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NXP Semiconductors MMA6519KW
- Part No.:
- MMA6519KW
- Manufacturer:
- NXP Semiconductors
- Category:
- Accelerometers
- Package:
- 16-QFN Exposed Pad
- Datasheet:
-
MMA6519KW.pdf
- Description:
- ACCELEROMETER 80G SPI 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,527
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Product details
Overview
MMA6519KW from NXP Semiconductors (formerly Freescale) is a dual-axis, SPI-interface, over-damped lateral accelerometer with ±80g full-scale range on both X and Y axes, 12-bit digital output, and AEC-Q100 Grade 1 qualification - designed specifically for automotive airbag crash sensing systems.
For engineers reviewing the MMA6519KW datasheet, MMA6519KW pinout, MMA6519KW application, or MMA6519KW equivalent, key selection criteria include its programmable arming outputs per axis, twelve selectable low-pass filter options (50–1000 Hz), offset cancellation capability (<0.25 LSB/s slew rate), 16-pin QFN 6×6 mm package, and compliance with automotive safety requirements.
Technical Context
The MMA6519KW integrates two independent over-damped MEMS g-cells with natural frequency ~13.5 kHz and damping ratio >2.4, coupled to ΣΔ ADCs and configurable SINC/IIR digital filters. Its internal 8 MHz oscillator feeds clock-divided paths for 64/128-sample DSP rates and interpolation.
Each axis features independent register-controlled arming logic (open-drain ARM_X/ARM_Y), programmable low-pass filtering, self-test activation with calibrated deflection values stored in OTP, and offset monitoring with ±100 LSB thresholds - all accessible via SPI with CRC-protected register array and DEVRES flag for power-on initialization status.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Full-Scale Range | ±80g on both X and Y axes - enables precise crash pulse detection within airbag deployment timing windows. |
| Digital Output Resolution | 12-bit signed or unsigned SPI output - provides 4096-count dynamic range with LSB sensitivity of 24.0 LSB/g. |
| Supply Voltage | 3.3 V or 5.0 V single supply - supports legacy 5V automotive microcontrollers and modern 3.3V domains without level-shifting. |
| Low-Pass Filter Options | 12 selectable cutoff frequencies (50–1000 Hz) - allows tuning signal bandwidth to match vehicle-specific crash signature profiles. |
| Offset Cancellation | Optional averaging period >6.2 s with <0.25 LSB/s slew rate - stabilizes zero-g baseline under thermal drift and long-term bias shift. |
| AEC-Q100 Qualification | Grade 1 (−40°C to +105°C ambient) - validated for under-hood and passenger compartment deployment in production vehicles. |
| Power Supply Monitor | VCC UV threshold 2.74–3.02 V; VREG UV/OV thresholds 2.10–2.85 V - ensures reliable operation during battery transients and cold-crank conditions. |
Pinout & Package
Pb-Free 16-pin QFN package, 6 mm × 6 mm, exposed die attach pad (internally connected to VSS), case 2086-01.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VREGA | Analog supply input | Provides regulated 2.5 V for analog front-end; requires 1 μF decoupling to VSSA per datasheet Figure 1. |
| VSS, VSSA | Digital and analog ground | Separate ground returns prevent noise coupling between digital control logic and analog sensor path. |
| VREG | Digital supply input | Delivers 2.5 V to digital core; requires 1 μF decoupling to VSS. |
| ARM_X / ARM_Y | Configurable arming output | Open-drain outputs programmable as active-low/high arming signals or PCM acceleration data - directly interface with airbag controller interrupt inputs. |
| SPI Interface (CS, SCLK, MOSI, MISO) | Serial peripheral interface | Full-duplex SPI with 120 ns minimum clock period supports up to 8.33 MHz operation; includes CRC-protected register access and fault detection. |
| TEST/VPP | Factory programming voltage | Must be tied to VSS in application; not used during normal operation or field programming. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-axis independent arming | ARM_X and ARM_Y pins support per-axis crash detection logic with programmable thresholds and response modes - eliminates need for external comparators in airbag ECU designs. |
| Twelve low-pass filter configurations | Selectable 4-pole or 3-pole filters from 50 Hz to 1000 Hz - enables optimization for different vehicle mass, stiffness, and crash pulse characteristics without hardware change. |
| On-chip offset cancellation | Hardware-averaged correction with >6.2 s integration time and <0.25 LSB/s slew rate - maintains zero-g accuracy across temperature and lifetime without host MCU intervention. |
| Self-test with factory-trimmed deflection | Calibrated STDEFL_X/Y registers store device-specific nominal deflection values - enables deterministic pass/fail validation of sensor functionality at startup or periodic diagnostics. |
| AEC-Q100 Grade 1 compliance | Qualified for −40°C to +105°C ambient operation with verified shock survivability (±1500 g powered, ±2000 g unpowered) - meets automotive functional safety requirements for airbag systems. |
Applications
| Frontal Crash Detection | Side-Impact Sensing |
|---|---|
Use Scenario: Detect rapid deceleration during head-on collision to trigger airbag deployment within 20–30 ms. IC Role / Device Role / Timing Role: Dual-axis inertial sensor providing synchronized X/Y acceleration data to airbag control unit via SPI; arming outputs assert within 1.51 μs of threshold crossing. Use Value: ±80g range and 400 Hz LPF option capture critical crash pulse shape while rejecting road noise; over-damped g-cell ensures minimal ringing during high-slew events. | Use Scenario: Sense lateral acceleration during T-bone or side-swipe impact to deploy side airbags or curtain airbags. IC Role / Device Role / Timing Role: Y-axis primary sensing element with independent ARM_Y output; configurable 200 Hz LPF suppresses suspension vibration while preserving impact transients. Use Value: Cross-axis sensitivity <±4% prevents false triggers from longitudinal braking; offset cancellation maintains baseline stability during door-mounted installation. |
| Roll-Over Detection | Occupant Position Sensing |
Use Scenario: Monitor angular acceleration and lateral G-force buildup during sharp turns or off-road maneuvers to predict vehicle rollover. IC Role / Device Role / Timing Role: Dual-axis accelerometer feeding real-time data to vehicle dynamics controller; uses 50 Hz LPF for low-frequency roll-rate estimation. Use Value: 12-bit resolution and <1 LSB RMS noise enable detection of sub-0.1g lateral build-up; AEC-Q100 qualification ensures reliability in harsh chassis environments. | Use Scenario: Determine occupant proximity to dashboard or seatback using low-level vibration and posture-induced acceleration signatures. IC Role / Device Role / Timing Role: Low-noise X/Y sensing node interfaced to body controller; operates in low-power mode with periodic wake-up via SPI command. Use Value: Programmable offset cancellation and 1000 Hz LPF option allow adaptive filtering for varying seating positions; 3.3 V/5 V compatibility simplifies integration into mixed-voltage ECUs. |
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 |
|---|---|---|---|
| MMA6525KW | ±105g full-scale range per axis; identical pinout, SPI interface, and package. | Better suited for heavier vehicles or higher-speed crash testing where extended range reduces saturation risk. | Select when crash pulse amplitudes exceed ±80g in validation; no PCB changes required but firmware must scale sensitivity (18.2 LSB/g vs. 24.0 LSB/g). |
| ADXL313 | I²C/SPI interface; ±0.5g to ±4g range; 13-bit output; no arming outputs; RoHS-compliant 32-lead LFCSP. | Targeted at non-safety-critical applications like telematics or infotainment motion sensing - not AEC-Q100 qualified. | Use only in non-automotive or non-airbag contexts; lacks arming logic, automotive qualification, and over-damped architecture for crash sensing. |
Compared with MMA6525KW and ADXL313, the MMA6519KW uniquely combines AEC-Q100 Grade 1 qualification, dual-axis ±80g range, integrated arming outputs, and over-damped MEMS structure optimized for airbag deployment timing - making it the only drop-in solution for production automotive frontal crash sensing.
Availability
MMA6519KW is available at Aetrix Electronics and suitable for automotive airbag systems, vehicle dynamics control units, and rollover prevention modules requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for MMA6519KW 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 company specializing in secure connectivity solutions for automotive, industrial, and IoT applications, with leadership in automotive MCUs, radar, and inertial sensing.
The MMA6519KW belongs to NXP's SafeAssure portfolio of functional safety-certified sensors, engineered specifically for ASIL-B compliant airbag control units and crash event detection systems.
FAQ
What is the operating temperature range for the MMA6519KW?
The MMA6519KW is qualified for −40°C to +105°C ambient temperature per AEC-Q100 Grade 1 requirements. This range is verified by 100% final test and supports deployment in engine compartments, under-seat locations, and passenger cabins. The device maintains specified performance including offset stability, sensitivity error (±5%), and arming response time across this full range.
Does the MMA6519KW support both 3.3 V and 5 V supply voltages?
Yes, the MMA6519KW 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 for analog (VREGA) and digital (VREG) circuitry. Power supply monitor thresholds are scaled accordingly - for example, VCC under-voltage trips at 2.74 V (3.3 V domain) or 4.25 V (5 V domain) - ensuring robust operation during battery transients.
How does the offset cancellation function work in the MMA6519KW?
The MMA6519KW implements hardware-based offset cancellation with >6.2 s averaging period and <0.25 LSB/s slew rate. When enabled, it continuously updates correction values stored in OFFCORR_X/Y registers. The corrected output is applied in real time to SPI data, reducing zero-g drift to <±0.25 LSB. This occurs autonomously without host processor involvement and remains active across temperature and time - critical for long-term airbag system reliability.
Can the ARM_X and ARM_Y pins be used for purposes other than arming signals?
Yes, the ARM_X and ARM_Y pins are multifunctional. Via DEVCFG register configuration, they can operate as open-drain arming outputs (active-low or active-high) or as PCM digital outputs proportional to X/Y acceleration. In PCM mode, they deliver pulse-coded acceleration data synchronized to the internal oscillator - enabling direct connection to microcontroller capture inputs for time-stamped event analysis without SPI overhead.
What low-pass filter options are available on the MMA6519KW and how are they selected?
The MMA6519KW offers twelve programmable low-pass filter configurations: six at 64-sample DSP rate (100–1000 Hz) and six at 128-sample rate (50–500 Hz), implemented as 4-pole or 3-pole IIR filters. Selection is made by writing LPF_X[3:0] and LPF_Y[3:0] bits in DEVCFG_X/Y registers. Filter choice directly impacts latency (e.g., 100 Hz filter adds ~7 ms activation delay) and noise rejection - allowing tuning to specific vehicle crash signatures.
MMA6519KW 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:
- ±80g
- Sensitivity (LSB/g):
- 24
- Sensitivity (mV/g):
- -
- Bandwidth:
- -
- Output Type:
- SPI
- Voltage - Supply:
- 3.135V ~ 5.25V
- Features:
- Selectable Low Pass Filter
- Operating Temperature:
- -40°C ~ 105°C
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QFN (6x6)
MMA6519KW FAQ
1.How can I place an order for MMA6519KW through Aetrix?
Please submit a Request for Quotation (RFQ) for MMA6519KW 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 MMA6519KW reliable?
The price and inventory of MMA6519KW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMA6519KW is usually 5 days.
3.What payment methods are accepted for MMA6519KW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMA6519KW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMA6519KW?
MMA6519KW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMA6519KW 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 MMA6519KW?
For technical support, including MMA6519KW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMA6519KW requirements.
6.How does Aetrix verify that MMA6519KW is sourced from the original manufacturer or authorized distributors?
All MMA6519KW 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 MMA6519KW meets industry standards.
7.What is the process for return or replacement of MMA6519KW?
All MMA6519KW units undergo pre-shipment inspection (PSI). If there is an issue with MMA6519KW, 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 MMA6519KW part is unused and in its original packaging.
Return procedure for MMA6519KW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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