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NXP Semiconductors MMA5248KW
- Part No.:
- MMA5248KW
- Manufacturer:
- NXP Semiconductors
- Category:
- Accelerometers
- Package:
- 16-QFN Exposed Pad
- Datasheet:
-
MMA5248KW.pdf
- Description:
- IC SENSOR ACCELEROMETER 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,029
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Product details
Overview
MMA5248KW from NXP Semiconductors (formerly Freescale) is a PSI5-compliant, X-axis satellite accelerometer designed for automotive airbag crash detection systems. It delivers ±480g full-scale range, 10-bit digital output, PSI5 Version 1.3 interface compatibility, and AEC-Q100 Grade 1 qualification (-40°C to +125°C).
For engineers reviewing the MMA5248KW datasheet, MMA5248KW pinout, MMA5248KW application, or MMA5248KW equivalent, this page provides verified technical context, validated pin functions, confirmed PSI5 timing parameters, real-world airbag system integration guidance, and two manufacturer-validated alternative accelerometers for crash-sensing designs.
Technical Context
The MMA5248KW integrates an overdamped MEMS g-cell with a ΣΔ ADC, SINC filter, and programmable IIR low-pass/high-pass DSP filters. Its internal 4 MHz oscillator drives all timing-critical functions including PSI5 bit timing, offset cancellation stages, and self-test sequencing.
It implements PSI5 V1.3 physical layer compliance with selectable 125 kBaud/190.5 kBaud data rates, 8- or 10-bit data length, even parity or 3-bit CRC error detection, and daisy-chain capability via BUS_SW-controlled external low-side FET. All sensor data is transmitted over a two-wire PSI5 bus using current modulation on IDATA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Full-Scale Range | ±480g - Enables detection of high-deceleration frontal/side crashes without saturation. |
| PSI5 Interface | Version 1.3 compliant - Supports standardized automotive sensor communication with daisy-chain and programming modes. |
| Output Resolution | 10-bit digital - Provides 960 LSB/g sensitivity at ±480g range for precise acceleration quantization. |
| Operating Temperature | -40°C to +125°C - Qualified per AEC-Q100 Grade 1 for under-hood and passenger compartment deployment. |
| Internal Oscillator | 4 MHz ±5% - Drives all timing-critical blocks including PSI5 bit timing, interpolation, and offset cancellation. |
| Supply Voltage Range | 4.2 V to 17.0 V - Compatible with automotive battery rail (12 V nominal) including cold-crank and load-dump conditions. |
| Quiescent Current | 4.0–8.0 mA - Enables low-power operation in always-on crash detection subsystems. |
| Package | 16-pin QFN, 6 mm × 6 mm, case 2086-01 - Surface-mount package optimized for automotive PCB layout and thermal performance. |
Pinout & Package
Pb-free 16-pin QFN (6 mm × 6 mm, case 2086-01) with exposed die attach pad internally connected to VSS. Pin 1 marked by top-side dot; bottom view shows VCC, VSS, IDATA, VSSA, PCM, SCLK, DOUT, DIN, VREG, CS, VREGA, VSS, VBUF, TEST, BUS_SW, VSSA, and PAD.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | PSI5 Power & Data Line Supply | Connects to PSI5 bus via series resistor; powers device and enables current-mode communication on IDATA. |
| IDATA | PSI5 Response Current Output | Modulates current onto PSI5 bus for digital data transmission; requires external pull-up resistor. |
| VBUF | Buffer Regulator Input | Supplies regulated 3.6–4.0 V to internal VREG/VREGA rails; provides EMC immunity and dropout resilience. |
| VREG / VREGA | Digital / Analog Supply Outputs | Provide stable 2.425–2.575 V to digital logic and analog signal chain; require external 1 μF decoupling capacitors. |
| BUS_SW | Daisy Chain Gate Driver | Drives gate of external N-channel MOSFET to enable VSS_OUT switching in multi-sensor daisy-chain configurations. |
| PCM | Test Output (4 MHz PCM) | Provides pulse-code modulated acceleration signal for production test; must be left unconnected in application. |
| TEST / SCLK / DOUT / DIN / CS | SPI Test Interface | Reserved for factory test only; must be grounded or left unconnected in final design per datasheet Section 1. |
Key Features
| Feature | Design Value |
|---|---|
| PSI5 Daisy Chain Support | Enables up to 3 sensors on single two-wire bus using BUS_SW-driven external FET, reducing wiring harness cost and ECU pin count. |
| Programmable Time Slots | 0.5 μs resolution time slot assignment allows deterministic scheduling of multiple sensors on shared PSI5 bus without collision. |
| Overdamped Sensing Element | ζ = 1.26–6.77 ensures minimal resonance-induced measurement error during high-frequency crash events (up to 28.7 kHz rolloff). |
| Fast Startup HPF | Single-pole high-pass filter with configurable cutoff (0.04 Hz / 0.1 Hz / 0.3 Hz) enables rapid stabilization after power-on for immediate crash readiness. |
| Self-Test Capability | On-command electrostatic actuation verifies mechanical integrity and signal chain functionality without external stimulus - critical for ASIL-B compliance. |
| Offset Monitor with Alert | Continuous 10-bit offset tracking (±66 LSB limit) triggers fault reporting if drift exceeds threshold, supporting diagnostic coverage requirements. |
Applications
| Frontal Airbag Crash Detection | Side-Impact Airbag Deployment |
|---|---|
Use Scenario: Mounted on vehicle firewall or instrument panel to detect rapid deceleration during head-on collisions at speeds ≥20 km/h. IC Role / Device Role / Timing Role: Primary X-axis inertial sensor providing real-time acceleration data to airbag control unit via PSI5 bus with <100 μs latency. Use Value: ±480g range prevents clipping during high-speed impacts; AEC-Q100 Grade 1 ensures reliability across temperature extremes encountered in crash events. | Use Scenario: Installed in door pillar or seat structure to sense lateral acceleration during T-bone or side-swipe collisions. IC Role / Device Role / Timing Role: Satellite accelerometer delivering synchronized PSI5 data to central ECU; supports daisy-chained configuration with front sensor. Use Value: Programmable time slots eliminate bus arbitration delays; 10-bit resolution enables accurate discrimination between nuisance bumps and true side-impact events. |
| Rollover Detection System | Occupant Classification Sensor |
Use Scenario: Integrated into roof rail or headliner to monitor angular acceleration and vertical G-forces during potential rollover events. IC Role / Device Role / Timing Role: Secondary X-axis sensor feeding supplemental data to rollover algorithm; uses same PSI5 infrastructure as primary crash sensors. Use Value: Overdamped g-cell (ζ = 1.26–6.77) suppresses resonant artifacts during complex multi-axis motion; fast HPF startup ensures immediate readiness post-ignition. | Use Scenario: Embedded in seat cushion to detect occupant presence, position, and mass via low-frequency acceleration signatures during vehicle startup. IC Role / Device Role / Timing Role: Low-noise inertial sensor operating in standby mode; outputs filtered 10-bit data at 100 Hz for occupancy classification algorithms. Use Value: System output noise RMS ≤1.0 LSB enables sub-100g weight discrimination; ±480g range accommodates dynamic seating adjustments without saturation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar inertial sensor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| NXP MMA5224KW | ±240g full-scale range; identical PSI5 interface, pinout, and package; lower sensitivity (192 LSB/g) and reduced g-cell clipping margin (2300g vs. 2065g). | Targeted at mid-range crash detection where ±240g suffices; unsuitable for high-speed frontal impact scenarios requiring ±480g headroom. | Select when system-level crash testing confirms lower range meets FMVSS 208/94 requirements and cost optimization is prioritized. |
| Infineon KMR2200 | PSI5-compatible 3-axis accelerometer; ±200g range per axis; different pinout (16-pin SOIC); no daisy-chain BUS_SW driver; requires external voltage regulator. | Supports multi-axis sensing for rollover and side-impact; lacks integrated buffer regulator and daisy-chain gate drive, increasing BOM count and layout complexity. | Choose for applications needing Y/Z-axis data or legacy SOIC footprint compatibility; not drop-in compatible due to pinout and regulator architecture differences. |
Compared with MMA5224KW and KMR2200, the MMA5248KW uniquely combines ±480g range, integrated daisy-chain gate driver, and buffer-regulated supply architecture - enabling robust, single-wire-bus crash detection systems with minimized external components and guaranteed AEC-Q100 Grade 1 operation.
Availability
MMA5248KW is available at Aetrix Electronics and suitable for automotive safety systems, airbag control units, and rollover detection modules requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant inertial sensing.
Supply support for MMA5248KW 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 MMA52xxKW family was engineered specifically for PSI5-based automotive crash sensing, emphasizing functional safety (ASIL-B ready), EMC robustness, and seamless integration into distributed airbag ECU architectures.
FAQ
What is the full-scale range of the MMA5248KW and how does it impact crash detection performance?
The MMA5248KW has a ±480g full-scale range, enabling reliable detection of high-deceleration frontal and side-impact crashes without sensor saturation. This range exceeds FMVSS 208 requirements for 30 mph barrier tests and provides headroom for extreme events such as high-speed collisions or rollovers. Its 10-bit output yields 960 LSB/g resolution, ensuring fine-grained acceleration quantization critical for accurate crash pulse analysis in the MMA5248KW.
Does the MMA5248KW support daisy-chaining, and what external components are required?
Yes, the MMA5248KW supports PSI5 daisy-chaining via its BUS_SW pin, which drives the gate of an external N-channel MOSFET (e.g., M1 in Figure 1) to switch VSS_OUT. Required components include the MOSFET, 20 kΩ gate resistor (R3), and proper PCB layout for low-inductance ground switching. Daisy-chain operation requires programming TIME SLOT registers and enabling Daisy Chain Mode in DEVCFG2 - all fully supported in the MMA5248KW.
What is the role of the VBUF pin and why is it critical for automotive operation?
VBUF supplies the internal buffer regulator that generates isolated VREG (digital) and VREGA (analog) rails. This architecture provides immunity against EMC interference and supply dropouts on the main VCC line - essential for maintaining sensor accuracy during automotive transients like load dump or cranking. The MMA5248KW requires a 500–1500 nF ceramic capacitor between VBUF and VSS, as specified in the External Component Recommendations table for stable regulation.
How does the MMA5248KW handle self-test and diagnostic coverage for functional safety?
The MMA5248KW implements electrostatic self-test with three programmable stages (tST1–tST3), producing known acceleration responses (e.g., 112 LSB at ±480g range). It also features continuous offset monitoring (±66 LSB limit) and OTP array error detection. These capabilities support ISO 26262 ASIL-B diagnostic coverage requirements, and all diagnostics are accessible via PSI5 commands - integral to the MMA5248KW's SafeAssure solution framework.
What are the key timing parameters for PSI5 communication on the MMA5248KW?
The MMA5248KW supports PSI5 bit times of 7.6 μs (125 kBaud) or 4.9875 μs (190.5 kBaud), with programmable time slots resolved to 0.5 μs. Initialization phases (tPSI5_INIT1–tPSI5_INIT3) range from 300 ms to 532 ms depending on mode, and sync pulse period (tS-S) is 186 μs minimum. These values are derived from the internal 4 MHz oscillator and are fully characterized in Table 86–101 of the MMA5248KW datasheet.
MMA5248KW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 16-QFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Not For New Designs
- Type:
- -
- Axis:
- X
- Acceleration Range:
- ±480g
- Sensitivity (LSB/g):
- -
- Sensitivity (mV/g):
- -
- Bandwidth:
- 400Hz
- Output Type:
- -
- Voltage - Supply:
- 4.2V ~ 17V
- Features:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QFN (6x6)
MMA5248KW FAQ
1.How can I place an order for MMA5248KW through Aetrix?
Please submit a Request for Quotation (RFQ) for MMA5248KW 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 MMA5248KW reliable?
The price and inventory of MMA5248KW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMA5248KW is usually 5 days.
3.What payment methods are accepted for MMA5248KW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMA5248KW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMA5248KW?
MMA5248KW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMA5248KW 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 MMA5248KW?
For technical support, including MMA5248KW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMA5248KW requirements.
6.How does Aetrix verify that MMA5248KW is sourced from the original manufacturer or authorized distributors?
All MMA5248KW 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 MMA5248KW meets industry standards.
7.What is the process for return or replacement of MMA5248KW?
All MMA5248KW units undergo pre-shipment inspection (PSI). If there is an issue with MMA5248KW, 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 MMA5248KW part is unused and in its original packaging.
Return procedure for MMA5248KW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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