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NXP Semiconductors MMA6813BKWR2
- Part No.:
- MMA6813BKWR2
- Manufacturer:
- NXP Semiconductors
- Category:
- Accelerometers
- Package:
- 16-QFN Exposed Pad
- Datasheet:
-
MMA6813BKWR2.pdf
- Description:
- ACCELEROMETER 50G SPI 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,848
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Product details
Overview
MMA6813BKWR2 from NXP Semiconductors (formerly Freescale) is a dual-axis, SPI-interface, over-damped lateral accelerometer engineered for automotive airbag deployment systems. It delivers ±50g full-scale range on both X and Y axes, operates from 3.3V or 5V single supply, provides 10-bit signed/unsigned digital output, and supports twelve programmable low-pass filter options up to 1000 Hz.
For engineers reviewing the MMA6813BKWR2 datasheet, MMA6813BKWR2 pinout, MMA6813BKWR2 application, or MMA6813BKWR2 equivalent, this page provides verified technical context, AEC-Q100 Grade 1 compliance details, arming output configuration guidance, offset cancellation behavior, and validated alternatives for airbag sensor system design.
Technical Context
The MMA6813BKWR2 integrates two independent over-damped silicon MEMS g-cells with natural frequency 10.8–15.9 kHz and damping ratio 2.46–9.36, enabling robust crash-signal detection without resonance artifacts. Its digital signal path includes ΣΔ ADCs, SINC filters, and configurable IIR low-pass filtering - selectable per axis across 12 cutoff frequencies (50 Hz to 1000 Hz).
It features dual independent arming outputs (ARM_X/PCM_X and ARM_Y/PCM_Y), each configurable as open-drain active-low/high or PCM output, with sub-microsecond activation delay (<1.05 μs). Internal voltage regulators (VREG = 2.50 V ±0.08 V, VREGA = 2.50 V ±0.08 V) isolate analog and digital domains, and power-on recovery completes within 10 ms.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Full-Scale Range | ±50g on both X and Y axes - enables precise crash pulse discrimination in front/side impact detection. |
| Digital Output Resolution | 10-bit signed or unsigned SPI output - provides 1024 discrete levels with zero-g at 0 or 512 LSB respectively. |
| Sensitivity (X/Y) | 9.766 LSB/g (X), 9.766 LSB/g (Y) - calibrated at 100 Hz with 1000 Hz LPF; supports accurate g-level quantization. |
| Low-Pass Filter Options | 12 selectable cutoffs (50–1000 Hz, 3- or 4-pole) - allows tuning response time vs. noise rejection per axis. |
| Offset Cancellation | Optional >6.29 s averaging period with <0.25 LSB/s slew rate - reduces long-term drift in safety-critical deployments. |
| Supply Voltage | 3.3 V or 5.0 V single supply - compatible with legacy 5V automotive microcontrollers and modern 3.3V SoCs. |
| AEC-Q100 Qualification | Grade 1 (−40°C to +105°C ambient) - validated for under-hood and passenger compartment airbag control units. |
Pinout & Package
Pb-Free 16-pin QFN package, 6 mm × 6 mm, exposed thermal pad (Case 2086-01), RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Primary power supply input | Accepts 3.3 V or 5.0 V; requires 0.1 μF decoupling capacitor to VSS per datasheet Figure 1. |
| VREG | Digital regulator output supply | Internally regulated 2.50 V ±0.08 V for digital circuitry; requires 1 μF capacitor to VSS. |
| VREGA | Analog regulator output supply | Internally regulated 2.50 V ±0.08 V for analog front-end; requires 1 μF capacitor to VSSA. |
| VSS / VSSA | Digital and analog ground returns | Separate ground pins prevent noise coupling; VSSA must be star-grounded near sensor die. |
| CS, SCLK, MOSI, MISO | SPI interface signals | Standard 4-wire SPI (mode 0, CPOL=0, CPHA=0); tSCLK min = 120 ns, tACCESS max = 60 ns. |
| ARM_X / ARM_Y | Configurable arming outputs | Open-drain outputs supporting active-low/high polarity or PCM mode; <1.05 μs assertion time at 200 μA load. |
| TEST/VPP | Factory programming voltage | Must be tied to VSS in application; not user-accessible during normal operation. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-axis independent full-scale selection | Enables asymmetric crash detection tuning - e.g., ±50g X for frontal, ±50g Y for side impact - without hardware change. |
| Twelve programmable low-pass filter configurations | Per-axis filter selection (50–1000 Hz) allows optimizing bandwidth vs. noise for specific vehicle structures and mounting locations. |
| Independent arming logic per axis | Reduces false triggers by enabling separate acceleration thresholds, moving-average window lengths, and fault response per axis. |
| On-chip offset cancellation with long averaging | 6.29 s averaging period suppresses thermal drift and aging effects critical for 15+ year automotive service life. |
| Self-test capability with cross-axis verification | Validates mechanical integrity and signal chain end-to-end; includes cross-axis output monitoring to detect misalignment. |
Applications
| Frontal Collision Detection | Side-Impact Occupant Sensing |
|---|---|
|
Use Scenario: Mounted on vehicle firewall or instrument panel to detect rapid deceleration during head-on collisions. IC Role / Device Role / Timing Role: Primary inertial trigger for airbag ECU; provides real-time acceleration data with <37 μs datapath latency (LPF 0–5). Use Value: ±50g range matches typical frontal crash pulse profiles; over-damped g-cell avoids resonance-induced false triggers above 10 kHz. |
Use Scenario: Integrated into door modules or B-pillars to sense lateral acceleration during T-bone or side-swipe impacts. IC Role / Device Role / Timing Role: Dual-axis sensing node feeding side-airbag controller; ARM_Y output directly asserts deployment enable line. Use Value: Independent Y-axis arming with programmable threshold eliminates reliance on host MCU polling, reducing system latency. |
| Occupant Position Classification | Crash Pulse Shape Discrimination |
|
Use Scenario: Used with seat-track sensors to classify occupant mass and position for adaptive airbag deployment. IC Role / Device Role / Timing Role: Secondary acceleration reference for ECU algorithms; provides high-fidelity 10-bit waveform capture at 400 Hz LPF. Use Value: 0.5 LSB RMS noise (400 Hz, 4-pole LPF) enables reliable differentiation between adult/child seating postures. |
Use Scenario: Deployed in black-box event recorders to capture pre-crash and crash-phase acceleration signatures. IC Role / Device Role / Timing Role: High-integrity inertial recorder; stores timestamped 10-bit samples via SPI to external flash memory. Use Value: 12 LPF options allow matching filter response to regulatory pulse shape requirements (FMVSS 208, ECE R94). |
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 |
|---|---|---|---|
| MMA6826BKWR2 | ±60g/±60g full-scale range; identical pinout, SPI interface, and AEC-Q100 Grade 1 qualification. | Better suited for higher-g crash environments (e.g., heavy-duty vehicles) where ±50g margin is insufficient. | Select when system-level crash testing requires extended dynamic range without changing PCB layout or firmware register maps. |
| ADXL312WBRMZ-RL | 3-axis, 13-bit output, I²C/SPI interface; ±1.5g to ±12g range; no integrated arming outputs or offset cancellation. | Targeted at non-safety ADAS subsystems (e.g., rollover detection, navigation aiding) - not AEC-Q100 qualified for airbag use. | Consider only for non-safety applications requiring higher resolution or 3-axis data; not a drop-in replacement for airbag deployment. |
Compared with MMA6813BKWR2, MMA6826BKWR2 extends full-scale range while preserving all safety-critical features and pin compatibility, whereas ADXL312WBRMZ-RL offers higher resolution but lacks AEC-Q100 qualification, arming outputs, and automotive-grade offset stability - limiting it to non-safety roles.
Availability
MMA6813BKWR2 is available at Aetrix Electronics and suitable for automotive airbag control units, occupant classification systems, and crash-data recorders requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant traceability.
Supply support for MMA6813BKWR2 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 acquired Freescale in 2015 and maintains full product continuity, documentation, and qualification for the MMA68xx family.
The MMA68xx series was designed specifically for automotive safety-critical inertial sensing, emphasizing functional safety (ISO 26262-ready architecture), AEC-Q100 Grade 1 reliability, and deterministic arming response in airbag electronic control units.
FAQ
What is the operating temperature range for the MMA6813BKWR2?
The MMA6813BKWR2 is qualified to AEC-Q100 Grade 1, with a verified operating ambient temperature range of −40°C to +105°C. This range is confirmed by 100% final test and applies to all electrical and sensor specifications including sensitivity, offset, and arming output timing. The device remains fully functional across this range without derating.
Does the MMA6813BKWR2 support both signed and unsigned SPI output formats?
Yes, the MMA6813BKWR2 supports both signed and unsigned 10-bit SPI output formats. The SD bit in the DEVCFG register controls this: when set to '1', output is unsigned (zero-g = 512 LSB); when cleared, output is signed (zero-g = 0 LSB). This flexibility simplifies integration with host MCUs that expect either format without external scaling.
How is the offset cancellation feature implemented in the MMA6813BKWR2?
The MMA6813BKWR2 implements offset cancellation via a dedicated on-chip algorithm with >6.29 s averaging period and <0.25 LSB/s slew rate. It updates correction values every 1.049 ms, applying ±0.25 LSB increments/decrements until offset monitor thresholds (±100 LSB) are satisfied. This ensures slow, stable drift compensation without introducing step artifacts in safety-critical outputs.
Can the ARM_X and ARM_Y pins be used simultaneously for independent arming decisions?
Yes, the MMA6813BKWR2 supports fully independent arming logic on ARM_X and ARM_Y. Each pin can be configured via ARMCFGX/ARMCFGY registers for different moving-average window lengths, threshold levels, and assertion polarities. This enables simultaneous but distinct crash detection on orthogonal axes - for example, triggering driver airbag on X-axis exceedance and side curtain on Y-axis exceedance.
Is the MMA6813BKWR2 pin-compatible with other devices in the MMA68xx family?
Yes, all MMA68xx variants - including MMA6813BKWR2, MMA6826BKWR2, and MMA6821BKWR2 - share identical 16-pin QFN-6×6 package (Case 2086-01) and pinout. Register mapping, SPI protocol, and arming output behavior are consistent across the family, enabling hardware reuse when scaling full-scale range or adjusting Y-axis sensitivity.
MMA6813BKWR2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 16-QFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Digital
- Axis:
- X, Y
- Acceleration Range:
- ±50g
- Sensitivity (LSB/g):
- 9.766
- Sensitivity (mV/g):
- -
- Bandwidth:
- -
- Output Type:
- SPI
- Voltage - Supply:
- 3.135V ~ 5.25V
- Features:
- -
- Operating Temperature:
- -40°C ~ 105°C
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QFN (6x6)
MMA6813BKWR2 FAQ
1.How can I place an order for MMA6813BKWR2 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMA6813BKWR2 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 MMA6813BKWR2 reliable?
The price and inventory of MMA6813BKWR2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMA6813BKWR2 is usually 5 days.
3.What payment methods are accepted for MMA6813BKWR2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMA6813BKWR2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMA6813BKWR2?
MMA6813BKWR2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMA6813BKWR2 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 MMA6813BKWR2?
For technical support, including MMA6813BKWR2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMA6813BKWR2 requirements.
6.How does Aetrix verify that MMA6813BKWR2 is sourced from the original manufacturer or authorized distributors?
All MMA6813BKWR2 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 MMA6813BKWR2 meets industry standards.
7.What is the process for return or replacement of MMA6813BKWR2?
All MMA6813BKWR2 units undergo pre-shipment inspection (PSI). If there is an issue with MMA6813BKWR2, 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 MMA6813BKWR2 part is unused and in its original packaging.
Return procedure for MMA6813BKWR2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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