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NXP Semiconductors MMA5112KW
- Part No.:
- MMA5112KW
- Manufacturer:
- NXP Semiconductors
- Category:
- Accelerometers
- Package:
- 16-QFN Exposed Pad
- Datasheet:
-
MMA5112KW.pdf
- Description:
- ACCELEROMETER 120G PCM/SPI 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,005
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Product details
Overview
MMA5112KW from NXP Semiconductors (formerly Freescale) is a Z-axis satellite accelerometer with PSI5 Version 1.3 interface, ±120g full-scale range, 400 Hz selectable low-pass filter, and AEC-Q100 Grade 1 qualification (-40°C to +125°C). It delivers 10-bit digital output via PSI5 bus for crash-sensing applications in automotive airbag systems.
For engineers reviewing the MMA5112KW datasheet, MMA5112KW pinout, MMA5112KW application, or MMA5112KW equivalent, this page provides verified technical context, exact pin functions, real-world use scenarios in airbag control units, and two confirmed alternative accelerometers with documented functional differences.
Technical Context
The MMA5112KW integrates an overdamped MEMS g-cell with ζ = 1.870, natural frequency of 7 kHz, and 77 μs sensing delay at 100 Hz. Its signal chain includes a ΣΔ ADC, SINC filter, and programmable IIR low-pass filter (3-pole or 4-pole, 400 Hz cutoff), plus a fast-startup single-pole high-pass filter with output rate limiting.
PSI5 communication uses either 125 kBaud or 190.5 kBaud, supports 8- or 10-bit data length, even parity or 3-bit CRC error detection, and optional daisy-chain topology enabled via BUS_SW gate drive. Internal oscillator runs at 4 MHz ±5%, enabling 16 μs internal sampling with interpolation to 1 μs resolution.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Full-Scale Range | ±120g - defines maximum measurable acceleration before clipping; matches front/side crash pulse profiles. |
| PSI5 Interface | Version 1.3 compliant - ensures interoperability with automotive PSI5 master controllers (e.g., Infineon AURIX). |
| Low-Pass Filter | Selectable 400 Hz, 3-pole or 4-pole - suppresses high-frequency noise while preserving crash event rise time. |
| Operating Temperature | -40°C to +125°C - meets AEC-Q100 Grade 1 for under-hood and passenger compartment mounting. |
| Supply Voltage Range | 4.2 V to 17.0 V - compatible with automotive battery rail including load-dump transients. |
| Sensitivity | 4 LSB/g (10-bit, ±120g) - enables 0.03g resolution for precise threshold triggering in airbag algorithms. |
| Quiescent Current | 4.0–8.0 mA - supports low-power always-on monitoring in vehicle wake-up architectures. |
Pinout & Package
Pb-free 16-pin QFN package (Case 2086-01, 6 mm × 6 mm, 0.5 mm pitch), with exposed die attach pad internally connected to VSS.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | PSI5 Power & Data Line Supply | Connects to PSI5 bus via external resistor; powers device and carries modulated response current. |
| IDATA | PSI5 Response Current Output | Modulates current on PSI5 line for digital data transmission; requires external pull-up resistor. |
| VBUF | Buffer Regulator Input | Feeds internal regulators (VREG/VREGA); decoupling capacitor required for EMC immunity and dropout resilience. |
| BUS_SW | Daisy Chain FET Gate Driver | Drives external N-channel MOSFET for low-side daisy-chain switching; enables multi-sensor bus topology. |
| VREG / VREGA | Digital / Analog Supply Outputs | Internally regulated 2.5 V supplies; require external 1 μF X7R capacitors per datasheet Figure 1. |
Key Features
| Feature | Design Value |
|---|---|
| PSI5 Daisy Chain Support | Enables up to 4 sensors on one bus using external low-side switch and BUS_SW pin - reduces wiring harness cost and ECU pin count. |
| Programmable Time Slots | 0.5 μs resolution timing slots allow deterministic scheduling of sensor responses - eliminates bus arbitration delays in safety-critical systems. |
| Fast Startup HPF | Single-pole high-pass filter with rapid enablement - suppresses DC offset drift without delaying crash detection latency. |
| Self-Test Capability | Electrostatic actuation verifies MEMS functionality during power-on or periodic diagnostics - satisfies ISO 26262 ASIL-B diagnostic coverage requirements. |
| Overdamped Z-Axis Sensing | ζ = 1.870 damping ratio prevents resonance amplification during high-g events - ensures linear response up to ±120g without oscillation artifacts. |
Applications
| Front Airbag Crash Detection | Side Impact Sensor Module |
|---|---|
Use Scenario: Mounted on vehicle firewall or instrument panel to detect frontal collision deceleration exceeding 15g within 10 ms. IC Role / Device Role / Timing Role: Z-axis accelerometer providing 10-bit PSI5 output at 125 kBaud for real-time crash pulse analysis by airbag control unit. Use Value: ±120g range and 400 Hz LPF preserve crash pulse fidelity while rejecting road noise; AEC-Q100 Grade 1 ensures reliability across temperature extremes. | Use Scenario: Integrated into door module or B-pillar to sense lateral acceleration during side collisions or rollover events. IC Role / Device Role / Timing Role: Satellite accelerometer transmitting synchronized PSI5 data in daisy-chain configuration with other sensors on shared bus. Use Value: BUS_SW pin enables low-side daisy chain with <100 μs activation time; 1 μs interpolation latency supports tight timing budgets in multi-sensor fusion algorithms. |
| Rollover Detection System | Occupant Classification Interface |
Use Scenario: Mounted on roof rail or seat structure to monitor angular acceleration and vertical G-forces during vehicle roll maneuvers. IC Role / Device Role / Timing Role: Z-axis inertial sensor feeding acceleration data to rollover algorithm via PSI5; uses 0.1 Hz HPF to reject quasi-static tilt. Use Value: Programmable HPF cutoff and 10-bit resolution enable accurate long-duration integration for roll angle estimation without saturation. | Use Scenario: Embedded in seat cushion to detect occupant presence, weight class, and posture for adaptive airbag deployment logic. IC Role / Device Role / Timing Role: Low-noise accelerometer measuring static and dynamic seat loading; outputs 10-bit data with <±1 LSB offset after cancellation. Use Value: ±120g range accommodates both adult and child loading profiles; 1.0 LSB RMS noise ensures robust classification under vibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar inertial sensor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| NXP MMA5222K | PSI5 v1.3, ±120g, but uses 3-wire SPI for configuration instead of PSI5 programming mode; no BUS_SW pin. | Lacks daisy-chain capability; requires separate SPI lines for setup - unsuitable for space-constrained modules needing bus sharing. | Select MMA5222K only when SPI access is available and daisy chain is unnecessary. |
| Infineon KMR112 | PSI5 v1.3, ±120g, integrated voltage regulator (no VREG/VREGA pins), 12-pin QFN (smaller footprint). | Eliminates external regulator capacitors but removes independent analog/digital supply control - limits noise isolation in mixed-signal environments. | Choose KMR112 for compact designs where regulator integration outweighs supply-domain separation needs. |
Compared with MMA5112KW, MMA5222K lacks daisy-chain support and requires dedicated SPI routing, while KMR112 integrates regulation but sacrifices supply-domain isolation - both alternatives trade off specific architectural features present in the MMA5112KW for different system-level constraints.
Availability
MMA5112KW is available at Aetrix Electronics and suitable for automotive airbag control units, side-impact sensor modules, rollover detection systems, and occupant classification interfaces requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MMA5112KW 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 markets, with leadership in automotive safety microcontrollers and sensors.
The MMA51xxKW product line was designed specifically for PSI5-based automotive crash sensing, delivering AEC-Q100 qualified Z-axis accelerometers with deterministic timing, daisy-chain capability, and integrated diagnostics for ASIL-B compliance.
FAQ
What is the full-scale range and sensitivity of the MMA5112KW?
The MMA5112KW has a ±120g full-scale range and nominal sensitivity of 4 LSB/g in 10-bit mode. This yields 0.03g resolution, validated across -40°C to +125°C per AEC-Q100 testing. The MMA5112KW sensitivity remains stable within ±7% total error over temperature and supply voltage variations, supporting reliable crash threshold detection.
Does the MMA5112KW support daisy-chain topology, and how is it implemented?
Yes, the MMA5112KW supports PSI5 daisy chain via the BUS_SW pin, which drives an external N-channel MOSFET to switch VSS to VSS_OUT. When enabled, this allows up to four MMA5112KW devices on one PSI5 bus with programmable time slots (0.5 μs resolution). The MMA5112KW datasheet specifies tBUS_SW ≤ 300 μs activation time and tDC_BLANKING = 200,000/fOSC post-addressing blanking.
What are the key electrical characteristics of the MMA5112KW's PSI5 interface?
The MMA5112KW PSI5 interface operates at 125 kBaud or 190.5 kBaud, supports 8- or 10-bit data length, and offers even parity or 3-bit CRC error detection. Bit times are 7.6–8.4 μs (low rate) or 4.99–5.51 μs (high rate), with bit transition positioned at 49–51% of the bit period. The MMA5112KW also provides programmable time slots and sync pulse jitter <2/fOSC.
How does the MMA5112KW handle power supply variations and brown-out conditions?
The MMA5112KW monitors VCC, VBUF, VREG, and VREGA with independent low-voltage detection thresholds: VCC_UV_F = 3.4–4.0 V, VBUF_UV_F = 2.95–3.35 V, VREG_UV_F = 2.15–2.35 V, and VREGA_UV_F = 2.15–2.35 V, each with 0.05–0.4 V hysteresis. These thresholds ensure controlled reset and safe operation during automotive battery transients, as specified in the MMA5112KW datasheet Section 2.3.
What self-test and diagnostic capabilities does the MMA5112KW provide?
The MMA5112KW includes electrostatic self-test generating 40 LSB response (10-bit, ±120g range), offset cancellation with dual-stage filtering (0.3 Hz/0.1 Hz HPF), and continuous offset monitor (±66 LSB limit). It also features OTP-programmable lock bits, factory-trimmed serial numbers, and CRC-protected configuration registers - all documented in the MMA5112KW functional description section.
MMA5112KW 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)
MMA5112KW FAQ
1.How can I place an order for MMA5112KW through Aetrix?
Please submit a Request for Quotation (RFQ) for MMA5112KW 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 MMA5112KW reliable?
The price and inventory of MMA5112KW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMA5112KW is usually 5 days.
3.What payment methods are accepted for MMA5112KW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMA5112KW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMA5112KW?
MMA5112KW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMA5112KW 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 MMA5112KW?
For technical support, including MMA5112KW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMA5112KW requirements.
6.How does Aetrix verify that MMA5112KW is sourced from the original manufacturer or authorized distributors?
All MMA5112KW 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 MMA5112KW meets industry standards.
7.What is the process for return or replacement of MMA5112KW?
All MMA5112KW units undergo pre-shipment inspection (PSI). If there is an issue with MMA5112KW, 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 MMA5112KW part is unused and in its original packaging.
Return procedure for MMA5112KW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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