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NXP Semiconductors MMA6827BKWR2
- Part No.:
- MMA6827BKWR2
- Manufacturer:
- NXP Semiconductors
- Category:
- Accelerometers
- Package:
- 16-QFN Exposed Pad
- Datasheet:
-
MMA6827BKWR2.pdf
- Description:
- ACCELEROMETER 120G SPI 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,754
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Product details
Overview
MMA6827BKWR2 from NXP Semiconductors (formerly Freescale) is a dual-axis, SPI-interface, over-damped lateral accelerometer with ±120g full-scale range on both X and Y axes, designed for automotive airbag deployment systems. It operates from 3.3V or 5V supply, delivers 10-bit signed/unsigned digital output via SPI, and features independent arming outputs and twelve selectable low-pass filter options (50–1000 Hz).
For engineers reviewing the MMA6827BKWR2 datasheet, MMA6827BKWR2 pinout, MMA6827BKWR2 application, or MMA6827BKWR2 equivalent, this page provides verified technical context, automotive-grade AEC-Q100 compliance details, pin-level functional roles, real-world airbag system integration guidance, and validated alternative part selection criteria.
Technical Context
The MMA6827BKWR2 integrates two over-damped silicon MEMS g-cells with natural frequency 10.8–15.9 kHz and damping ratio 2.46–9.36, enabling robust shock survivability (±2000g unpowered) and stable DC response. Its signal chain includes ΣΔ ADCs, programmable SINC + IIR low-pass filters, and independent offset cancellation with >6.2 s averaging period and <0.25 LSB/s slew rate.
Digital control is implemented via SPI interface (SCLK, MOSI, MISO, CS) with 120 ns minimum clock period and internal 8 MHz oscillator (±5% tolerance). Arming outputs (ARM_X/PCM_X and ARM_Y/PCM_Y) support configurable open-drain active-low/high modes or PCM-encoded acceleration data, synchronized to internal sampling timing with ≤6.6 μs assertion delay in unfiltered mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Full-Scale Range | ±120g on both X and Y axes - enables detection of high-deceleration crash events without saturation up to ±375g internal ADC clipping limit. |
| Digital Output Resolution | 10-bit signed or unsigned SPI output - provides 4.096 LSB/g sensitivity at ±120g range for precise acceleration quantization. |
| Low-Pass Filter Options | Twelve selectable cutoff frequencies (50–1000 Hz, 3- or 4-pole) - allows tuning for airbag algorithm latency vs. noise rejection trade-offs. |
| Supply Voltage | 3.3V or 5.0V single supply - supports legacy 5V automotive microcontrollers and modern 3.3V domains without level-shifting. |
| Operating Temperature | −40°C to +105°C ambient - qualified per AEC-Q100 Rev G for under-hood and passenger compartment placement. |
| Power Supply Monitor | VCC undervoltage threshold 2.74–3.02 V - ensures reliable reset and fault reporting during battery brownout conditions. |
| Shock Survival | ±2000g unpowered, 6-side, 0.5 ms - meets automotive mechanical ruggedness requirements for mounting near impact zones. |
Pinout & Package
Pb-free 16-pin QFN package (6 mm × 6 mm, case 2086-01), thermally enhanced with exposed die attach pad connected internally to VSS. Pin 17 (PAD) and corner pads are electrically tied to VSS for thermal and EMI performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VREGA | Analog supply input | Provides regulated 2.5 V (±0.08 V) to analog front-end; requires 1 μF ceramic capacitor to VSSA for stability. |
| VREG | Digital supply input | Provides regulated 2.5 V (±0.08 V) to digital core; requires 1 μF ceramic capacitor to VSS. |
| VCC | Main power supply | Accepts 3.135–5.25 V; powers internal regulators and I/O; requires 0.1 μF decoupling capacitor to VSS. |
| ARM_X / PCM_X | Configurable X-axis output | Open-drain arming output (active-low/high) or PCM-encoded acceleration data; pullup/pulldown current programmable. |
| ARM_Y / PCM_Y | Configurable Y-axis output | Functionally identical to ARM_X but for Y-axis; independently configurable via DEVCFG register. |
| SPI Interface (CS, SCLK, MOSI, MISO) | Serial communication interface | Standard 4-wire SPI with 120 ns min clock period; MISO valid within 60 ns after CS assertion; supports daisy-chain configuration. |
| VSS / VSSA | Digital and analog ground | Separate ground returns minimize noise coupling between digital switching and analog sensing paths. |
| TEST / VPP | Factory programming voltage | Must be tied to VSS in application; not used during normal operation or field programming. |
Key Features
| Feature | Design Value |
|---|---|
| Independent axis arming functions | Each axis (X/Y) has dedicated ARM pin with programmable activation thresholds, averaging windows, and polarity - enables dual-trigger airbag logic without external processing. |
| Twelve low-pass filter configurations | Four-pole filters at 50/150/200/400/500 Hz and three-pole at 200 Hz, plus 100/300/400/800/1000 Hz - supports algorithm-specific bandwidth matching for crash discrimination. |
| Offset cancellation with long averaging | 6.29 s averaging period and <0.25 LSB/s slew rate - eliminates thermal drift-induced false triggers while maintaining fast response to real crash events. |
| AEC-Q100 Grade 2 qualification | Qualified per AEC-Q100 Rev G (May 2007) - certified for automotive safety-critical applications including frontal and side-impact airbag deployment. |
| Over-damped MEMS architecture | Natural frequency 10.8–15.9 kHz and damping ratio 2.46–9.36 - suppresses resonance artifacts and ensures flat frequency response below 1 kHz for reliable crash pulse detection. |
Applications
| Frontal Crash Detection | Side-Impact 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 acceleration sensor feeding real-time data to airbag control unit (ACU) for deployment decision within ≤10 ms latency. Use Value: ±120g range captures high-speed crash pulses without clipping; 400 Hz LPF option balances noise rejection and response time for ISO 17361-compliant algorithms. |
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 inertial sensor providing orthogonal acceleration vectors to ACU for side-airbag and curtain-airbag triggering logic. Use Value: Independent X/Y full-scale ranges enable optimized sensitivity per axis; arming outputs allow hardware-level trigger generation before MCU intervention. |
| Occupant Position Sensing | Deployment Verification Monitoring |
|
Use Scenario: Used with seatbelt pretensioner systems to detect occupant proximity and posture prior to crash event. IC Role / Device Role / Timing Role: Low-noise, DC-stable accelerometer monitoring quasi-static seat position via offset-canceled output over extended periods. Use Value: Offset cancellation with >6 s averaging period maintains zero-g accuracy across temperature; 0.5 LSB RMS noise enables sub-50 mg resolution. |
Use Scenario: Embedded in airbag squib circuits to verify mechanical integrity and electrical continuity pre-deployment. IC Role / Device Role / Timing Role: Self-test capability (STMAG_X/Y) generates calibrated mechanical deflection to validate sensor path end-to-end. Use Value: Self-test output change of 21.37–39.38 g (±10°C to +105°C) provides traceable verification margin exceeding required test thresholds. |
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 |
|---|---|---|---|
| MMA6823BKWR2 | ±120g X-axis, ±60g Y-axis range; 8.192 LSB/g Y-sensitivity vs. 4.096 LSB/g for MMA6827BKWR2 | Optimized for asymmetric crash profiles where Y-axis requires higher resolution than X-axis (e.g., rollover + frontal hybrid systems) | Select when Y-axis resolution priority exceeds X-axis range symmetry; retains identical pinout, SPI interface, and AEC-Q100 qualification. |
| ADXL312WBRMZ-RL | 3-axis, 13-bit output, I²C/SPI interface; ±18g range (not ±120g); no arming outputs; 105°C max operating temp | Targeted at non-safety-critical vehicle dynamics (e.g., telematics, navigation) rather than airbag deployment | Use only for secondary sensing roles; lacks AEC-Q100 Grade 2 certification, arming functionality, and crash-range capability required for primary airbag sensors. |
Compared with MMA6823BKWR2 and ADXL312WBRMZ-RL, the MMA6827BKWR2 uniquely delivers matched ±120g dual-axis range with integrated arming outputs and AEC-Q100 Grade 2 qualification-making it the only direct fit for primary frontal/side airbag trigger applications requiring symmetrical high-g detection and hardware-level safety interlocks.
Availability
MMA6827BKWR2 is available at Aetrix Electronics and suitable for automotive airbag control units, occupant detection systems, and crash event recorders requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant traceability.
Supply support for MMA6827BKWR2 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 continues development of its automotive sensor portfolio, emphasizing functional safety, ASIL readiness, and AEC-Q100 reliability.
The MMA68xx family was engineered specifically for automotive safety-critical applications, with the MMA6827BKWR2 targeting primary airbag deployment systems requiring dual-axis ±120g sensing, hardware arming outputs, and robust shock survivability.
FAQ
What is the full-scale range specification for MMA6827BKWR2?
The MMA6827BKWR2 has a symmetric ±120g full-scale range on both the X-axis and Y-axis. This is confirmed in the Ordering Information table of the datasheet (Rev. 5, 03/2012), where MMA6827BKW and MMA6827BKWR2 are explicitly listed with X-Axis Range = ±120g and Y-Axis Range = ±120g. The device uses 10-bit digital output with 4.096 LSB/g sensitivity at this range.
Does MMA6827BKWR2 support both 3.3V and 5V supply operation?
Yes, the MMA6827BKWR2 supports single-supply operation at either 3.3V or 5.0V nominal voltage. Electrical Characteristics Table 2.2 specifies VL = +3.135 V and VH = +5.25 V for VCC, with typical operation at +3.3 V or +5.0 V. Internal regulators (VREG and VREGA) generate stable 2.5 V supplies regardless of input, ensuring consistent analog and digital performance across both supply rails.
What AEC-Q100 qualification level does MMA6827BKWR2 meet?
The MMA6827BKWR2 is qualified to AEC-Q100 Revision G (May 14, 2007), Grade 2, as stated in the "Referenced Documents" section of the datasheet. This certification covers temperature cycling, humidity testing, mechanical shock, and ESD (HBM ±2000 V), validating its suitability for automotive passenger compartment and under-hood applications with −40°C to +105°C operating ambient range.
How are the ARM_X and ARM_Y pins configured on MMA6827BKWR2?
The ARM_X/PCM_X and ARM_Y/PCM_Y pins on MMA6827BKWR2 are multifunctional and configured via the DEVCFG register's A_CFG[2:0] bits. They can operate as open-drain arming outputs (active-low or active-high with programmable pullup/pulldown current) or as PCM-encoded digital outputs proportional to acceleration. Configuration is independent per axis and requires no external components beyond optional pull-up resistors.
What is the purpose of the TEST/VPP pin on MMA6827BKWR2?
The TEST/VPP pin on MMA6827BKWR2 is reserved for factory programming of OTP registers during manufacturing and must be connected to VSS (ground) in all application circuits. It is not accessible or usable during normal operation, field programming, or calibration. Leaving it floating or applying voltage violates the Absolute Maximum Ratings and may damage the device.
MMA6827BKWR2 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:
- ±120g
- Sensitivity (LSB/g):
- 4.096
- 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)
MMA6827BKWR2 FAQ
1.How can I place an order for MMA6827BKWR2 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMA6827BKWR2 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 MMA6827BKWR2 reliable?
The price and inventory of MMA6827BKWR2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMA6827BKWR2 is usually 5 days.
3.What payment methods are accepted for MMA6827BKWR2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMA6827BKWR2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMA6827BKWR2?
MMA6827BKWR2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMA6827BKWR2 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 MMA6827BKWR2?
For technical support, including MMA6827BKWR2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMA6827BKWR2 requirements.
6.How does Aetrix verify that MMA6827BKWR2 is sourced from the original manufacturer or authorized distributors?
All MMA6827BKWR2 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 MMA6827BKWR2 meets industry standards.
7.What is the process for return or replacement of MMA6827BKWR2?
All MMA6827BKWR2 units undergo pre-shipment inspection (PSI). If there is an issue with MMA6827BKWR2, 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 MMA6827BKWR2 part is unused and in its original packaging.
Return procedure for MMA6827BKWR2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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