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NXP Semiconductors MMA5148LWR2
- Part No.:
- MMA5148LWR2
- Manufacturer:
- NXP Semiconductors
- Category:
- Accelerometers
- Package:
- 16-QFN Exposed Pad
- Datasheet:
-
MMA5148LWR2.pdf
- Description:
- ACCELEROMETER 480G PCM/SPI 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,996
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Product details
Overview
MMA5148LWR2 from NXP Semiconductors (formerly Freescale) is a Z-axis PSI5-compatible inertial sensor designed for automotive crash detection systems. It delivers ±480g full-scale range, 10-bit digital output, 400 Hz low-pass filtering, and operates across -40°C to +125°C per AEC-Q100 Grade 1. Its primary role is high-g acceleration sensing in airbag control units.
For engineers reviewing the MMA5148LWR2 datasheet, MMA5148LWR2 pinout, MMA5148LWR2 application, or MMA5148LWR2 equivalent, key selection criteria include PSI5 v1.3 compliance, daisy-chain capability via BUS_SW, programmable time slots with 0.5 μs resolution, and ±480g overload robustness for front/side crash event capture.
Technical Context
The MMA5148LWR2 integrates an overdamped MEMS g-cell with a ΣΔ ADC, SINC filter, and digital signal processor supporting configurable LPF (3-pole or 4-pole) and HPF (0.04/0.1/0.3 Hz). Its internal 4 MHz oscillator drives timing-critical PSI5 communication and offset cancellation stages.
PSI5 interface operation includes selectable baud rates (125/190.5 kBaud), 8- or 10-bit data length, even parity or 3-bit CRC error detection, and optional external low-side daisy chain switching controlled by the BUS_SW terminal.
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 - Provides 1 LSB/g sensitivity at ±480g range for precise acceleration quantization. |
| PSI5 Compliance | Version 1.3 - Ensures interoperability with automotive PSI5 master controllers and supports time-slot programming. |
| Operating Temperature | -40°C to +125°C - Qualified to AEC-Q100 Grade 1 for under-hood and passenger compartment mounting. |
| Low-Pass Filter | Selectable 400 Hz, 3-pole or 4-pole - Suppresses high-frequency noise while preserving crash pulse fidelity. |
| Internal Oscillator | 4 MHz ±5% - Drives deterministic timing for PSI5 bit transmission, interpolation, and self-test sequencing. |
| Package | 16-pin QFN, 6 × 6 mm, case 2086-01 - Surface-mount footprint compatible with automotive PCB assembly and thermal management requirements. |
Pinout & Package
Pb-free 16-pin QFN (6 × 6 mm, case 2086-01) with exposed die attach pad internally connected to VSS. Thermal resistance θJC = 2.5°C/W enables reliable operation in high-temperature automotive environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | PSI5 Power & Data Line Supply | Receives power and bidirectional PSI5 communication via current modulation; requires external decoupling capacitor. |
| IDATA | PSI5 Response Current Output | Modulates sink current to encode acceleration data onto the PSI5 bus; supports 125/190.5 kBaud. |
| VBUF | Buffer Regulator Input | Supplies regulated 3.6–4.0 V to internal VREG/VREGA rails; provides EMC immunity and dropout resilience. |
| BUS_SW | Daisy Chain Switch Gate Drive | Drives external N-channel FET for PSI5 daisy chain topology; enables multi-sensor networks on single bus. |
| VREG / VREGA | Digital / Analog Supply Outputs | Provide stable 2.425–2.575 V for digital logic and analog signal chain; require external 1 μF ceramic capacitors. |
| VSS / VSSA | Digital / Analog Ground Returns | Separate ground paths minimize noise coupling between digital switching and analog sensor front-end. |
Key Features
| Feature | Design Value |
|---|---|
| PSI5 v1.3 Programmable Time Slots | 0.5 μs resolution enables precise synchronization of up to 32 sensors on one bus without timing collisions. |
| Overdamped Z-Axis MEMS Structure | Damping ratio ζ = 1.25–4.61 ensures minimal ringing during high-g crash events for clean pulse capture. |
| Fast Startup High-Pass Filter | 0.04 Hz HPF option allows rapid stabilization (<100 ms) after power-on for immediate crash readiness. |
| Self-Test with Quantified Output | Generates 12 LSB output during active self-test at ±480g range, enabling in-system functional verification. |
| Two-Wire Programming Mode | Enables OTP configuration (baud rate, data length, CRC) over PSI5 bus without additional SPI pins. |
Applications
| Airbag Front Crash Detection | Airbag Side Impact Detection |
|---|---|
Use Scenario: Mounted in vehicle dashboard or steering column to detect rapid deceleration during frontal collisions. IC Role / Device Role / Timing Role: Z-axis acceleration transducer feeding PSI5 data stream to airbag control unit (ACU) for real-time crash discrimination. Use Value: ±480g range prevents clipping during high-speed barrier tests; 400 Hz LPF preserves crash pulse rise time while rejecting road noise. | Use Scenario: Integrated into door modules or B-pillars to sense lateral acceleration during side-impact crashes. IC Role / Device Role / Timing Role: Single-axis inertial sensor providing time-aligned PSI5 output for ACU side-impact decision algorithms. Use Value: Daisy-chain support via BUS_SW reduces wiring harness complexity; AEC-Q100 Grade 1 ensures reliability in harsh cabin environments. |
| Occupant Classification System | Pre-Crash Sensing Module |
Use Scenario: Used alongside seatbelt pretensioner logic to distinguish adult vs. child occupancy based on low-g motion signatures. IC Role / Device Role / Timing Role: Low-noise Z-axis accelerometer supplying filtered 10-bit data for occupant weight/motion classification. Use Value: 1.0 LSB RMS noise (1–1 kHz) enables sub-0.5g motion detection; 0.04 Hz HPF supports slow-motion characterization. | Use Scenario: Embedded in forward radar or camera ECU to detect vehicle jerk preceding collision for pre-charge brake activation. IC Role / Device Role / Timing Role: High-bandwidth inertial sensor delivering low-latency PSI5 output for predictive safety actuation. Use Value: 16 μs internal sample rate with 1 μs interpolation reduces system latency; 2.5°C/W θJC sustains performance during extended ECU operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar inertial sensor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| NXP MMA5220LWR2 | ±240g full-scale range, identical PSI5 v1.3 interface and 16-pin QFN package. | Lower range suits moderate-impact zones (e.g., knee airbags); reduced overload margin vs. MMA5148LWR2. | Select when system-level crash testing confirms ≤±240g peak acceleration; retains same PCB layout and firmware. |
| Infineon XENSIV™ PAS1200 | PSI5 v1.3 compliant, ±500g range, but uses 12-pin TDFN and lacks BUS_SW daisy-chain drive. | Requires external switch for multi-sensor networks; higher g-range margin but no integrated low-side gate driver. | Choose for cost-sensitive designs where daisy chain is not required and board space is constrained. |
Compared with MMA5220LWR2 and PAS1200, the MMA5148LWR2 uniquely combines ±480g range, integrated BUS_SW daisy-chain control, and AEC-Q100 Grade 1 qualification in a single 16-pin QFN-enabling robust, scalable crash sensor networks without added discrete components.
Availability
MMA5148LWR2 is available at Aetrix Electronics and suitable for automotive airbag control units, occupant classification systems, and pre-crash sensing modules requiring stable component supply across extended production lifecycles.
Supply support for MMA5148LWR2 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.
The MMA51xxLW family was engineered specifically for PSI5-based automotive safety systems, emphasizing high-g survivability, deterministic timing, and seamless integration into distributed crash sensor architectures.
FAQ
What is the full-scale acceleration range of the MMA5148LWR2?
The MMA5148LWR2 has a factory-programmed full-scale range of ±480g. This is confirmed in the Ordering Information table and Electrical Characteristics section (Table 2, row 55), where sensitivity and clipping limits are explicitly specified for the ±480g variant. The device maintains linearity and avoids saturation during severe crash events typical in frontal and side-impact testing protocols.
Does the MMA5148LWR2 support daisy-chain configuration?
Yes, the MMA5148LWR2 supports PSI5 daisy chaining via its BUS_SW pin, which drives an external N-channel MOSFET to connect VSS to VSS_OUT. This capability is documented in the Features list ("Optional Daisy Chain with External Low-Side Switch") and Pin Description Table (Pin 15), and enables multiple MMA5148LWR2 sensors to share a single PSI5 bus without requiring additional master interfaces.
What is the operating temperature range qualified for the MMA5148LWR2?
The MMA5148LWR2 is qualified per AEC-Q100 Revision G, Grade 1, with an operating ambient temperature range of -40°C to +125°C. This specification is stated in the Features section and verified in Table 2 (row 20), ensuring suitability for under-hood and passenger compartment locations in automotive safety systems.
How does the MMA5148LWR2 handle power supply variations?
The MMA5148LWR2 employs a three-rail internal regulation architecture: VBUF (3.6–4.0 V) feeds independent VREG (2.425–2.575 V digital) and VREGA (2.425–2.575 V analog) supplies. Low-voltage detection thresholds (e.g., VCC_UV_F = 3.40 V) and hysteresis (0.10–0.40 V) prevent erratic behavior during brown-out conditions, as detailed in Table 2 rows 27–34.
Is the MMA5148LWR2 pin-compatible with other devices in the MMA51xxLW family?
Yes, all devices in the MMA51xxLW family-including MMA5148LWR2-share the identical 16-pin QFN package (case 2086-01) and pinout. The Ordering Information table confirms uniform package code "2086-01" across variants, and Figure 1's pin diagram applies universally. Functionally, only full-scale range and factory-configured parameters differ; hardware design and PCB layout are fully interchangeable.
MMA5148LWR2 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:
- Z
- Acceleration Range:
- ±480g
- Sensitivity (LSB/g):
- 1
- Sensitivity (mV/g):
- -
- Bandwidth:
- -
- Output Type:
- PCM, SPI
- Voltage - Supply:
- 4.2V ~ 17V
- Features:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QFN (6x6)
MMA5148LWR2 FAQ
1.How can I place an order for MMA5148LWR2 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMA5148LWR2 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 MMA5148LWR2 reliable?
The price and inventory of MMA5148LWR2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMA5148LWR2 is usually 5 days.
3.What payment methods are accepted for MMA5148LWR2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMA5148LWR2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMA5148LWR2?
MMA5148LWR2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMA5148LWR2 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 MMA5148LWR2?
For technical support, including MMA5148LWR2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMA5148LWR2 requirements.
6.How does Aetrix verify that MMA5148LWR2 is sourced from the original manufacturer or authorized distributors?
All MMA5148LWR2 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 MMA5148LWR2 meets industry standards.
7.What is the process for return or replacement of MMA5148LWR2?
All MMA5148LWR2 units undergo pre-shipment inspection (PSI). If there is an issue with MMA5148LWR2, 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 MMA5148LWR2 part is unused and in its original packaging.
Return procedure for MMA5148LWR2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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