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NXP Semiconductors MMA5112LW
- Part No.:
- MMA5112LW
- Manufacturer:
- NXP Semiconductors
- Category:
- Accelerometers
- Package:
- 16-QFN Exposed Pad
- Datasheet:
-
MMA5112LW.pdf
- Description:
- ACCELEROMETER 120G PCM/SPI 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,591
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Product details
Overview
MMA5112LW from NXP Semiconductors (formerly Freescale) is a Z-axis satellite accelerometer with PSI5 interface, ±120g full-scale range, 10-bit output resolution, AEC-Q100 Grade 1 qualification (-40°C to +125°C), and integrated 400 Hz 3-pole or 4-pole low-pass filter - used in automotive airbag crash detection systems.
For engineers reviewing the MMA5112LW datasheet, MMA5112LW pinout, MMA5112LW application, or MMA5112LW equivalent, this page delivers verified technical context, PSI5 timing parameters, sensor sensitivity (4 LSB/g), offset cancellation performance, and daisy-chain bus switch behavior - all critical for safety-critical automotive sensor integration.
Technical Context
The MMA5112LW implements a ΣΔ analog-to-digital converter with SINC filtering, followed by programmable IIR-based digital signal processing including selectable 3-pole or 4-pole low-pass filtering and a single-pole high-pass filter with fast startup. Its internal 4 MHz oscillator drives all timing-critical functions including PSI5 bit timing and interpolation.
PSI5 communication operates at either 125 kBaud or 190.5 kBaud with 8- or 10-bit data length, configurable error detection (even parity or 3-bit CRC), and programmable time slots resolved to 0.5 μs. Daisy chain operation is supported via BUS_SW pin driving an external low-side N-channel FET.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Full-Scale Range | ±120g - defines maximum measurable acceleration before clipping; matched to front/side crash pulse profiles. |
| Sensitivity | 4 LSB/g (10-bit output) - enables 30 mg/LSB resolution for precise crash severity classification. |
| PSI5 Baud Rate | 125 kBaud or 190.5 kBaud - determines minimum response latency (≤ 8.4 μs/bit at high rate) in safety-critical loops. |
| Low-Pass Filter | Selectable 400 Hz 3-pole or 4-pole - suppresses high-frequency noise while preserving crash pulse fidelity up to 200 Hz. |
| Operating Temperature | -40°C to +125°C (AEC-Q100 Grade 1) - ensures reliable operation under hood and cabin extremes. |
| Internal Sample Rate | 16 μs (62.5 kHz), interpolated to 1 μs - supports accurate timing of transient crash events with sub-microsecond timestamping. |
| Quiescent Current | 4.0–8.0 mA - enables low-power standby mode without compromising wake-up responsiveness. |
Pinout & Package
Pb-free 16-pin QFN package (6 mm × 6 mm, case 2086-01) with exposed thermal pad internally connected to VSS. Pin 17 (die attach pad) must be soldered to PCB ground plane for EMC immunity and thermal stability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | PSI5 Power & Data Line Supply | Supplies power via PSI5 bus; requires external decoupling capacitor (2.2 nF + 15 nF) and series resistor per Figure 1. |
| IDATA | PSI5 Response Current Modulation | Modulates current on shared PSI5 line for digital data transmission; supports daisy chain topology. |
| VBUF | Buffer Regulator Input | Feeds internal regulators (VREG/VREGA); provides supply dropout immunity and EMC robustness. |
| BUS_SW | Daisy Chain Low-Side Switch Driver | Drives gate of external N-MOSFET to connect VSS_OUT during multi-sensor daisy chain operation. |
| PCM | Test Output (4 MHz PCM) | Provides proportional pulse-code modulated signal for production test; disabled in application. |
| VREG / VREGA | Digital / Analog Supply Outputs | Internally regulated 2.5 V supplies; require 1 μF ceramic capacitors to VSS/VSSA respectively. |
| VSS / VSSA | Digital / Analog Ground | Separate ground returns minimize coupling between digital switching and analog sensing paths. |
Key Features
| Feature | Design Value |
|---|---|
| PSI5 v1.3 Compliance | Fully compliant with PSI5-P10P-500/3L; supports synchronous/asynchronous modes, programmable time slots, and CRC error detection. |
| Overdamped Z-Axis Sensing Element | Damping ratio ζ = 1.87 (±120g variant); eliminates resonance-induced measurement errors during high-g transients. |
| Offset Cancellation Architecture | Two-stage digital compensation reduces 10-bit offset to ±1 LSB (0.3 Hz HPF) - critical for zero-g baseline accuracy in mounting-tolerant systems. |
| Self-Test Capability | Active electrostatic self-test generates 40 LSB response (±120g range); validates sensor integrity without mechanical stimulus. |
| Robust Power Sequencing | Independent UVLO thresholds for VCC (3.4–4.0 V), VBUF (2.95–3.35 V), VREG/VREGA (2.15–2.35 V) prevent erratic behavior during supply ramp-up. |
Applications
| Front Airbag Crash Detection | Side Impact Sensor Module |
|---|---|
Use Scenario: Detects rapid deceleration (>20 g) during frontal collision to trigger airbag deployment within ≤30 ms. IC Role / Device Role / Timing Role: Z-axis satellite accelerometer providing primary crash signature to airbag control unit via PSI5 bus. Use Value: ±120g range and 400 Hz LPF match FMVSS 208 pulse requirements; AEC-Q100 Grade 1 ensures reliability across vehicle lifetime. | Use Scenario: Mounted in door or B-pillar to detect lateral acceleration during side impact or rollover. IC Role / Device Role / Timing Role: Dedicated Z-axis inertial sensor feeding real-time acceleration data to occupant classification system. Use Value: Overdamped mechanical design prevents false triggers from door slam or road noise; daisy-chain support reduces wiring harness complexity. |
| Rollover Detection System | Occupant Position Sensing |
Use Scenario: Monitors vertical-axis angular acceleration to identify vehicle roll rate exceeding threshold for curtain airbag activation. IC Role / Device Role / Timing Role: Satellite accelerometer reporting Z-axis dynamics to rollover algorithm running on main ECU. Use Value: 16 μs internal sampling and 1 μs interpolation enable precise roll-rate calculation; low-latency PSI5 interface meets ISO 26262 ASIL-B timing constraints. | Use Scenario: Integrated into seat structure to detect occupant presence, position, and weight for adaptive restraint control. IC Role / Device Role / Timing Role: High-stability Z-axis sensor measuring quasi-static load and dynamic motion simultaneously. Use Value: Digital offset cancellation maintains <±1 LSB baseline accuracy over temperature; 125 kBaud PSI5 allows multiplexing with other seat sensors on same bus. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar inertial sensor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| NXP MMA5212LW | Same ±120g range, PSI5 v1.3 interface, but adds embedded diagnostic monitoring and enhanced self-test coverage per ISO 26262. | Targeted for ASIL-B/C systems requiring higher diagnostic coverage; pinout and register map differ slightly. | Select MMA5212LW when functional safety certification (e.g., ISO 26262) is mandated; MMA5112LW remains optimal for cost-sensitive ASIL-A designs. |
| Analog Devices ADXL312W | 3-axis SPI/I²C accelerometer with ±120g range, but lacks PSI5 interface and AEC-Q100 Grade 1 qualification. | Requires external interface translation and additional qualification effort for automotive use; suited for industrial or non-safety systems. | Choose ADXL312W only for non-automotive applications or where PSI5 is not required; MMA5112LW provides native bus compliance and automotive qualification out-of-box. |
Compared with MMA5212LW and ADXL312W, the MMA5112LW delivers optimized cost-performance balance for ASIL-A airbag satellite nodes - retaining full PSI5 interoperability and AEC-Q100 qualification without added safety overhead or interface conversion complexity.
Availability
MMA5112LW is available at Aetrix Electronics and suitable for automotive airbag systems, occupant detection modules, and rollover protection systems requiring stable component supply across extended production lifecycles.
Supply support for MMA5112LW 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 MMA51xxLW product line was designed specifically for automotive safety-critical inertial sensing - delivering PSI5-compliant, AEC-Q100 qualified satellite accelerometers with overdamped Z-axis architecture for crash detection and occupant protection systems.
FAQ
What is the full-scale range and sensitivity of the MMA5112LW?
The MMA5112LW has a factory-configured full-scale range of ±120g and delivers 4 LSB/g sensitivity in 10-bit output mode. This yields a resolution of 30 mg/LSB, enabling precise discrimination of crash severity levels. The sensitivity value is confirmed in Table 52 of the datasheet and applies across the full operating temperature range (-40°C to +125°C).
Does the MMA5112LW support daisy-chain configuration via PSI5?
Yes, the MMA5112LW supports optional daisy-chain operation using its BUS_SW pin to drive an external low-side N-channel MOSFET. When enabled, this allows multiple MMA5112LW devices to share a single PSI5 bus with individual time-slot addressing. Configuration is performed via PSI5 programming commands, and the BUS_SW pin must remain unconnected if daisy chain is unused.
What are the key electrical characteristics of the MMA5112LW's PSI5 interface?
The MMA5112LW PSI5 interface supports two baud rates (125 kBaud and 190.5 kBaud), 8- or 10-bit data length, and selectable error detection (even parity or 3-bit CRC). Bit timing is specified at 7.6–8.4 μs (low rate) or 4.99–5.51 μs (high rate), with programmable time slots resolved to 0.5 μs - all verified per PSI5 v1.3 specification and documented in Section 2.6 of the datasheet.
How does the MMA5112LW handle power supply variations and undervoltage conditions?
The MMA5112LW features independent undervoltage lockout (UVLO) circuits for VCC (3.4–4.0 V), VBUF (2.95–3.35 V), and VREG/VREGA (2.15–2.35 V). These ensure orderly power-up sequencing and prevent erroneous outputs during brownout. Hysteresis values (0.1–0.4 V) are specified to avoid oscillation near threshold, and all UVLO behavior is validated per AEC-Q100 stress testing.
Is the MMA5112LW pin-compatible with other members of the MMA51xxLW family?
Yes, all MMA51xxLW variants - including MMA5106LW (±60g), MMA5112LW (±120g), MMA5124LW (±240g), and MMA5148LW (±480g) - share identical 16-pin QFN package (case 2086-01), pinout, and register map. Only the factory-programmed range bits (RNG[2:0]) and sensitivity differ; no PCB redesign is needed when scaling full-scale range within the family.
MMA5112LW 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:
- ±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)
MMA5112LW FAQ
1.How can I place an order for MMA5112LW through Aetrix?
Please submit a Request for Quotation (RFQ) for MMA5112LW 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 MMA5112LW reliable?
The price and inventory of MMA5112LW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMA5112LW is usually 5 days.
3.What payment methods are accepted for MMA5112LW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMA5112LW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMA5112LW?
MMA5112LW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMA5112LW 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 MMA5112LW?
For technical support, including MMA5112LW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMA5112LW requirements.
6.How does Aetrix verify that MMA5112LW is sourced from the original manufacturer or authorized distributors?
All MMA5112LW 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 MMA5112LW meets industry standards.
7.What is the process for return or replacement of MMA5112LW?
All MMA5112LW units undergo pre-shipment inspection (PSI). If there is an issue with MMA5112LW, 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 MMA5112LW part is unused and in its original packaging.
Return procedure for MMA5112LW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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