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NXP Semiconductors MMA6856BKCWR2
- Part No.:
- MMA6856BKCWR2
- Manufacturer:
- NXP Semiconductors
- Category:
- Accelerometers
- Package:
- 16-QFN Exposed Pad
- Datasheet:
-
MMA6856BKCWR2.pdf
- Description:
- XTRINSIC 10 BITS SPI ACCELEROMET
- Quantity:
- Payment:
- Shipping:
Inventory:2,254
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Product details
Overview
MMA6856BKCWR2 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 12 programmable low-pass filter options (50–1000 Hz), and features offset cancellation with >6 s averaging period and <0.25 LSB/s slew rate.
For engineers reviewing the MMA6856BKCWR2 datasheet, MMA6856BKCWR2 pinout, MMA6856BKCWR2 application, or MMA6856BKCWR2 equivalent, this page delivers verified technical context, validated pin functions, automotive-grade timing and noise specs, and real-world deployment guidance for crash-sensing systems requiring functional safety compliance.
Technical Context
The MMA6856BKCWR2 implements an over-damped silicon MEMS sensing element (natural frequency 10.8–15.9 kHz, damping ratio 2.46–9.36) coupled to a ΣΔ ADC and configurable SINC/IIR digital filter chain. Its internal 8 MHz oscillator feeds a programmable clock divider to support 12 discrete LPF cutoffs across two sampling modes (64/fOSC and 128/fOSC).
Digital functionality includes SPI register access to configuration registers (DEVCFG, DEVCFG_X, ARMCFG), arming logic with moving-average/count/unfiltered modes, self-test control (STMAG-selectable), and offset monitoring with programmable thresholds. All critical paths are monitored via voltage supervisors (VCC_UV_f = 2.74 V, VREG_UVR_f = 1.764 V) and CRC-protected register arrays.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Full-Scale Range | ±60 g - defines maximum measurable acceleration before saturation (gADC_Clip = ±375 g) or mechanical clipping (ggcell_Clip = ±500 g) |
| Digital Output Resolution | 10-bit signed/unsigned - provides 0–1023 (unsigned) or –512 to +511 (signed) codes; sensitivity = 8.192 LSB/g |
| Supply Voltage | 3.3 V or 5.0 V - dual-rail compatibility enables integration into legacy 5 V and modern 3.3 V automotive ECUs |
| Low-Pass Filter Options | 12 selectable cutoffs (50–1000 Hz) - supports tuning for airbag deployment timing vs. noise rejection trade-offs |
| Offset Cancellation | >6.29 s averaging period, <0.25 LSB/s slew rate - ensures stable zero-g baseline under thermal drift without overshoot |
| Operating Temperature | –40 °C to +105 °C - fully qualified across automotive cabin and under-hood ambient conditions |
| AEC-Q100 Grade | Grade 2 (–40 °C to +105 °C) - certified per Revision G for safety-critical airbag sensor applications |
Pinout & Package
Pb-free 16-pin QFN package, 6 mm × 6 mm × 1.98 mm, with exposed die attach pad internally connected to VSS.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VREGA | Analog supply input | Power for analog front-end; requires 1 μF ceramic capacitor to VSSA per datasheet Figure 1 |
| VSS / VSSA | Digital/analog ground | Separate return paths prevent coupling between digital switching noise and analog signal chain |
| VREG | Digital regulator output | Internally regulated 2.5 V supply for digital core; decoupled with 1 μF capacitor to VSS |
| VCC | Main power input | 3.3 V or 5 V primary supply; requires 0.1 μF decoupling capacitor to VSS |
| ARM/PCM | Configurable output | Programmable as open-drain arming signal (active-high/low) or PCM output proportional to acceleration |
| TEST/VPP | Factory programming voltage | Must be tied to VSS in application; not user-accessible during normal operation |
| SPI Interface (CS, SCLK, MOSI, MISO) | Serial communication | Standard 4-wire SPI interface with internal pullup on CS and pulldowns on SCLK/MOSI; supports up to 8 MHz clock |
Key Features
| Feature | Design Value |
|---|---|
| Over-damped MEMS architecture | Eliminates resonance-induced measurement errors during high-slew crash events (damping ratio 2.46–9.36) |
| Programmable arming logic | Three operational modes (moving average, count, unfiltered) enable flexible crash decision thresholds without external processing |
| Offset monitor with fault reporting | Detects out-of-range zero-g offset (>±100 LSB) and asserts status flag in DEVSTAT register for system-level diagnostics |
| Self-test with magnitude selection | Two calibrated deflection levels (ΔSTLow = 10.68–18.75 g, ΔSTHI = 21.37–39.38 g) verify sensor integrity pre-deployment |
| Power supply supervision | Independent undervoltage/overvoltage monitors on VCC, VREG, and VREGA with hysteresis ensure reliable reset behavior |
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 X-axis inertial sensor providing real-time acceleration data to airbag control unit (ACU) via SPI. Use Value: ±60 g range and 400 Hz LPF option deliver optimal signal-to-noise ratio and response latency for ISO 27958-compliant frontal crash algorithms. |
Use Scenario: Monitor lateral acceleration during T-bone or side-swipe impacts to activate side-curtain and seat-mounted airbags. IC Role / Device Role / Timing Role: Single-axis lateral accelerometer mounted orthogonally to vehicle Y-axis, interfacing directly with ACU over SPI. Use Value: Over-damped design prevents resonance artifacts at 100–200 Hz, enabling accurate discrimination of side-impact vs. road noise using 150–200 Hz LPF settings. |
| Roll-Over Detection | Pre-Crash System Input |
Use Scenario: Detect sustained lateral acceleration exceeding threshold for vehicle roll dynamics prediction in SUVs and light trucks. IC Role / Device Role / Timing Role: Safety-critical sensor feeding roll-angle estimation algorithm in electronic stability control (ESC) module. Use Value: AEC-Q100 Grade 2 qualification and –40 °C to +105 °C operation ensure reliability during extended exposure to underbody thermal cycling. |
Use Scenario: Provide early acceleration signature to pre-crash systems for automatic braking, belt pretensioning, and seat position adjustment. IC Role / Device Role / Timing Role: High-integrity inertial input to ADAS domain controller, synchronized via SPI with timestamped data packets. Use Value: Programmable arming output (ARM/PCM) enables direct hardware-level trigger to pre-crash actuation circuits without MCU intervention. |
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 |
|---|---|---|---|
| MMA6853BKCWR2 | ±50 g full-scale range; 9.766 LSB/g sensitivity; identical pinout, SPI interface, and AEC-Q100 qualification | Better resolution for lower-g crash events but reduced headroom for high-speed frontal impacts | Select when system-level crash modeling indicates peak acceleration remains below ±50 g under worst-case NCAP scenarios |
| MMA6855BKCWR2 | ±120 g full-scale range; 4.096 LSB/g sensitivity; same package, register map, and filtering architecture | Lower resolution per g but higher mechanical robustness for rollover or heavy-truck applications | Choose for applications requiring margin against mechanical clipping (ggcell_Clip = ±500 g) in extreme deceleration environments |
Compared with MMA6853BKCWR2 and MMA6855BKCWR2, the MMA6856BKCWR2 offers balanced range and resolution for mainstream passenger vehicle airbag systems-providing sufficient headroom above typical 40–50 g NCAP test peaks while maintaining adequate quantization granularity for precise threshold detection.
Availability
MMA6856BKCWR2 is available at Aetrix Electronics and suitable for automotive airbag control units, electronic stability control modules, and pre-crash safety systems requiring stable component supply, AEC-Q100 compliance, and long-term production continuity.
Supply support for MMA6856BKCWR2 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 functional safety and ASIL-compliant sensor interfaces.
The MMA685x family-including MMA6856BKCWR2-is designed specifically for automotive occupant restraint systems, delivering SafeAssure-certified performance, integrated diagnostics, and robust MEMS sensing tailored to airbag deployment timing requirements.
FAQ
What is the full-scale range and sensitivity of the MMA6856BKCWR2?
The MMA6856BKCWR2 has a ±60 g full-scale range and a digital sensitivity of 8.192 LSB/g for 10-bit unsigned output. This corresponds to a nominal zero-g code of 512 and a full-scale code span of 0–1023. Sensitivity error is ±5% over temperature (–40 °C to +105 °C), and the device maintains linearity within ±1% FSR across its operating range.
Does the MMA6856BKCWR2 support both 3.3 V and 5 V supply operation?
Yes, the MMA6856BKCWR2 supports single-supply operation at either 3.3 V (±3.135–3.45 V) or 5.0 V (±4.75–5.25 V). Internal regulators generate stable 2.5 V supplies for analog (VREGA) and digital (VREG) domains. Power supply monitors validate VCC, VREG, and VREGA levels independently to ensure safe startup and fault detection.
How is the ARM/PCM pin configured on the MMA6856BKCWR2?
The ARM/PCM pin on the MMA6856BKCWR2 is software-configurable via the A_CFG[2:0] bits in the DEVCFG register. It can operate as an open-drain arming output (active-high with pulldown or active-low with pullup) or as a PCM output proportional to acceleration. Configuration occurs during initialization before ENDINIT is set, and the pin remains latched in that mode during normal operation.
What low-pass filter options does the MMA6856BKCWR2 provide?
The MMA6856BKCWR2 offers 12 programmable low-pass filter options: six 4-pole filters (50–1000 Hz) and six 3-pole variants (200–400 Hz), selected via LPF[3:0] bits in DEVCFG_X. Each setting configures both cutoff frequency and filter order, enabling optimization for crash pulse fidelity versus noise suppression in different vehicle architectures.
Is the MMA6856BKCWR2 qualified for automotive safety applications?
Yes, the MMA6856BKCWR2 is AEC-Q100 qualified (Grade 2, –40 °C to +105 °C) and part of NXP's SafeAssure portfolio. It includes built-in diagnostics such as CRC-protected register arrays, offset monitoring, self-test capability, and independent power supply supervision-all aligned with ISO 26262 ASIL-B readiness for airbag system integration.
MMA6856BKCWR2 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
- 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)
MMA6856BKCWR2 FAQ
1.How can I place an order for MMA6856BKCWR2 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMA6856BKCWR2 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 MMA6856BKCWR2 reliable?
The price and inventory of MMA6856BKCWR2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMA6856BKCWR2 is usually 5 days.
3.What payment methods are accepted for MMA6856BKCWR2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMA6856BKCWR2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMA6856BKCWR2?
MMA6856BKCWR2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMA6856BKCWR2 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 MMA6856BKCWR2?
For technical support, including MMA6856BKCWR2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMA6856BKCWR2 requirements.
6.How does Aetrix verify that MMA6856BKCWR2 is sourced from the original manufacturer or authorized distributors?
All MMA6856BKCWR2 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 MMA6856BKCWR2 meets industry standards.
7.What is the process for return or replacement of MMA6856BKCWR2?
All MMA6856BKCWR2 units undergo pre-shipment inspection (PSI). If there is an issue with MMA6856BKCWR2, 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 MMA6856BKCWR2 part is unused and in its original packaging.
Return procedure for MMA6856BKCWR2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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