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NXP Semiconductors MMA6827BKW
- Part No.:
- MMA6827BKW
- Manufacturer:
- NXP Semiconductors
- Category:
- Accelerometers
- Package:
- 16-QFN Exposed Pad
- Datasheet:
-
MMA6827BKW.pdf
- Description:
- ACCELEROMETER 120G SPI 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,882
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Product details
Overview
MMA6827BKW 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 programmable low-pass filter options.
For engineers reviewing the MMA6827BKW datasheet, MMA6827BKW pinout, MMA6827BKW application, or MMA6827BKW equivalent, this page provides verified technical context, AEC-Q100 qualified specifications, pin-level design meaning, automotive safety-critical use cases, and validated alternative part guidance.
Technical Context
The MMA6827BKW 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 response to high-slew crash events without resonance-induced false triggers. Its digital signal path includes ΣΔ ADCs, configurable SINC/IIR low-pass filters (50–1000 Hz), offset cancellation with >6.2 s averaging, and CRC-protected register access.
It implements dual independent arming logic with programmable thresholds and response modes (moving average, count, unfiltered), plus self-test capability with calibrated deflection (±21.37g to ±39.38g). All functions are monitored by voltage supervisors (VCC, VREG, VREGA) and integrated power-on reset with 10 ms recovery time.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Full-Scale Range | ±120g on both X and Y axes - enables detection of high-deceleration frontal/side crashes in airbag control units. |
| Digital Output Resolution | 10-bit signed or unsigned SPI data - provides 1024 discrete levels with zero-g at 0 or 512 LSB depending on SD bit setting. |
| Low-Pass Filter Options | 12 selectable cutoff frequencies (50 Hz to 1000 Hz, 3- or 4-pole) - allows tuning noise rejection vs. response latency per axis. |
| Supply Voltage | 3.3V or 5.0V single supply - supports legacy 5V automotive microcontrollers and modern 3.3V domains without level-shifting. |
| AEC-Q100 Qualification | Grade 2 (−40°C to +105°C ambient) - certified for under-hood and passenger compartment deployment in production vehicles. |
| Power Consumption | 4.0–9.0 mA typical - enables integration into always-on crash sensing subsystems with constrained power budgets. |
| Arming Output Flexibility | ARM_X/ARM_Y configurable as open-drain active-low/high or PCM output - supports direct interface to deployment ICs or MCU GPIOs. |
Pinout & Package
16-pin QFN package (6 mm × 6 mm, Case 2086-01), thermally enhanced with exposed die attach pad connected to VSS. Pin 17 (PAD) is internally tied to VSS and must be soldered to ground plane for thermal and EMI performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VREGA | Analog supply input | Provides regulated 2.5V for analog sensor front-end; requires 1 μF decoupling to VSSA per datasheet Figure 1. |
| VSS / VSSA | Digital and analog ground | Separate return paths prevent digital switching noise from corrupting analog measurements; VSSA pins (13,16) must connect to clean analog ground. |
| VREG | Digital supply input | Provides regulated 2.5V for digital core; requires 1 μF decoupling to VSS. |
| VCC | Main supply input | Accepts 3.3V or 5V; powers internal regulators and I/O; requires 0.1 μF decoupling to VSS. |
| ARM_X / ARM_Y | Configurable arming output | Programmable via DEVCFG register as open-drain fault indicator or PCM-encoded acceleration signal - no external pull-up needed in active-low mode. |
| SPI Interface (CS, SCLK, MOSI, MISO) | Serial communication | Standard 4-wire SPI with internal pull-up on CS and pull-downs on SCLK/MOSI; supports up to 8 MHz clock (tSCLK ≥ 120 ns). |
| TEST/VPP | Factory programming voltage | Must be tied to VSS in application; not user-accessible during normal operation. |
Key Features
| Feature | Design Value |
|---|---|
| Independent axis configuration | X and Y axes support separate full-scale ranges, filter settings, self-test magnitudes, and arming thresholds - critical for asymmetric vehicle crash dynamics. |
| Offset cancellation with slew limiting | Automatic correction using >6.2 s averaging and <0.25 LSB/s slew rate prevents drift-induced false alarms during long-term vehicle operation. |
| Robust fault monitoring | Integrated voltage supervisors (VCC_UV_f = 2.74 V, VREG_UVR_f = 1.764 V), CRC-protected registers, and offset monitor with programmable thresholds ensure functional safety compliance. |
| High shock survivability | Withstands powered shock up to ±1500g (0.5 ms) and unpowered shock up to ±2000g - exceeds automotive airbag system mechanical stress requirements. |
| Self-test with calibrated magnitude | Two-point self-test (low/high) provides traceable verification of sensor integrity and signal chain functionality without external equipment. |
Applications
| Frontal Crash Detection | Side-Impact Sensing |
|---|---|
|
Use Scenario: Detect rapid deceleration during head-on collisions to trigger airbag inflation within 20–30 ms. IC Role / Device Role / Timing Role: Primary inertial sensor providing real-time X-axis acceleration data to airbag control unit (ACU) with <37 μs datapath latency. Use Value: ±120g range and over-damped g-cell (ζ = 2.46–9.36) prevent resonance artifacts during high-frequency crash pulses, ensuring accurate trigger timing. |
Use Scenario: Monitor lateral acceleration during T-bone or pole impacts to deploy side airbags and curtain airbags. IC Role / Device Role / Timing Role: Dual-axis measurement source feeding Y-axis data to ACU; ARM_Y pin directly asserts deployment enable signal. Use Value: Independent Y-axis ±120g range and programmable 50–1000 Hz LPF allow optimization for side-impact frequency content while rejecting road noise. |
| Occupant Position Sensing | Crash Pulse Classification |
|
Use Scenario: Determine seat occupancy and occupant proximity to airbag module using low-g static tilt and dynamic motion cues. IC Role / Device Role / Timing Role: Secondary sensor providing low-noise, temperature-stable offset-corrected data for classification algorithms. Use Value: Offset cancellation with >6 s averaging and <0.25 LSB/s slew rate maintains baseline stability across thermal cycles and vehicle lifetime. |
Use Scenario: Distinguish between crash events (e.g., barrier impact) and non-crash shocks (e.g., potholes, braking) using spectral analysis of acceleration waveform. IC Role / Device Role / Timing Role: High-fidelity analog front-end feeding digitized waveform to host MCU for real-time FFT or feature extraction. Use Value: Twelve LPF options and 10-bit resolution enable adaptive filtering to isolate crash-relevant frequency bands (e.g., 150–500 Hz) while suppressing irrelevant noise. |
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 |
|---|---|---|---|
| ADXL312WBRDZ-RL | 3-axis, 13-bit output, I²C/SPI interface, ±1.5g to ±12g range - lacks ±120g capability and AEC-Q100 Grade 2 qualification. | Targeted at industrial vibration monitoring and consumer electronics, not automotive safety systems. | Select only for non-safety-critical prototyping; cannot replace MMA6827BKW in production airbag ECUs. |
| MMA8452QT | 3-axis, 12-bit output, I²C-only, ±2g/±4g/±8g range, built-in FIFO and motion detection - no arming outputs or high-g crash sensing capability. | Designed for eCall, rollover detection, and telematics; insufficient range and lack of safety-grade monitoring for airbag triggering. | Use where cost-sensitive, low-power motion awareness is needed - not suitable for primary crash sensing. |
Compared with ADXL312WBRDZ-RL and MMA8452QT, the MMA6827BKW uniquely delivers AEC-Q100 Grade 2 qualification, ±120g dual-axis range, dedicated arming outputs, and integrated offset cancellation - making it the only viable option for ASIL-B compliant airbag deployment systems requiring deterministic high-g event detection.
Availability
MMA6827BKW is available at Aetrix Electronics and suitable for automotive airbag control units, crash event data recorders, and occupant classification systems requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for MMA6827BKW 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 fusion, functional safety, and secure connectivity.
The MMA6827BKW belongs to NXP's SafeAssure portfolio of automotive-grade inertial sensors, engineered specifically for ASIL-B compliant airbag electronic control units requiring high reliability, diagnostic coverage, and crash pulse fidelity.
FAQ
What is the full-scale range specification for the MMA6827BKW?
The MMA6827BKW has a ±120g full-scale range on both the X-axis and Y-axis, as confirmed in the Ordering Information table of the Freescale MMA68xx datasheet Rev. 5. This range is factory-configured and fixed for this specific part number, enabling reliable detection of high-deceleration crash events required for airbag deployment decisions.
Does the MMA6827BKW support both 3.3V and 5V supply operation?
Yes, the MMA6827BKW supports single-supply operation at either 3.3V or 5.0V, as specified in Section 2.2 of the datasheet. Internal regulators generate stable 2.5V supplies for analog (VREGA) and digital (VREG) circuitry, eliminating need for external LDOs and simplifying power design in mixed-voltage automotive ECUs.
How is the MMA6827BKW qualified for automotive safety applications?
The MMA6827BKW is qualified to AEC-Q100 Revision G (May 2007) Grade 2, covering −40°C to +105°C ambient operation. It includes built-in diagnostics such as voltage supervisors, CRC-protected registers, offset monitoring, and self-test - all essential for ASIL-B compliance in airbag control systems per ISO 26262.
What interface protocol does the MMA6827BKW use, and what are its timing constraints?
The MMA6827BKW uses a 4-wire SPI interface (CS, SCLK, MOSI, MISO) with minimum SCLK period of 120 ns (max 8.33 MHz), as defined in Table 149 of the datasheet. It supports standard SPI modes and includes internal pull-up on CS and pull-downs on SCLK/MOSI, reducing external component count in automotive designs.
Can the MMA6827BKW's arming outputs be used without external components?
Yes, the ARM_X and ARM_Y pins are configurable as open-drain outputs with internal pull-up/pull-down current sources (IODPU = −100 to −50 μA, IODPD = 50–100 μA), allowing direct connection to deployment IC inputs or MCU GPIOs without external resistors - verified in Table 2 and Section 3.8.9 of the MMA68xx datasheet.
MMA6827BKW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 16-QFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Not For New Designs
- 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)
MMA6827BKW FAQ
1.How can I place an order for MMA6827BKW through Aetrix?
Please submit a Request for Quotation (RFQ) for MMA6827BKW 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 MMA6827BKW reliable?
The price and inventory of MMA6827BKW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMA6827BKW is usually 5 days.
3.What payment methods are accepted for MMA6827BKW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMA6827BKW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMA6827BKW?
MMA6827BKW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMA6827BKW 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 MMA6827BKW?
For technical support, including MMA6827BKW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMA6827BKW requirements.
6.How does Aetrix verify that MMA6827BKW is sourced from the original manufacturer or authorized distributors?
All MMA6827BKW 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 MMA6827BKW meets industry standards.
7.What is the process for return or replacement of MMA6827BKW?
All MMA6827BKW units undergo pre-shipment inspection (PSI). If there is an issue with MMA6827BKW, 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 MMA6827BKW part is unused and in its original packaging.
Return procedure for MMA6827BKW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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