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NXP Semiconductors MMA5148KW
- Part No.:
- MMA5148KW
- Manufacturer:
- NXP Semiconductors
- Category:
- Accelerometers
- Package:
- 16-QFN Exposed Pad
- Datasheet:
-
MMA5148KW.pdf
- Description:
- ACCELEROMETER 480G PCM/SPI 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,191
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Product details
Overview
MMA5148KW from NXP Semiconductors (formerly Freescale) is a Z-axis satellite accelerometer with PSI5 interface, ±480g full-scale range, 10-bit digital output, AEC-Q100 Grade 1 qualification (-40°C to +125°C), and integrated 400 Hz low-pass filter - designed for airbag crash detection in automotive safety systems.
For engineers reviewing the MMA5148KW datasheet, MMA5148KW pinout, MMA5148KW application, or MMA5148KW equivalent, this page delivers verified technical context, exact pin functions, real-world use cases in occupant sensing, and validated alternative options for PSI5-compatible high-g inertial sensing.
Technical Context
The MMA5148KW implements an overdamped MEMS g-cell with 16.289 kHz natural frequency and damping ratio of 1.25, paired with a ΣΔ ADC and SINC-based DSP signal chain. It supports PSI5 Version 1.3 communication at 125 kBaud or 190.5 kBaud, with programmable time slots (0.5 μs resolution) and optional daisy-chain topology via BUS_SW-controlled external FET.
Its internal architecture includes dual-stage offset cancellation (0.04 Hz HPF option), selectable 3-pole or 4-pole LPF, and independent analog/digital regulators (VREGA = 2.5 V ±75 mV, VREG = 2.5 V ±75 mV) fed from a buffered VBUF supply - ensuring EMC robustness and supply dropout immunity in harsh automotive environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Full-Scale Range | ±480g - enables detection of severe frontal/side impacts without saturation in airbag deployment systems. |
| Output Resolution | 10-bit digital output - provides 1 LSB/g sensitivity with ≤±7% total sensitivity error over temperature. |
| PSI5 Compliance | PSI5 v1.3 compliant (P10P-500/3L) - ensures interoperability with standard automotive PSI5 master controllers. |
| Filter Configuration | Selectable 400 Hz, 3-pole or 4-pole LPF - suppresses high-frequency noise while preserving crash pulse fidelity. |
| Operating Temperature | AEC-Q100 Grade 1: -40°C to +125°C - qualified for under-hood and passenger compartment mounting locations. |
| Internal Oscillator | 4 MHz ±5% - drives all timing-critical functions including interpolation, filtering, and PSI5 bit timing. |
| Supply Regulation | VBUF = 3.8 V ±200 mV; VREG/VREGA = 2.5 V ±75 mV - decoupled analog/digital rails minimize crosstalk in mixed-signal operation. |
Pinout & Package
Pb-free 16-pin QFN (6 mm × 6 mm, case 2086-01), exposed thermal pad internally connected to VSS.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | PSI5 Power & Data Line Supply | Connects to PSI5 bus via series resistor; powers device and carries modulated response current. |
| IDATA | PSI5 Response Current Output | Modulates current on VCC line for PSI5 data transmission; requires external pull-up resistor. |
| VBUF | Buffer Regulator Input | Feeds internal VREG/VREGA regulators; provides supply dropout immunity and EMC isolation. |
| VREG / VREGA | Digital / Analog Core Supplies | Separate regulated 2.5 V supplies for digital logic and analog signal chain - critical for noise separation. |
| BUS_SW | Daisy Chain Gate Driver | Drives external N-channel FET gate for PSI5 daisy-chain configuration; open-drain compatible. |
| PCM | Test PCM Output | 4 MHz pulse-code modulated output proportional to acceleration - enabled via OTP for production test only. |
Key Features
| Feature | Design Value |
|---|---|
| Overdamped Z-axis MEMS sensor | 16.289 kHz natural frequency and 1.25 damping ratio - eliminates resonance-induced measurement errors during crash events. |
| PSI5 programmable time slots | 0.5 μs resolution addressing - enables precise synchronization across multi-sensor PSI5 networks in vehicle ECUs. |
| Dual-stage offset cancellation | Configurable 0.04 Hz HPF - maintains DC stability while rejecting thermal drift in long-duration monitoring. |
| Self-test capability | 12 LSB output during active self-test at ±480g range - allows in-system functional verification without mechanical stimulus. |
| Integrated voltage monitors | Independent UVLO thresholds for VCC (3.4–4.0 V), VBUF (2.95–3.35 V), VREG/VREGA (2.15–2.35 V) - ensures reliable operation during battery transients. |
Applications
| Frontal Airbag Crash Detection | Side-Impact Occupant Sensing |
|---|---|
Use Scenario: Mounted on vehicle firewall or instrument panel to detect rapid deceleration during head-on collisions. IC Role / Device Role / Timing Role: Z-axis accelerometer providing real-time crash pulse data via PSI5 to airbag control unit within <1 ms latency. Use Value: ±480g range prevents clipping during high-speed barrier tests; 400 Hz LPF preserves crash signature rise time while rejecting road noise. | Use Scenario: Integrated into door modules or B-pillars to sense lateral acceleration during side collisions or rollovers. IC Role / Device Role / Timing Role: Satellite sensor feeding PSI5 daisy-chain network; BUS_SW enables compact multi-node layout without additional wiring. Use Value: AEC-Q100 Grade 1 rating ensures reliability in high-temperature door cavities; 0.5 μs time slot resolution supports synchronized sampling across 4+ sensors. |
| Passenger Presence Detection | Seat Belt Pretensioner Activation |
Use Scenario: Embedded in seat cushion or backrest to monitor occupant mass and position via low-g vibration analysis. IC Role / Device Role / Timing Role: High-resolution 10-bit accelerometer capturing micro-vibrations; uses 0.04 Hz HPF to isolate occupant dynamics from vehicle motion. Use Value: Digital offset cancellation reduces baseline drift to ±1 LSB over temperature - enabling accurate weight estimation without recalibration. | Use Scenario: Mounted near seat belt retractor to detect sudden forward acceleration indicating unbuckled occupant ejection risk. IC Role / Device Role / Timing Role: Fast-response Z-axis sensor triggering pretensioner within 8 ms of event onset using internal 16 μs sample rate interpolated to 1 μs. Use Value: 2200 g positive overload limit prevents mechanical damage during aggressive pretensioner firing; VBUF regulation sustains operation during power rail collapse. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PSI5 accelerometer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| NXP MMA5225K | ±250g range, 12-bit output, SPI/PSI5 dual interface, same 16-pin QFN package. | Limited to lower-g crash scenarios; lacks daisy-chain BUS_SW driver. | Choose when higher resolution and SPI debug access are prioritized over extreme-g range and daisy-chain scalability. |
| Infineon KMR2200 | ±200g range, PSI5 v1.3 compliant, integrated diagnostic features, 12-pin TDFN package. | Smaller footprint but no BUS_SW; different pinout prevents direct PCB reuse. | Prefer for space-constrained modules where diagnostic coverage exceeds ±480g requirement. |
Compared with MMA5148KW, MMA5225K offers finer resolution but lower overload tolerance, while KMR2200 provides enhanced diagnostics in a smaller package - neither matches the combination of ±480g range, daisy-chain support, and AEC-Q100 Grade 1 performance in the same form factor.
Availability
MMA5148KW is available at Aetrix Electronics and suitable for automotive airbag systems, occupant classification modules, and seat belt pretensioner control requiring stable component supply across extended production lifecycles.
Supply support for MMA5148KW 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 automotive, industrial, and IoT applications, with deep expertise in sensor signal conditioning and automotive interface standards.
The MMA51xxKW product line was engineered specifically for PSI5-based automotive safety systems, delivering high-g inertial sensing with built-in functional safety features and AEC-Q100 compliance.
FAQ
What is the full-scale range and output resolution of the MMA5148KW?
The MMA5148KW has a ±480g full-scale range and delivers a 10-bit digital output. Its sensitivity is calibrated to 1 LSB/g at this range, with total sensitivity error bounded by ±7% over temperature and supply voltage - enabling precise quantification of high-magnitude crash events without saturation in automotive airbag applications.
Does the MMA5148KW support PSI5 daisy-chaining, and how is it implemented?
Yes, the MMA5148KW supports PSI5 daisy-chaining via the BUS_SW pin, which drives the gate of an external N-channel MOSFET to connect VSS to VSS_OUT. This enables multi-sensor networks on a single PSI5 bus without additional wiring harnesses. The MMA5148KW must be configured in daisy-chain mode via OTP programming, and time slot allocation is managed through the TIMESLOTx registers.
What are the key power supply requirements for stable operation of the MMA5148KW?
The MMA5148KW requires three regulated supplies: VCC (4.2–17.0 V, PSI5 bus-powered), VBUF (3.6–4.0 V, feeds internal regulators), and separate VREG (2.425–2.575 V) and VREGA (2.425–2.575 V) rails. External capacitors (500–1500 nF) are mandatory on VBUF, VREG, and VREGA pins to ensure low-impedance decoupling and prevent UVLO triggering during transients.
How does the MMA5148KW handle offset drift over temperature and time?
The MMA5148KW implements dual-stage offset cancellation with configurable high-pass filters (0.04 Hz, 0.1 Hz, or 0.3 Hz). After cancellation, digital offset is limited to ±1 LSB for 0.04 Hz HPF mode across temperature - achieved through internal calibration and continuous monitoring. An offset monitor tracks residual error up to ±66 LSB before flagging a fault condition.
Is the MMA5148KW pin-compatible with other devices in the MMA51xxKW family?
Yes, all MMA51xxKW variants - including MMA5106KW, MMA5112KW, MMA5124KW, and MMA5148KW - share identical 16-pin QFN packaging, pinout, and electrical interface. Range selection is factory-programmed and invisible electrically; system-level behavior (e.g., sensitivity, overload limits) differs per variant but requires no hardware changes when substituting within the same PCB footprint.
MMA5148KW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- MMA
- Package/Case:
- 16-QFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Not For New Designs
- Type:
- Digital
- Axis:
- Z
- Acceleration Range:
- ±480g
- Sensitivity (LSB/g):
- 1
- Sensitivity (mV/g):
- -
- Bandwidth:
- -
- Output Type:
- PCM, SPI
- Voltage - Supply:
- 4.2V ~ 17V
- Features:
- Selectable Low Pass Filter
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QFN (6x6)
MMA5148KW FAQ
1.How can I place an order for MMA5148KW through Aetrix?
Please submit a Request for Quotation (RFQ) for MMA5148KW 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 MMA5148KW reliable?
The price and inventory of MMA5148KW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMA5148KW is usually 5 days.
3.What payment methods are accepted for MMA5148KW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMA5148KW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMA5148KW?
MMA5148KW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMA5148KW 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 MMA5148KW?
For technical support, including MMA5148KW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMA5148KW requirements.
6.How does Aetrix verify that MMA5148KW is sourced from the original manufacturer or authorized distributors?
All MMA5148KW 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 MMA5148KW meets industry standards.
7.What is the process for return or replacement of MMA5148KW?
All MMA5148KW units undergo pre-shipment inspection (PSI). If there is an issue with MMA5148KW, 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 MMA5148KW part is unused and in its original packaging.
Return procedure for MMA5148KW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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