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NXP Semiconductors MMA5112KWR2
- Part No.:
- MMA5112KWR2
- Manufacturer:
- NXP Semiconductors
- Category:
- Accelerometers
- Package:
- 16-QFN Exposed Pad
- Datasheet:
-
MMA5112KWR2.pdf
- Description:
- ACCELEROMETER 120G PCM/SPI 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,126
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Product details
Overview
MMA5112KWR2 from NXP Semiconductors (formerly Freescale) is a Z-axis PSI5-compatible inertial sensor designed for automotive airbag crash detection systems. It delivers ±120g full-scale range, 400 Hz 3-pole or 4-pole low-pass filtering, and PSI5 v1.3-compliant 125/190.5 kBaud serial communication with 8- or 10-bit data length and programmable time slots at 0.5 μs resolution.
For engineers reviewing the MMA5112KWR2 datasheet, MMA5112KWR2 pinout, MMA5112KWR2 application, or MMA5112KWR2 equivalent, this page provides verified technical context, validated pin functions, confirmed automotive-grade operating conditions (−40°C to +125°C), and real-world substitution guidance for AEC-Q100 Grade 1 safety-critical deployments.
Technical Context
The MMA5112KWR2 integrates an overdamped MEMS g-cell with natural frequency of 7 kHz and damping ratio of 1.87, coupled to a ΣΔ ADC and digital signal processor implementing configurable SINC-based low-pass filters (3-pole or 4-pole) and a single-pole high-pass filter with fast startup. Its PSI5 interface supports both synchronous and asynchronous modes, daisy-chain topology via BUS_SW-controlled external FET, and two-wire programming using IDATA/VCC modulation.
Internal regulation includes independent analog (VREGA) and digital (VREG) supplies derived from VBUF, with built-in low-voltage detection on all rails and robust EMC immunity. The device uses OTP-programmable configuration registers for range, filter selection, baud rate, parity/CRC, and time slot assignment - all accessible over PSI5 without SPI pins in normal operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Full-Scale Range | ±120g - calibrated output range optimized for side-impact and front-crash acceleration detection in airbag control units. |
| PSI5 Compliance | Version 1.3 - supports P10P-500/3L timing, programmable time slots, 125/190.5 kBaud, and optional daisy chain. |
| Low-Pass Filter | Selectable 400 Hz 3-pole or 4-pole - suppresses high-frequency noise while preserving crash pulse fidelity for reliable event discrimination. |
| Operating Temperature | −40°C to +125°C - qualified per AEC-Q100 Rev G Grade 1 for under-hood and passenger compartment deployment. |
| Supply Voltage Range | VCC = 4.2 V to 17.0 V - compatible with automotive battery rail including load-dump transients up to +25 V. |
| Sensitivity | 4 LSB/g (10-bit mode) - enables precise digital acceleration quantization with <±7% total sensitivity error across temperature. |
| Internal Oscillator | 4 MHz nominal - drives all timing-critical functions including filter coefficients, interpolation, and PSI5 bit timing. |
Pinout & Package
Pb-free 16-pin QFN package (Case 2086-01, 6 mm × 6 mm, 0.5 mm pitch) with exposed thermal pad internally connected to VSS.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | PSI5 Power & Data Line Supply | Primary power input; supplies internal regulators and enables current-modulated PSI5 communication via IDATA. |
| IDATA | PSI5 Response Current Output | Modulates sink current onto VCC line for PSI5 data transmission; requires external series resistor per bus topology. |
| VBUF | Buffer Regulator Input | Stabilized intermediate supply feeding VREG (digital) and VREGA (analog); improves EMC immunity and dropout resilience. |
| VREG / VREGA | Digital / Analog Core Supplies | Internally regulated 2.5 V supplies; require external 500–1500 nF decoupling capacitors to VSS/VSSA respectively. |
| BUS_SW | Daisy Chain Gate Driver | Drives external N-channel MOSFET gate to enable VSS_OUT switching in multi-sensor daisy chains. |
| 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 |
|---|---|
| PSI5 v1.3 Programmable Time Slots | 0.5 μs resolution enables precise time-slot allocation in multi-node networks without bus arbitration overhead. |
| Overdamped Z-Axis Sensing Element | Damping ratio of 1.87 eliminates resonance-induced false triggers during high-frequency vehicle vibrations. |
| Interpolated 1 μs Sample Latency | 16 μs internal sampling interpolated to 1 μs effective latency - critical for accurate crash pulse edge detection. |
| Two-Wire PSI5 Programming Mode | Eliminates need for dedicated SPI interface; all configuration performed over standard PSI5 bus using IDATA/VCC. |
| AEC-Q100 Grade 1 Qualification | Validated for continuous operation at +125°C junction temperature - meets functional safety requirements for airbag ECUs. |
Applications
| Front-Crash Detection | Side-Impact Detection |
|---|---|
Use Scenario: Mounted behind radiator grille or front bumper to detect rapid deceleration during frontal collisions. IC Role / Device Role / Timing Role: Z-axis accelerometer providing real-time acceleration waveform to airbag ECU for crash severity classification and deployment timing. Use Value: ±120g range and 400 Hz LPF ensure accurate capture of 30–80 ms crash pulses while rejecting road noise and suspension harmonics. | Use Scenario: Integrated into door modules or B-pillars to sense lateral acceleration during T-bone or side-swipe impacts. IC Role / Device Role / Timing Role: Single-axis inertial sensor delivering synchronized PSI5 data to central airbag controller for side-curtain and seatbelt pretensioner activation. Use Value: Daisy-chain capability reduces wiring harness complexity; AEC-Q100 Grade 1 ensures reliability in harsh cabin environments. |
| Occupant Detection Support | Crash Pulse Validation |
Use Scenario: Used alongside seat sensors to distinguish between occupant presence and crash events in dual-stage airbag systems. IC Role / Device Role / Timing Role: High-fidelity acceleration measurement enabling differentiation between benign motions (e.g., seat adjustment) and crash signatures. Use Value: Low offset drift (<±1 LSB after cancellation) and <±2% non-linearity prevent false positives during low-g maneuvers. | Use Scenario: Deployed in validation rigs and crash-test sleds to record and verify airbag deployment timing against physical crash metrics. IC Role / Device Role / Timing Role: Reference-grade inertial sensor providing traceable, timestamped acceleration data for compliance reporting. Use Value: PCM test output and OTP-configurable parameters allow factory calibration traceability and post-deployment diagnostics. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar inertial sensing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| NXP MMA5212KWR2 | Same PSI5 interface, ±120g range, but adds integrated self-test actuator and enhanced offset monitoring. | Preferred where ISO 26262 ASIL-B diagnostic coverage is required; higher cost and larger footprint. | Select MMA5212KWR2 when functional safety certification and built-in self-test validation are mandatory. |
| Analog Devices ADXL312WBRMZ-RL | 3-axis SPI/I²C accelerometer, ±120g range, but lacks PSI5 interface and AEC-Q100 Grade 1 qualification. | Suitable for non-safety-critical industrial or test equipment; not approved for automotive airbag deployment. | Choose ADXL312WBRMZ-RL only for prototyping or non-automotive applications requiring multi-axis data. |
Compared with MMA5212KWR2, the MMA5112KWR2 offers lower system cost and smaller PCB footprint but lacks integrated self-test actuation. Against ADXL312WBRMZ-RL, it provides native PSI5 bus compatibility and full AEC-Q100 qualification - essential for production airbag ECUs.
Availability
MMA5112KWR2 is available at Aetrix Electronics and suitable for automotive airbag control units, crash event data recorders, and occupant classification systems requiring stable component supply across extended production lifecycles.
Supply support for MMA5112KWR2 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 markets.
The MMA51xxKW product line was engineered specifically for AEC-Q100-compliant PSI5-based inertial sensing in automotive safety systems - emphasizing robustness, deterministic timing, and fail-safe communication for airbag deployment decisions.
FAQ
What is the full-scale range and sensitivity of the MMA5112KWR2?
The MMA5112KWR2 has a full-scale range of ±120g and delivers 4 LSB/g sensitivity in 10-bit output mode. Total sensitivity error is bounded within ±7% across −40°C to +125°C and supply voltage variations. This specification is confirmed in Table 52 of the official MMA51xxKW datasheet (Rev. 11, 08/2012) and applies specifically to the MMA5112KWR2 variant.
Does the MMA5112KWR2 support daisy-chain configuration?
Yes, the MMA5112KWR2 supports optional daisy chaining via its BUS_SW pin, which drives an external low-side N-channel MOSFET to switch VSS_OUT. This functionality requires external hardware (M1 FET and R3 gate resistor) and PSI5 v1.3-compliant bus timing. The MMA5112KWR2 itself does not include integrated daisy-chain logic - it relies on external components as shown in Figure 1 of the datasheet.
What are the PSI5 communication options supported by the MMA5112KWR2?
The MMA5112KWR2 supports PSI5 v1.3 with selectable baud rates of 125 kBaud or 190.5 kBaud, data lengths of 8 or 10 bits, and error detection via even parity or 3-bit CRC. It also supports programmable time slots with 0.5 μs resolution and both synchronous and asynchronous response modes - all configurable via OTP registers over the PSI5 bus.
Is the MMA5112KWR2 qualified for automotive use?
Yes, the MMA5112KWR2 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. Its design includes low-voltage detection on VCC, VBUF, VREG, and VREGA rails, plus EMC-hardened regulation architecture - meeting requirements for safety-critical airbag deployment systems.
Can the MMA5112KWR2 be configured without using SPI pins?
Yes, the MMA5112KWR2 is designed for two-wire PSI5 programming mode: all configuration (range, filter, baud rate, time slots) is performed over the standard PSI5 bus using IDATA and VCC modulation. SPI pins (DIN, DOUT, SCLK, CS) are reserved for factory test only and must be left unconnected in application circuits per Table 1 of the datasheet.
MMA5112KWR2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- MMA
- Package/Case:
- 16-QFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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)
MMA5112KWR2 FAQ
1.How can I place an order for MMA5112KWR2 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMA5112KWR2 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 MMA5112KWR2 reliable?
The price and inventory of MMA5112KWR2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMA5112KWR2 is usually 5 days.
3.What payment methods are accepted for MMA5112KWR2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMA5112KWR2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMA5112KWR2?
MMA5112KWR2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMA5112KWR2 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 MMA5112KWR2?
For technical support, including MMA5112KWR2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMA5112KWR2 requirements.
6.How does Aetrix verify that MMA5112KWR2 is sourced from the original manufacturer or authorized distributors?
All MMA5112KWR2 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 MMA5112KWR2 meets industry standards.
7.What is the process for return or replacement of MMA5112KWR2?
All MMA5112KWR2 units undergo pre-shipment inspection (PSI). If there is an issue with MMA5112KWR2, 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 MMA5112KWR2 part is unused and in its original packaging.
Return procedure for MMA5112KWR2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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