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NXP Semiconductors MMA6856BKCW
- Part No.:
- MMA6856BKCW
- Manufacturer:
- NXP Semiconductors
- Category:
- Accelerometers
- Package:
- 16-QFN Exposed Pad
- Datasheet:
-
MMA6856BKCW.pdf
- Description:
- XTRINSIC 10 BITS SPI ACCELEROMET
- Quantity:
- Payment:
- Shipping:
Inventory:1,182
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Product details
Overview
MMA6856BKCW from NXP Semiconductors is a single-axis, SPI-based, over-damped lateral accelerometer with ±60 g full-scale range, 10-bit digital output, and AEC-Q100 qualified operation for automotive airbag deployment systems. It operates from 3.3 V or 5 V supply, integrates programmable arming logic, and features 12 selectable low-pass filter cutoffs (50–1000 Hz).
For engineers reviewing the MMA6856BKCW datasheet, MMA6856BKCW pinout, MMA6856BKCW application, or MMA6856BKCW equivalent, this page delivers verified technical context, exact pin functions, automotive-grade timing behavior, offset cancellation performance, and validated alternative part selection guidance.
Technical Context
The MMA6856BKCW employs an over-damped silicon MEMS sensing element (natural frequency 10.8–15.9 kHz, damping ratio 2.46–9.36) with integrated ΣΔ ADC, SINC and IIR low-pass filtering, and on-chip voltage regulators (VREG = 2.50 V ±0.08 V, VREGA = 2.50 V ±0.08 V). Its signal chain supports both signed and unsigned 10-bit SPI output formats.
It implements configurable arming logic via the ARM/PCM pin-including moving average, count, and unfiltered modes-with activation delays as low as 0 μs (moving average) and 5.00 μs (unfiltered assertion), and includes factory-trimmed offset compensation with >6.29 s averaging period and <0.25 LSB/s slew rate.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Full-Scale Range | ±60 g - defines maximum measurable acceleration before saturation; matches airbag crash pulse detection requirements. |
| Digital Output Resolution | 10-bit signed or unsigned - provides 1024 discrete levels; sensitivity = 8.192 LSB/g at ±60 g range. |
| Supply Voltage | 3.3 V or 5.0 V single supply - dual-voltage compatibility simplifies integration into legacy and modern automotive ECUs. |
| Low-Pass Filter Options | 12 configurations (50–1000 Hz) - enables tuning of bandwidth vs. noise trade-off per system-level crash pulse profile. |
| Offset Cancellation | >6.29 s averaging period, <0.25 LSB/s slew rate - ensures stable zero-g calibration under thermal drift without overshoot. |
| AEC-Q100 Qualification | Grade 1 (–40 °C to +105 °C) - certified for under-hood and passenger compartment automotive safety applications. |
| Package | 16-pin QFN, 6 mm × 6 mm × 1.98 mm, Pb-free - surface-mount compatible with automated assembly and high-reliability reflow profiles. |
Pinout & Package
Pb-free 16-pin QFN package (6 mm × 6 mm × 1.98 mm) with exposed thermal pad internally connected to VSS. Pin 17 (PAD) is die attach flag; corner pads are internally tied to VSS.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VREGA (Pin 1) | Analog supply input | Provides regulated power to analog front-end; requires external 1 μF capacitor to VSSA for stability. |
| VSS / VSSA (Pins 2, 4, 13, 16) | Digital and analog ground returns | Separate ground paths prevent digital switching noise from corrupting analog sensor measurements. |
| VREG (Pin 3) | Digital supply input | Feeds internal digital regulator (2.50 V); requires 1 μF decoupling capacitor to VSS. |
| ARM/PCM (Pin 6) | Configurable output | Programmable as open-drain arming signal (active-high/low) or PCM data output; no pull-up/pull-down required when unused. |
| TEST/VPP (Pin 7) | Factory programming voltage | Must be tied to VSS in application; not used during normal operation. |
| MISO/MOSI/SCLK/CS (Pins 8, 10, 11, 12) | SPI interface signals | Standard 4-wire SPI with internal pull-up on CS and pull-downs on SCLK/MOSI; supports up to 8 MHz clock. |
| VCC (Pin 9) | Main supply input | Accepts 3.3 V or 5.0 V; requires 0.1 μF ceramic decoupling capacitor to VSS. |
Key Features
| Feature | Design Value |
|---|---|
| Over-damped lateral MEMS structure | Eliminates resonance-induced measurement error during high-slew crash events; damping ratio 2.46–9.36 ensures monotonic step response. |
| Programmable arming logic | Three operational modes (moving average, count, unfiltered) enable flexible crash decision thresholds without external logic. |
| On-chip offset cancellation | Automatically corrects long-term thermal drift using >6.29 s averaging window and controlled <0.25 LSB/s update slew rate. |
| 12 selectable low-pass filters | Independent 4-pole and 3-pole options (50–1000 Hz) allow precise matching to vehicle-specific crash pulse spectral content. |
| Self-test capability | Two calibrated deflection magnitudes (ΔSTLow = 10.68–18.75 g, ΔSTHI = 21.37–39.38 g) verify sensor functionality at power-on or runtime. |
Applications
| Frontal Crash Detection | Side-Impact Sensing |
|---|---|
|
Use Scenario: Detect rapid deceleration during head-on collision to trigger airbag inflation within 20–30 ms. IC Role / Device Role / Timing Role: Primary acceleration transducer feeding real-time crash algorithm in airbag control unit (ACU). Use Value: ±60 g range and 400 Hz LPF option capture critical 0–100 Hz crash pulse energy while rejecting road noise. |
Use Scenario: Monitor lateral acceleration during T-bone or side-swipe impact to deploy side-curtain and seat-mounted airbags. IC Role / Device Role / Timing Role: Single-axis X-direction inertial sensor mounted orthogonally to vehicle centerline. Use Value: Over-damped design prevents resonant ringing distortion during short-duration (<10 ms), high-peak (>30 g) side pulses. |
| Roll-Over Detection | Pre-Crash Sensing |
|
Use Scenario: Identify sustained lateral acceleration exceeding threshold during sharp turn or loss-of-control event. IC Role / Device Role / Timing Role: Safety-critical input to electronic stability control (ESC) and rollover mitigation systems. Use Value: AEC-Q100 Grade 1 qualification and –40 °C to +105 °C operating range ensure reliability in extreme environmental conditions. |
Use Scenario: Feed predictive crash algorithms by detecting early-stage braking or swerving maneuvers preceding impact. IC Role / Device Role / Timing Role: High-stability inertial reference for fusion with radar/camera inputs in ADAS domain controllers. Use Value: On-chip offset cancellation maintains <±0.25 LSB/s drift control over temperature and time, enabling accurate baseline tracking. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar single-axis automotive accelerometer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMA6853BKCW | ±50 g full-scale range; 9.766 LSB/g sensitivity; identical pinout, SPI interface, and AEC-Q100 qualification. | Lower range suits compact vehicles or systems requiring higher resolution below 50 g; reduced headroom for high-speed frontal crashes. | Select when system crash pulse analysis confirms peak acceleration remains ≤50 g; retains full software and layout compatibility. |
| MMA6855BKCW | ±120 g full-scale range; 4.096 LSB/g sensitivity; same package, regulators, and filter options. | Higher range accommodates heavy-duty trucks or high-speed collision scenarios; lower LSB/g reduces quantization resolution at low g. | Choose for applications demanding extended overload margin beyond 60 g; verify signal-to-noise ratio meets minimum threshold at target g-levels. |
Compared with MMA6856BKCW, MMA6853BKCW offers finer resolution below 50 g but less headroom, while MMA6855BKCW provides robust overload tolerance at the cost of reduced low-g sensitivity-both share identical timing, power, and functional architecture.
Availability
MMA6856BKCW 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 long-term production continuity.
Supply support for MMA6856BKCW 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 safety-critical system integration.
The MMA685x family is designed specifically for automotive occupant restraint systems, delivering SafeAssure-certified performance, integrated diagnostics, and robust mechanical design for airbag deployment decision-making.
FAQ
What is the full-scale range and sensitivity of the MMA6856BKCW?
The MMA6856BKCW has a ±60 g full-scale range and a digital sensitivity of 8.192 LSB/g for 10-bit unsigned output. This value is factory-trimmed and specified across temperature (–40 °C to +105 °C) and supply voltage (3.135 V to 5.25 V). The MMA6856BKCW achieves this sensitivity through internal scaling and ΣΔ conversion optimized for its designated range.
Does the MMA6856BKCW support both 3.3 V and 5 V supply operation?
Yes, the MMA6856BKCW supports single-supply operation at either 3.3 V (±3.135 V to ±3.45 V) or 5.0 V (±4.75 V to ±5.25 V), with all I/O thresholds and regulator outputs scaled accordingly. Internal VREG and VREGA outputs remain stable at 2.50 V ±0.08 V regardless of VCC choice, ensuring consistent analog and digital performance for the MMA6856BKCW.
How does the offset cancellation function work in the MMA6856BKCW?
The MMA6856BKCW performs continuous offset cancellation using a >6.29 s averaging period and limits correction slew rate to <0.25 LSB/s. This prevents overshoot during thermal transients and ensures stable zero-g tracking over temperature and time. The feature is enabled via the OFMON bit in DEVCFG and operates independently of user-triggered self-test sequences in the MMA6856BKCW.
What AEC-Q100 grade and test conditions apply to the MMA6856BKCW?
The MMA6856BKCW is qualified to AEC-Q100 Revision G, Grade 1, with operating ambient temperature from –40 °C to +105 °C, verified by 100% final test. It meets stress tests including powered shock (±1500 g), unpowered shock (±2000 g), and ESD (HBM ±2000 V), confirming suitability for automotive safety-critical deployment in the MMA6856BKCW's intended use cases.
Can the ARM/PCM pin on the MMA6856BKCW be used for both arming output and PCM data?
Yes-the ARM/PCM pin (Pin 6) is configurable via A_CFG[2:0] bits in DEVCFG_X. It can operate as an open-drain arming output (active-high or active-low with pulldown/pullup current) or as a PCM digital output proportional to acceleration. Configuration is mutually exclusive; the MMA6856BKCW does not support simultaneous arming and PCM functions on this pin.
MMA6856BKCW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 16-QFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Type:
- Digital
- Axis:
- X
- Acceleration Range:
- ±60g
- Sensitivity (LSB/g):
- 8.192
- 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)
MMA6856BKCW FAQ
1.How can I place an order for MMA6856BKCW through Aetrix?
Please submit a Request for Quotation (RFQ) for MMA6856BKCW 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 MMA6856BKCW reliable?
The price and inventory of MMA6856BKCW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMA6856BKCW is usually 5 days.
3.What payment methods are accepted for MMA6856BKCW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMA6856BKCW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMA6856BKCW?
MMA6856BKCW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMA6856BKCW 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 MMA6856BKCW?
For technical support, including MMA6856BKCW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMA6856BKCW requirements.
6.How does Aetrix verify that MMA6856BKCW is sourced from the original manufacturer or authorized distributors?
All MMA6856BKCW 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 MMA6856BKCW meets industry standards.
7.What is the process for return or replacement of MMA6856BKCW?
All MMA6856BKCW units undergo pre-shipment inspection (PSI). If there is an issue with MMA6856BKCW, 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 MMA6856BKCW part is unused and in its original packaging.
Return procedure for MMA6856BKCW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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