHz with damping ratio >2.46 - eliminates resonant ringing during crash pulses, ensuring clean step-response for reliable trigger timing. |
Applications
| Frontal Crash Detection | Lateral Impact Sensing |
|---|---|
Use Scenario: Mounted in vehicle dashboard or center console to detect rapid deceleration during head-on collisions. IC Role / Device Role / Timing Role: Primary acceleration sensor feeding real-time g-data to airbag control unit (ACU) for deployment decision within ≤20 ms of crash onset. Use Value: ±105 g range and 400 Hz LPF option capture full crash pulse profile while rejecting road noise; over-damped response prevents false triggers from suspension bounce. | Use Scenario: Integrated into door modules or B-pillars to sense side-impact acceleration during T-bone or pole collisions. IC Role / Device Role / Timing Role: Dual-axis sensing enables vector magnitude calculation; ARM_Y output directly drives pyrotechnic squib enable line upon threshold exceedance. Use Value: Independent Y-axis arming function allows dedicated lateral thresholding; 12-bit resolution supports fine-grained calibration across vehicle variants. |
| Passenger Presence Verification | Seat Belt Pretensioner Activation |
Use Scenario: Used in conjunction with seat occupancy sensors to confirm occupant presence before airbag deployment. IC Role / Device Role / Timing Role: Detects low-level vibration and motion patterns (e.g., breathing, posture shifts) via high-resolution 12-bit output and low-noise floor (1 LSB RMS). Use Value: Offset cancellation and 50 Hz LPF option enable stable DC-coupled measurement of quasi-static occupant mass; reduces need for external signal conditioning. | Use Scenario: Mounted near seat belt retractor to detect sudden forward acceleration indicating pre-crash braking or initial impact. IC Role / Device Role / Timing Role: Provides early crash indication via fast ARM_X assertion (<1.51 μs delay) to initiate pretensioner firing before main airbag deployment. Use Value: Unfiltered mode activation and open-drain output allow direct connection to pretensioner driver ICs; eliminates software latency in safety-critical path. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-axis automotive accelerometer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMA6527KCWR2 | ±120 g full-scale range; higher sensitivity error (±5%) vs. MMA6525KCWR2 (±5%); identical pinout, package, and SPI interface. | Used where higher crash severity detection is required (e.g., heavy-duty vehicles); may require recalibration of arming thresholds due to increased range. | Select when system-level crash testing confirms need for >±105 g range; no PCB changes needed but firmware threshold updates required. |
| ADXL312WBRMZ-RL | 3-axis, 13-bit output, I²C/SPI interface; ±18 g range; not AEC-Q100 qualified; different package (16-pin LFCSP). | Targeted at non-safety-critical industrial or consumer motion sensing; lacks automotive qualification and dual-axis arming outputs. | Only suitable for prototyping or non-automotive applications; cannot replace MMA6525KCWR2 in ASIL-compliant airbag systems. |
Compared with MMA6527KCWR2, the MMA6525KCWR2 offers tighter alignment with standard passenger vehicle crash pulse envelopes and lower sensitivity error margin; compared with ADXL312WBRMZ-RL, it delivers certified functional safety compliance, dual-axis arming hardware, and automotive-grade thermal/EMC robustness essential for production airbag ECUs.
Availability
MMA6525KCWR2 is available at Aetrix Electronics and suitable for automotive airbag control units, occupant classification systems, and seat belt pretensioner modules requiring stable component supply, AEC-Q100 compliance, and long-term lifecycle support.
Supply support for MMA6525KCWR2 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 MMA65xx product line is designed specifically for automotive safety systems, delivering high-reliability, AEC-Q100 qualified inertial sensing with integrated diagnostics and hardware arming outputs for airbag and restraint control.
FAQ
What is the operating temperature range for the MMA6525KCWR2?
The MMA6525KCWR2 is qualified per AEC-Q100 Grade 2 with an operating ambient temperature range of −40 °C to +105 °C, verified by 100% final test. This range ensures reliable performance in under-hood and cabin-mounted automotive airbag control units where thermal extremes are common.
Does the MMA6525KCWR2 support both 3.3 V and 5 V supply voltages?
Yes, the MMA6525KCWR2 supports single-supply operation at either 3.3 V (3.135–3.45 V) or 5.0 V (4.75–5.25 V). Internal regulators (VREG, VREGA) generate stable 2.5 V analog/digital supplies regardless of input voltage, eliminating need for external LDOs in most designs.
How does the offset cancellation feature work in the MMA6525KCWR2?
The MMA6525KCWR2 implements optional offset cancellation with >6.29 s averaging period and <0.25 LSB/s slew rate. When enabled, it continuously measures and corrects zero-g offset in real time using internal registers (OFFCORR_X/Y), achieving residual offset <±0.25 LSB - critical for long-term stability in safety-critical deployments.
Can the ARM_X and ARM_Y pins be used for purposes other than arming outputs?
Yes, the ARM_X and ARM_Y pins are configurable via DEVCFG register as either open-drain arming outputs or PCM digital outputs proportional to X/Y-axis acceleration. In PCM mode, they deliver pulse-code modulated signals usable for analog-like monitoring without host SPI polling - reducing MCU interrupt load in resource-constrained ACUs.
What is the significance of the over-damped MEMS design in the MMA6525KCWR2?
The over-damped MEMS g-cells in the MMA6525KCWR2 have damping ratios of 2.46–9.36 and natural frequencies of 10.8–15.9 kHz. This eliminates resonant ringing during crash events, ensuring monotonic step response (<200 μs 0–90%) and accurate peak-g capture - essential for deterministic airbag deployment timing and avoidance of false triggers from suspension or drivetrain noise.
MMA6525KCWR2 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, Y
- Acceleration Range:
- ±105g
- Sensitivity (LSB/g):
- 18.2
- Sensitivity (mV/g):
- -
- Bandwidth:
- -
- Output Type:
- SPI
- Voltage - Supply:
- 3.135V ~ 5.25V
- 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)
MMA6525KCWR2 FAQ
1.How can I place an order for MMA6525KCWR2 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMA6525KCWR2 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 MMA6525KCWR2 reliable?
The price and inventory of MMA6525KCWR2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMA6525KCWR2 is usually 5 days.
3.What payment methods are accepted for MMA6525KCWR2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMA6525KCWR2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMA6525KCWR2?
MMA6525KCWR2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMA6525KCWR2 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 MMA6525KCWR2?
For technical support, including MMA6525KCWR2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMA6525KCWR2 requirements.
6.How does Aetrix verify that MMA6525KCWR2 is sourced from the original manufacturer or authorized distributors?
All MMA6525KCWR2 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 MMA6525KCWR2 meets industry standards.
7.What is the process for return or replacement of MMA6525KCWR2?
All MMA6525KCWR2 units undergo pre-shipment inspection (PSI). If there is an issue with MMA6525KCWR2, 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 MMA6525KCWR2 part is unused and in its original packaging.
Return procedure for MMA6525KCWR2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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