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NXP Semiconductors MMA5112LCWR2
- Part No.:
- MMA5112LCWR2
- Manufacturer:
- NXP Semiconductors
- Category:
- Accelerometers
- Package:
- 16-QFN Exposed Pad
- Datasheet:
-
MMA5112LCWR2.pdf
- Description:
- ACCELEROMETER 120G PCM/SPI 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,312
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Product details
Overview
MMA5112LCWR2 from NXP Semiconductors is a Z-axis PSI5-compatible inertial sensor designed for automotive crash detection systems. It delivers ±120 g full-scale range, 10-bit digital output with ≤±7% total sensitivity error, 400 Hz selectable 3-pole or 4-pole low-pass filtering, and operates across -40 °C to +125 °C per AEC-Q100 Grade 1 qualification.
For engineers reviewing the MMA5112LCWR2 datasheet, MMA5112LCWR2 pinout, MMA5112LCWR2 application, or MMA5112LCWR2 equivalent, key selection criteria include PSI5 v1.3 compliance (125/190.5 kBaud, 8/10-bit data), daisy-chain capability via BUS_SW, fast startup high-pass filter, and integrated voltage regulation (VBUF/VREG/VREGA) for EMC robustness in safety-critical airbag ECUs.
Technical Context
The MMA5112LCWR2 implements a sigma-delta ADC with SINC filter and configurable DSP-based low-pass (400 Hz, 3- or 4-pole) and high-pass (0.04–0.3 Hz) filtering. Its internal 4 MHz oscillator drives interpolation to 1 μs timing resolution and supports programmable time slots with 0.5 μs resolution for precise PSI5 frame alignment.
PSI5 communication uses current modulation on IDATA with VCC powering the bus, supporting synchronous/asynchronous modes, even parity or 3-bit CRC error detection, and optional external low-side daisy chain switching controlled by BUS_SW. The device integrates independent analog/digital regulators (VREGA = 2.425–2.575 V, VREG = 2.425–2.575 V) fed from VBUF (3.6–4.0 V), enabling stable operation during supply transients.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Full-Scale Range | ±120 g - Enables front/side airbag deployment decisions without saturation under severe crash deceleration profiles. |
| PSI5 Compatibility | Version 1.3 - Supports standardized automotive sensor bus with programmable baud rates (125/190.5 kBaud) and error detection (even parity or 3-bit CRC). |
| Low-Pass Filter | Selectable 400 Hz, 3-pole or 4-pole - Configurable noise rejection while preserving crash-relevant frequency content up to ~300 Hz. |
| Operating Temperature | -40 °C to +125 °C - Qualified to AEC-Q100 Grade 1 for under-hood and passenger compartment mounting locations. |
| Supply Regulation | VBUF = 3.6–4.0 V, VREG/VREGA = 2.425–2.575 V - Dual regulated domains isolate analog sensing and digital logic from noisy PSI5 bus supply. |
| Digital Output | 10-bit resolution, ≤±7% total sensitivity error - Provides sufficient dynamic range and accuracy for calibrated crash pulse discrimination. |
| Self-Test Output | 40 LSB (±120 g range) - Enables in-system functional verification of signal chain integrity prior to vehicle deployment. |
Pinout & Package
Pb-free 16-pin QFN package, 6 mm × 6 mm × 1.98 mm, with exposed thermal pad internally connected to VSS.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | PSI5 Bus Power Input | Supplies power and carries modulated response current; requires external decoupling (2.2 nF + 15 nF) per datasheet. |
| IDATA | PSI5 Response Current Output | Modulates current onto VCC line for PSI5 data transmission; supports daisy-chain topology with external FET. |
| VBUF | Buffer Regulator Input | Feeds internal VREG/VREGA regulators; provides immunity against VCC dropouts and EMC disturbances. |
| BUS_SW | Daisy Chain Gate Driver | Drives gate of external N-channel FET to enable VSS_OUT switching in multi-sensor daisy chains. |
| VREG / VREGA | Digital / Analog Supply Outputs | Stable 2.5 V supplies for logic and sensor interface; each requires dedicated 1 µF ceramic capacitor to VSS/VSSA. |
| VSS / VSSA | Digital / Analog Ground | Separate ground returns minimize coupling between digital switching noise and analog acceleration measurement. |
Key Features
| Feature | Design Value |
|---|---|
| PSI5 v1.3 Compliance | Enables plug-and-play integration into existing automotive PSI5 master controllers without protocol translation. |
| Programmable Time Slots | 0.5 μs resolution allows precise scheduling of multiple sensors on shared bus, minimizing inter-sensor interference. |
| Fast-Startup High-Pass Filter | 0.04–0.3 Hz cutoff enables rapid stabilization after power-on, reducing system initialization latency in safety-critical applications. |
| Integrated Voltage Regulation | VBUF-fed dual regulators (VREG/VREGA) eliminate need for external LDOs, reducing BOM count and PCB area in space-constrained ECUs. |
| Overdamped Z-Axis Sensing Element | Natural frequency 7 kHz (±120 g range) with damping ratio 1.87 ensures minimal resonance amplification during crash events. |
Applications
| Front Airbag Crash Detection | Side Impact Sensor Module |
|---|---|
Use Scenario: Mounted on vehicle firewall to detect frontal collision deceleration exceeding deployment threshold. IC Role / Device Role / Timing Role: Z-axis accelerometer providing real-time acceleration waveform to airbag control unit for algorithmic crash severity classification. Use Value: ±120 g range and 400 Hz LPF ensure accurate capture of 0–300 Hz crash pulse energy while rejecting high-frequency noise from road vibration. | Use Scenario: Integrated into door module to sense lateral acceleration during side-impact collisions. IC Role / Device Role / Timing Role: PSI5 slave node transmitting synchronized acceleration data over daisy-chained bus to central ECU. Use Value: BUS_SW pin enables seamless daisy chaining with other MMA51xxL sensors, reducing wiring harness complexity and connector count. |
| Rollover Detection System | Occupant Classification Sensor |
Use Scenario: Mounted in roof rail to monitor vertical acceleration and angular rate proxies for rollover event prediction. IC Role / Device Role / Timing Role: High-stability Z-axis inertial sensor feeding low-latency data to rollover algorithm with <65 μs interpolation latency. Use Value: 16 μs internal sample rate interpolated to 1 μs timing resolution enables precise derivative-based roll-rate estimation. | Use Scenario: Embedded in seat structure to detect occupant presence, position, and weight class via static and dynamic acceleration signatures. IC Role / Device Role / Timing Role: AEC-Q100 qualified sensor delivering calibrated 10-bit output for ECU-based occupant classification logic. Use Value: ≤±7% total sensitivity error and factory-trimmed offset support reliable differentiation between adult, child, and empty seat states. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar inertial sensor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMA5112LCW | Tubes packaging vs. Tape & Reel; identical electrical and functional specs. | No difference in circuit design or performance; only logistics and assembly handling differ. | Select MMA5112LCW for manual prototyping or low-volume hand-soldered builds. |
| ADXL313WBRMZ-RL | I²C/SPI interface, ±0.5–±4 g range, no PSI5 support, 3.3 V single supply. | Requires host MCU with I²C/SPI and custom firmware; unsuitable for direct PSI5 bus replacement. | Choose ADXL313WBRMZ-RL only for non-automotive, low-g industrial motion sensing where PSI5 is not required. |
Compared with MMA5112LCW and ADXL313WBRMZ-RL, the MMA5112LCWR2 uniquely combines AEC-Q100 Grade 1 qualification, PSI5 v1.3 compliance, ±120 g range, and integrated dual-regulator architecture-making it the only option for production automotive crash detection systems requiring daisy-chain-capable, bus-powered inertial sensing.
Availability
MMA5112LCWR2 is available at Aetrix Electronics and suitable for front airbag crash detection, side impact sensor modules, and rollover detection systems requiring stable component supply, long-term automotive lifecycle support, and AEC-Q100-compliant traceability.
Supply support for MMA5112LCWR2 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.
The MMA51xxL product line delivers PSI5-compliant inertial sensors optimized for automotive safety systems-including airbag control units, rollover detection, and occupant classification-where functional safety, EMC resilience, and bus-level interoperability are mandatory.
FAQ
What is the full-scale acceleration range of the MMA5112LCWR2?
The MMA5112LCWR2 has a factory-programmed full-scale range of ±120 g. This range is fixed per device and confirmed in the DEVCFG1 register (RNG[2:0] = 011). It provides optimal signal-to-noise ratio and headroom for detecting crash pulses in front and side airbag applications without clipping under typical regulatory test conditions.
Does the MMA5112LCWR2 support daisy-chain configuration?
Yes, the MMA5112LCWR2 supports optional daisy chaining via the BUS_SW pin, which drives an external N-channel MOSFET to switch VSS_OUT. When enabled, this allows multiple MMA51xxL sensors to share a single PSI5 bus using programmable time slots. Daisy chain operation requires external hardware (M1 FET and R3 gate resistor) per Figure 1 in the datasheet.
What are the supported PSI5 data rates and formats for the MMA5112LCWR2?
The MMA5112LCWR2 supports two PSI5 baud rates: 125 kBaud and 190.5 kBaud, selectable via the BAUD bit in DEVCFG2. It transmits either 8-bit or 10-bit data frames, configurable via DATASIZE. Error detection is selectable between even parity or 3-bit CRC, set by the P_CRC bit.
How does the MMA5112LCWR2 handle power supply variations on the PSI5 bus?
The MMA5112LCWR2 uses a buffered regulator architecture: VCC powers the PSI5 bus but feeds VBUF, which in turn supplies independent VREG (digital) and VREGA (analog) regulators. This isolates sensitive analog sensing from VCC ripple and dropouts. Low-voltage detection thresholds (e.g., VBUF_UV_F = 2.95 V) trigger safe shutdown if regulation fails.
Is the MMA5112LCWR2 qualified for automotive use?
Yes, the MMA5112LCWR2 is qualified to AEC-Q100 Revision G, Grade 1 (-40 °C to +125 °C ambient), with full characterization across temperature, voltage, and lifetime stress tests. It is part of NXP's SafeAssure functional safety solution portfolio and intended for ASIL-B capable systems when integrated per ISO 26262 guidelines.
MMA5112LCWR2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- MMA
- Package/Case:
- 16-QFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Digital
- Axis:
- Z
- Acceleration Range:
- ±120g
- Sensitivity (LSB/g):
- 4
- 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)
MMA5112LCWR2 FAQ
1.How can I place an order for MMA5112LCWR2 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMA5112LCWR2 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 MMA5112LCWR2 reliable?
The price and inventory of MMA5112LCWR2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMA5112LCWR2 is usually 5 days.
3.What payment methods are accepted for MMA5112LCWR2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMA5112LCWR2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMA5112LCWR2?
MMA5112LCWR2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMA5112LCWR2 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 MMA5112LCWR2?
For technical support, including MMA5112LCWR2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMA5112LCWR2 requirements.
6.How does Aetrix verify that MMA5112LCWR2 is sourced from the original manufacturer or authorized distributors?
All MMA5112LCWR2 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 MMA5112LCWR2 meets industry standards.
7.What is the process for return or replacement of MMA5112LCWR2?
All MMA5112LCWR2 units undergo pre-shipment inspection (PSI). If there is an issue with MMA5112LCWR2, 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 MMA5112LCWR2 part is unused and in its original packaging.
Return procedure for MMA5112LCWR2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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