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NXP Semiconductors MMA6853BKW
- Part No.:
- MMA6853BKW
- Manufacturer:
- NXP Semiconductors
- Category:
- Accelerometers
- Package:
- 16-QFN Exposed Pad
- Datasheet:
-
MMA6853BKW.pdf
- Description:
- ACCELEROMETER 50G SPI 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,081
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Product details
Overview
MMA6853BKW from NXP Semiconductors (formerly Freescale) is a single-axis, ±50g, SPI-output inertial sensor designed for automotive airbag deployment systems. It features 10-bit digital output, programmable arming logic, 12 selectable low-pass filter configurations (50 Hz to 1000 Hz), and AEC-Q100 Grade 2 qualification. Its over-damped lateral g-cell ensures robust crash-sensing response in front-impact collision detection.
For engineers reviewing the MMA6853BKW datasheet, MMA6853BKW pinout, MMA6853BKW application, or MMA6853BKW equivalent, this page delivers verified electrical specs, validated SPI timing constraints, confirmed automotive-grade reliability data, and precise pin-level functional roles - all aligned with Rev 4 (Dec 2011) Freescale technical documentation.
Technical Context
The MMA6853BKW integrates a sigma-delta analog front-end with an 8 MHz internal oscillator, IIR/SINC digital filtering, and configurable offset cancellation (6.29 s averaging, <0.25 LSB/s slew). Its signal chain supports both signed and unsigned 10-bit SPI output formats, with programmable ARM/PCM output modes including moving-average, count, and unfiltered arming activation.
It implements dual power domains (VREGA/VSSA for analog, VREG/VSS for digital), independent voltage monitoring per supply rail, and factory-trimmed sensitivity (9.766 LSB/g at ±50g range), with self-test functionality enabling in-system verification of mechanical deflection (ΔSTHI = 21.37–39.38 g across temperature).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Full-Scale Range | ±50g - defines maximum measurable acceleration before ADC saturation; matches airbag crash pulse envelope |
| Digital Output Resolution | 10-bit signed or unsigned - provides 1024 discrete levels; zero-g mapped to 0 (signed) or 512 (unsigned) |
| Sensitivity | 9.766 LSB/g - enables direct conversion of raw SPI value to g-force without scaling firmware |
| Low-Pass Filter Options | 12 configurations (50–1000 Hz, 3- or 4-pole) - allows tuning bandwidth to suppress road noise while preserving crash transients |
| Supply Voltage | 3.3 V or 5.0 V single supply - supports legacy 5 V MCU interfaces and modern 3.3 V automotive ECUs |
| AEC-Q100 Qualification | Grade 2 (−40°C to +105°C) - certified for under-hood and passenger compartment deployment |
| Package | 16-pin QFN, 6 mm × 6 mm, Pb-free - surface-mount compatible with automated reflow, thermal pad for junction cooling |
Pinout & Package
Pb-free 16-pin QFN package (6 mm × 6 mm, Case 2086-01) with exposed thermal pad internally connected to VSS. Pin 17 (PAD) is die attach flag; corner pads tied to VSS.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VREGA | Analog supply input | Power for internal analog circuitry; requires 1 μF ceramic capacitor to VSSA per datasheet Figure 1 |
| VSS / VSSA | Digital & analog ground | Separate return paths prevent noise coupling between digital logic and sensitive analog sensing path |
| VREG | Digital supply input | Regulated 2.5 V internal digital rail; requires 1 μF decoupling capacitor to VSS |
| VCC | Main supply input | 3.3 V or 5 V primary power; 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 |
| MISO/MOSI/SCLK/CS | SPI interface | Standard 4-wire SPI with internal pullup on CS and pulldown on SCLK/MOSI; supports daisy-chaining |
Key Features
| Feature | Design Value |
|---|---|
| Programmable arming logic | Three operational modes (moving average, count, unfiltered) with configurable thresholds enable adaptive crash decisioning without host MCU intervention |
| Offset cancellation | 6.29 s averaging period and <0.25 LSB/s slew rate eliminate long-term drift while preserving fast transient response |
| Self-test capability | Two-level electrostatic deflection (ΔSTLow/ΔSTHI) allows in-system verification of mechanical integrity and signal chain functionality |
| Dual-supply domain isolation | Independent VREGA/VSSA and VREG/VSS rails minimize digital switching noise coupling into analog acceleration measurement path |
| Robust fault reporting | Dedicated status bits (OFFSET, MISOERR, DEVOFF) and fault response codes (e.g., 32 LSB for fault) simplify diagnostic software implementation |
Applications
| Frontal Collision Detection | Side-Impact Occupant Sensing |
|---|---|
Use Scenario: Detects rapid deceleration during head-on vehicle collisions to trigger airbag inflation within 20 ms. IC Role / Device Role / Timing Role: Primary crash sensor providing real-time acceleration data via SPI to airbag control unit (ACU); arming output directly asserts deployment enable. Use Value: ±50g range and 400 Hz LPF option capture crash pulses while rejecting road vibration; AEC-Q100 Grade 2 ensures operation at 105°C under hood. | Use Scenario: Mounted in door panel to detect lateral acceleration during side-impact events for curtain airbag deployment. IC Role / Device Role / Timing Role: Single-axis X-direction inertial sensor feeding acceleration magnitude and timing to ACU; ARM output signals valid impact event. Use Value: Over-damped g-cell design prevents resonance-induced false triggers; 12 LPF options allow tuning to vehicle-specific structural response. |
| Seat Belt Pretensioner Activation | Roll-Over Detection Support |
Use Scenario: Monitors vehicle deceleration during emergency braking to pre-tighten seat belts before occupant inertia causes forward movement. IC Role / Device Role / Timing Role: Secondary safety sensor interfacing via SPI; uses signed 10-bit output for direction-sensitive deceleration detection. Use Value: Programmable offset cancellation maintains accuracy over temperature and lifetime; 50g full-scale avoids saturation during aggressive braking. | Use Scenario: Integrated with multi-axis system to provide X-axis reference for roll-angle estimation during high-G maneuvers or rollover events. IC Role / Device Role / Timing Role: Dedicated X-axis channel delivering time-synchronized acceleration data to fusion algorithm; low-latency (<37 μs) datapath ensures timely input. Use Value: 1000 Hz LPF option preserves high-frequency dynamics needed for angular acceleration calculation; AEC-Q100 qualification guarantees reliability in safety-critical context. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar inertial sensor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMA6855BKW | ±120g full-scale range; 4.096 LSB/g sensitivity; identical pinout and SPI interface | Targeted at higher-deceleration crash scenarios (e.g., heavy truck, motorcycle); requires firmware scaling adjustment | Select when system must detect >50g events without saturation; retains same PCB layout and driver stack |
| ADXL278 | ±70g range; 2-wire I²C interface; different package (16-lead LFCSP); no integrated arming logic | Requires external comparator or MCU-based arming decision; suited for non-automotive industrial shock monitoring | Choose for cost-sensitive designs where SPI is not required and AEC-Q100 is optional; verify thermal performance at 105°C |
Compared with MMA6853BKW, MMA6855BKW extends dynamic range for extreme crash conditions but reduces resolution per g, while ADXL278 trades arming autonomy and automotive qualification for interface flexibility and broader commercial availability.
Availability
MMA6853BKW is available at Aetrix Electronics and suitable for automotive airbag control units, occupant classification systems, and seat belt pretensioner modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MMA6853BKW 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 secure connectivity solutions for automotive, industrial, and IoT applications.
The MMA685x family was developed specifically for automotive safety systems, emphasizing AEC-Q100 compliance, crash pulse fidelity, and integrated arming logic to reduce reliance on host processor decision latency.
FAQ
What is the full-scale acceleration range of the MMA6853BKW?
The MMA6853BKW has a full-scale range of ±50g, as specified in the Freescale MMA685x datasheet Rev 4 (December 2011). This range is factory-configured and fixed for the MMA6853BKW variant - it cannot be adjusted via register programming. The device delivers 9.766 LSB/g sensitivity at this range, enabling precise quantization of crash-relevant acceleration profiles while avoiding ADC saturation during typical frontal impacts. The MMA6853BKW's ±50g rating aligns with FMVSS 208 and ECE R94 test pulse requirements.
Does the MMA6853BKW support both 3.3 V and 5 V operation?
Yes, the MMA6853BKW supports single-supply operation at either 3.3 V or 5.0 V nominal voltage, as confirmed in Section 2.2 of the Freescale datasheet. Electrical characteristics (e.g., supply current, output voltage levels, timing parameters) are characterized across both voltage rails. The internal regulators (VREG = 2.50 V, VREGA = 2.50 V) maintain stable operation regardless of VCC choice, and IO thresholds (VIH = 2.0 V, VIL = 1.0 V) ensure compatibility with mixed-voltage MCU interfaces. No external level-shifting is required.
How is the ARM/PCM pin configured on the MMA6853BKW?
The ARM/PCM pin on the MMA6853BKW is configured via the A_CFG[2:0] bits in the DEVCFG register (address $0B). Per Table 9 of the datasheet, it supports seven modes: disabled, PCM output, or three arming modes (moving average, count, unfiltered) each with active-high or active-low polarity. Configuration occurs during initialization before ENDINIT is set. The pin operates as an open-drain output with programmable pullup/pulldown current (±50–100 μA), enabling direct connection to automotive wake-up or deployment enable lines without external components.
What low-pass filter options does the MMA6853BKW offer?
The MMA6853BKW provides 12 programmable low-pass filter options, divided into two groups: six at 64/fOSC sampling rate (cutoffs: 100–1000 Hz, 4-pole) and six at 128/fOSC rate (cutoffs: 50–500 Hz, 4-pole), plus two 3-pole variants. Selection is controlled by LPF[3:0] bits in DEVCFG_X ($0C). Filters are implemented digitally in the signal chain and do not affect g-cell mechanical response. The 400 Hz 4-pole option is commonly used in airbag systems to pass crash transients while attenuating engine and road noise above 500 Hz.
Is the MMA6853BKW qualified for automotive use?
Yes, the MMA6853BKW is qualified to AEC-Q100 Revision G (May 2007), specifically Grade 2 (−40°C to +105°C ambient operating temperature), as stated in the "Referenced Documents" section of the Freescale MMA685x datasheet. It undergoes full qualification testing including thermal cycling, humidity bias, and mechanical shock (±1500 g powered, ±2000 g unpowered). The device is intended for safety-critical automotive applications including airbag control units and meets ISO 26262 ASIL-B readiness requirements when integrated into compliant system architectures.
MMA6853BKW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 16-QFN Exposed Pad
- Packaging:
- Tray
- Product Status:
- Not For New Designs
- Type:
- Digital
- Axis:
- X, Y
- Acceleration Range:
- -
- Sensitivity (LSB/g):
- -
- 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-EP (6x6)
MMA6853BKW FAQ
1.How can I place an order for MMA6853BKW through Aetrix?
Please submit a Request for Quotation (RFQ) for MMA6853BKW 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 MMA6853BKW reliable?
The price and inventory of MMA6853BKW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMA6853BKW is usually 5 days.
3.What payment methods are accepted for MMA6853BKW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMA6853BKW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMA6853BKW?
MMA6853BKW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMA6853BKW 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 MMA6853BKW?
For technical support, including MMA6853BKW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMA6853BKW requirements.
6.How does Aetrix verify that MMA6853BKW is sourced from the original manufacturer or authorized distributors?
All MMA6853BKW 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 MMA6853BKW meets industry standards.
7.What is the process for return or replacement of MMA6853BKW?
All MMA6853BKW units undergo pre-shipment inspection (PSI). If there is an issue with MMA6853BKW, 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 MMA6853BKW part is unused and in its original packaging.
Return procedure for MMA6853BKW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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