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NXP Semiconductors MMA6827BKCW
- Part No.:
- MMA6827BKCW
- Manufacturer:
- NXP Semiconductors
- Category:
- Accelerometers
- Package:
- -
- Datasheet:
-
MMA6827BKCW.pdf
- Description:
- MMA6827 - DUAL-AXIS SPI INERTIAL
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Product details
Overview
MMA6827BKCW from NXP Semiconductors is a dual-axis, SPI-interface, over-damped lateral accelerometer with ±120 g full-scale range on both X and Y axes, 10-bit digital output, and AEC-Q100 Grade 1 qualification 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 MMA6827BKCW datasheet, MMA6827BKCW pinout, MMA6827BKCW application, or MMA6827BKCW equivalent, this page delivers verified technical context, exact pin roles, automotive-grade timing behavior, offset cancellation performance, and real-world airbag system integration guidance - all grounded in NXP's Rev. 9.0 datasheet and SafeAssure functional safety framework.
Technical Context
The MMA6827BKCW integrates two independent over-damped MEMS g-cells (X/Y) with natural frequency 10.8–15.9 kHz and damping ratio 2.46–9.36, enabling robust shock survivability (±1500 g powered, ±2000 g unpowered). Its signal chain includes ΣΔ ADCs, SINC filters, configurable IIR low-pass filtering (4-pole/3-pole), and linear interpolation for output scaling.
Digital control is implemented via SPI interface (CS/SCLK/MOSI/MISO) with CRC-protected register access, OTP-trimmed calibration, and dual-mode arming outputs (ARM_X/ARM_Y) configurable as open-drain active-low/high or PCM outputs. Internal 2.5 V regulators (VREG/VREGA) power digital/analog domains separately, with dedicated decoupling requirements (C1/C2/C3).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Full-Scale Range | ±120 g on both X and Y axes - enables detection of high-deceleration crash events without saturation up to ±375 g internal ADC clipping limit. |
| Digital Output Resolution | 10-bit signed or unsigned SPI output - provides 4.096 LSB/g sensitivity at ±120 g range for precise acceleration quantization. |
| Low-Pass Filter Options | Twelve selectable cutoff frequencies (50–1000 Hz, 4-pole or 3-pole) - allows tuning noise rejection vs. response time for specific crash pulse profiles. |
| Offset Cancellation | Optional >6.29 s averaging period with <0.25 LSB/s slew rate - reduces long-term drift impact on zero-g baseline in harsh thermal environments. |
| Supply Voltage | 3.3 V or 5 V single supply - supports legacy 5 V automotive microcontrollers and modern 3.3 V domain interfaces without level-shifting. |
| Operating Temperature | AEC-Q100 Grade 1: –40 °C to +125 °C - validated for under-hood and passenger compartment mounting locations. |
| Package | Pb-free 16-pin QFN, 6 mm × 6 mm × 1.98 mm - surface-mount compatible with automated reflow and meets automotive vibration/shock requirements. |
Pinout & Package
Pb-free 16-pin QFN package, 6 mm × 6 mm × 1.98 mm footprint with exposed die attach pad (internally connected to VSS). Pin 1 marked by dot; bottom view shows VREGA–VSS–N/C–VSSA layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VREGA | Analog supply input | Provides regulated 2.5 V to analog circuitry; requires 1 μF ceramic capacitor to VSSA per datasheet Figure 1. |
| VSS / VSSA | Digital and analog ground | Separate ground returns prevent coupling noise between digital SPI and analog sensor paths; pins 2,4,13,16 must be connected to respective ground planes. |
| VCC | Main supply input | Accepts 3.135–5.25 V; requires 0.1 μF decoupling capacitor to VSS per Table 1. |
| ARM_X / ARM_Y | Configurable arming output | Open-drain outputs programmable as active-low/high arming signals or PCM outputs proportional to X/Y acceleration - directly drives airbag deployment logic. |
| SPI Interface (CS, SCLK, MOSI, MISO) | Serial peripheral interface | Standard 4-wire SPI with CRC-protected register access; tACCESS = 60 ns ensures compatibility with MCU SPI peripherals up to ~10 MHz clock. |
| 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, low-pass filter settings, self-test magnitudes, and arming thresholds - critical for asymmetric crash detection (e.g., frontal vs. side impact). |
| AEC-Q100 Grade 1 qualification | 100% final test at –40 °C to +105 °C ambient, with extended validation to +125 °C - ensures reliability in automotive safety-critical applications. |
| Over-damped MEMS structure | Damping ratio 2.46–9.36 and natural frequency >10.8 kHz eliminate resonance artifacts during crash pulses - delivers clean, interpretable acceleration waveforms for algorithmic decision-making. |
| Programmable arming logic | Multiple arming modes (moving average, count-based, unfiltered) with configurable thresholds per axis - enables flexible crash discrimination while minimizing false triggers. |
| Offset monitoring and correction | Real-time offset monitor with ±0.125 LSB threshold and automatic correction updates every ~1.05 ms - maintains accuracy across temperature and aging without host intervention. |
Applications
| Frontal Collision Detection | Side-Impact Sensing |
|---|---|
Use Scenario: Vehicle deceleration exceeding 20 g within 10–50 ms during head-on collision. IC Role / Device Role / Timing Role: Primary acceleration transducer feeding airbag control unit (ACU) with time-stamped 10-bit SPI data at ≥1 kHz effective sample rate. Use Value: ±120 g range prevents saturation during severe crashes; 400 Hz LPF option suppresses road noise while preserving crash pulse fidelity. | Use Scenario: Lateral acceleration >15 g during T-bone or pole impact. IC Role / Device Role / Timing Role: Dual-axis inertial sensor providing orthogonal X/Y acceleration vectors to ACU for impact direction and severity classification. Use Value: Independent Y-axis ±120 g range and programmable arming allow tailored response to side-impact dynamics distinct from frontal events. |
| Rollover Detection | Pre-Crash Sensing |
Use Scenario: Sustained lateral acceleration >8 g over 100–300 ms during vehicle rollover sequence. IC Role / Device Role / Timing Role: Safety-critical inertial reference for electronic stability control (ESC) and rollover mitigation algorithms. Use Value: Over-damped g-cell design avoids resonance-induced false positives; offset cancellation maintains baseline integrity during prolonged maneuvers. | Use Scenario: Early-stage crash signature detection (e.g., barrier contact, pedestrian impact) before peak deceleration. IC Role / Device Role / Timing Role: High-bandwidth sensor feeding predictive crash algorithms with sub-millisecond latency (tDataPath_8 = 33–36.5 μs). Use Value: Unfiltered arming mode activation delay ≤1.05 μs enables fastest possible trigger response; 1000 Hz LPF option preserves early crash rise-time information. |
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 |
|---|---|---|---|
| MMA6825BKCW | ±100 g / ±100 g full-scale range; identical package, SPI interface, and AEC-Q100 Grade 1 rating. | Lower range reduces margin for extreme crash events but improves resolution (4.883 LSB/g) vs. MMA6827BKCW (4.096 LSB/g). | Select when system-level crash testing confirms ±100 g suffices and higher sensitivity is prioritized over headroom. |
| MMA6823BKCW | ±120 g / ±60 g asymmetric range; same pinout, regulators, and arming architecture. | Optimized for applications where one axis requires high dynamic range (e.g., X = frontal, Y = lateral with lower expected g-levels). | Choose when mechanical packaging constraints or crash physics favor asymmetric range allocation between axes. |
Compared with MMA6827BKCW, MMA6825BKCW trades 20 g headroom for 0.787 LSB/g higher sensitivity, while MMA6823BKCW retains full X-axis range but halves Y-axis capability - both require no PCB changes but demand register reconfiguration for optimal arming thresholds and LPF selection.
Availability
MMA6827BKCW is available at Aetrix Electronics and suitable for automotive airbag control units, rollover detection modules, and pre-crash sensing systems requiring stable component supply, AEC-Q100 compliance, and functional safety traceability.
Supply support for MMA6827BKCW 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 specializing in secure connectivity solutions for automotive, industrial, and IoT applications, with deep expertise in sensor signal conditioning and functional safety.
The MMA68xx family is designed specifically for automotive occupant restraint systems, integrating SafeAssure functional safety features, AEC-Q100 qualification, and dual-axis over-damped MEMS architecture to meet ASIL-B requirements in airbag deployment controllers.
FAQ
What is the full-scale acceleration range of the MMA6827BKCW?
The MMA6827BKCW has a ±120 g full-scale range on both the X-axis and Y-axis, as confirmed in the Ordering Information table and Section 3.4 Electrical Characteristics of the NXP MMA68xx datasheet Rev. 9.0. This symmetric high-range capability is specifically intended for detecting severe crash events in automotive airbag systems without ADC saturation up to ±375 g internal clipping limits.
Does the MMA6827BKCW support both 3.3 V and 5 V supply voltages?
Yes, the MMA6827BKCW supports single-supply operation at either 3.3 V or 5 V, with specified operating ranges of +3.135 V to +3.45 V and +4.75 V to +5.25 V respectively. The device includes internal regulators (VREG/VREGA) that generate stable 2.5 V supplies for digital and analog domains, eliminating need for external voltage translation in mixed-voltage automotive ECUs.
How is the MMA6827BKCW qualified for automotive safety applications?
The MMA6827BKCW is qualified to AEC-Q100 Revision G, Grade 1 (–40 °C to +125 °C), with 100% final test at –40 °C to +105 °C ambient. It is part of NXP's SafeAssure solution portfolio, featuring CRC-protected registers, built-in self-test, offset monitoring, and over-damped MEMS design - all supporting ASIL-B compliance in airbag control units per ISO 26262.
What are the key differences between the MMA6827BKCW and MMA6826BKCW?
The MMA6827BKCW provides ±120 g / ±120 g full-scale range on both axes, whereas the MMA6826BKCW is rated for ±60 g / ±60 g. Both share identical 16-pin QFN package, SPI interface, AEC-Q100 Grade 1 qualification, and feature set. The MMA6827BKCW delivers double the dynamic range at the cost of reduced LSB/g sensitivity (4.096 vs. 8.192), making it suitable for higher-severity crash detection scenarios.
Can the ARM_X and ARM_Y pins on the MMA6827BKCW be used for purposes other than arming signals?
Yes - the ARM_X and ARM_Y pins are multifunctional and can be configured via the DEVCFG register as either open-drain arming outputs (active-low or active-high) or PCM digital outputs proportional to X/Y-axis acceleration data. When unused, they must remain unconnected per Table 2 Pin Description. Configuration is performed through writable registers $0E (ARMCFGX) and $0F (ARMCFGY) in the customer-accessible data array.
MMA6827BKCW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Type:
- -
- Axis:
- -
- Acceleration Range:
- -
- Sensitivity (LSB/g):
- -
- Sensitivity (mV/g):
- -
- Bandwidth:
- -
- Output Type:
- -
- Voltage - Supply:
- -
- Features:
- -
- Operating Temperature:
- -
- Grade:
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- Qualification:
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- Mounting Type:
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- Supplier Device Package:
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MMA6827BKCW FAQ
1.How can I place an order for MMA6827BKCW through Aetrix?
Please submit a Request for Quotation (RFQ) for MMA6827BKCW 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 MMA6827BKCW reliable?
The price and inventory of MMA6827BKCW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMA6827BKCW is usually 5 days.
3.What payment methods are accepted for MMA6827BKCW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMA6827BKCW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMA6827BKCW?
MMA6827BKCW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMA6827BKCW 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 MMA6827BKCW?
For technical support, including MMA6827BKCW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMA6827BKCW requirements.
6.How does Aetrix verify that MMA6827BKCW is sourced from the original manufacturer or authorized distributors?
All MMA6827BKCW 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 MMA6827BKCW meets industry standards.
7.What is the process for return or replacement of MMA6827BKCW?
All MMA6827BKCW units undergo pre-shipment inspection (PSI). If there is an issue with MMA6827BKCW, 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 MMA6827BKCW part is unused and in its original packaging.
Return procedure for MMA6827BKCW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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