MMA5112KWR2 - ±120g Z-Axis PSI5 Accelerometer | NXP | 16-QFN
Teilenummer: MMA5112KWR2 ✗ Abgekündigt| Menge | Stückpreis | Gesamt |
|---|---|---|
| 1 | $18.5 | $18,50 |
| 10 | $16.2 | $162,00 |
| 100 | $13.85 | $1.385,00 |
| 500 | $11.4 | $5.700,00 |
| 1.000 | $9.75 | $9.750,00 |
MMA5112KWR2 Übersicht
An accelerometer is a micro-electromechanical (MEMS) sensor that converts linear acceleration into a proportional analog or digital output. Within the broader sensor hierarchy, the MMA5112KWR2 sits as: MEMS accelerometer -> inertial sensor -> motion sensor -> sensor IC -> semiconductor. PSI5 accelerometers are specifically designed for satellite (peripheral) nodes in automotive safety systems, communicating on a daisy-chained two-wire current loop that is robust against EMC and ground offset.
Key differentiating features include a ±120g measurement range, overdamped mechanical response (no resonance peak within the bandwidth), 4.2 V to 17 V supply range compatible with automotive 12 V bus systems, and an integrated PSI5 transceiver supporting standard PSI5 v1.3 frame formats. The overdamped architecture eliminates aliasing and spurious high-frequency excitation, making the part well-suited to crash detection and airbag pre-crash sensing where mechanical ringing would corrupt the deceleration profile.
The device uses NXP's high-aspect-ratio MEMS element with signal conditioning ASIC integrated in the same QFN package. The sensor element is hermetically sealed and factory-trimmed for sensitivity and offset, eliminating the need for external calibration. The PSI5 interface supports both 10-bit and 12-bit data widths, asynchronous and synchronous sampling modes, and X/Y/Z synchronization across multiple satellite nodes.
Typical applications include frontal airbag crash sensors, side-impact pre-crash detection, pedestrian protection satellite modules, and rollover detection in advanced airbag systems. The 6x6 mm QFN footprint is the standard footprint for PSI5 satellite accelerometers, enabling PCB layout reuse across a platform.
When designing with this device, ensure the PSI5 bus termination resistor and protection circuitry are correctly sized for the 12 V automotive battery environment, and observe AEC-Q100 thermal and vibration qualifications on the host PCB. The exposed thermal pad must be connected to ground for mechanical stability and thermal dissipation.
This page synthesizes distributor stock, AEC-Q100 qualification data, drop-in family-member alternatives, and PCB-level design notes for satellite airbag applications that are not consolidated on the manufacturer product page.
Drop-in-Alternativen für MMA5112KWR2 – gleiches Gehäuse, Pin-kompatibel. Bauteile mit anderem Gehäuse, die eine PCB-Überarbeitung erfordern, sind ausgeschlossen.
Varianten dieser Serie
Modelle derselben Serie, die drop-in-kompatibel sind mit MMA5112KWR2 (gleiche Bauform und Footprint) – abweichend in Axis, Mechanical Response, Output Interface, Package, Sensor Type.
Schnellvergleichstool – Wählen Sie Alternativbauteile für den Direktvergleich:
MMA5112KW
✅ Drop-In✓ Auf Lager
$5.1 / Stück
Datenblatt ansehen →MMA5124KWR2
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
MMA5106KWR2
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
MMA5112KW-R2
✅ Drop-In ⚠️ Spezifikationen ungeprüft📋 Referenzalternative (nicht im Katalog)
MMA5206KWR2
✅ Drop-In ⚠️ Spezifikationen ungeprüft📋 Referenzalternative (nicht im Katalog)
MMA5112KWR2 Grenzwerte & elektrische Eigenschaften
| Sensortyp | Accelerometer, single-axis Z-axis |
| Acceleration Range | ±120 g |
| Axis | Z (single) |
| Mechanical Response | Overdamped (no resonance peak) |
| Output Interface | PSI5 v1.3 (Peripheral Sensor Interface 5) |
| Supply Voltage Range | 4.2 V to 17 V |
| Data Resolution | 10-bit or 12-bit (PSI5 dependent) |
| Betriebstemperatur | -40 C to +125 C (automotive grade) |
| Gehäuse | 16-QFN EP (6x6 mm) |
| Package Code | HQCCN (per partstack data) |
| Montageart | Surface Mount |
| Qualification | AEC-Q100 (SafeAssure solution) |
MMA5112KWR2 Pin-Konfiguration
| Pin 1 | PSI5P — PSI5 positive data line (current-loop) |
| Pin 2 | NC — Not connected (per datasheet) |
| Pin 3 | VDD — Supply voltage 4.2 V to 17 V |
| Pin 4 | VSS — Ground reference |
| Pin 5 | NC — Not connected (per datasheet) |
| Pin 6 | TEST — Factory test pin (leave open in application) |
| Pin 7 | PSI5N — PSI5 negative data line (current-loop return) |
| Pin 8 | NC — Not connected (per datasheet) |
| Pin 9 | ADDR — PSI5 address select |
| Pin 10 | NC — Not connected (per datasheet) |
| Pin 11 | VSS — Ground reference |
| Pin 12 | NC — Not connected (per datasheet) |
| Pin 13 | VDD — Supply voltage 4.2 V to 17 V |
| Pin 14 | NC — Not connected (per datasheet) |
| Pin 15 | PSI5P — PSI5 positive data line (daisy-chain) |
| Pin 16 | PSI5N — PSI5 negative data line (daisy-chain) |
| Pin EP | EP — Exposed pad - connect to ground for thermal/mechanical |
Typische Anwendungen
MMA5112KWR2 ist geeignet für 6 Anwendungs: Frontal Airbag Crash Sensor, Side-Impact Pre-Crash Detection, Pedestrian Protection Satellite Module, Rollover Detection Satellite, Inertial Measurement in Chassis Control, Off-Road Vehicle Crash Detection.
Frontal Airbag Crash Sensor
The MMA5112KWR2's ±120 g full-scale range directly maps the deceleration envelope of a frontal crash event for airbag deployment decisioning. Its overdamped Z-axis mechanical response eliminates resonance-induced ringing that would otherwise corrupt the crash-pulse profile at the moment of algorithm-trigger evaluation. The PSI5 v1.3 interface allows it to daisy-chain with other satellite sensors (typically one per vehicle corner) over a single twisted pair to the central airbag ECU. Per the NXP MMA51xxWR2 datasheet, the 4.2 V to 17 V supply range accommodates cold-crank and load-dump events on the 12 V automotive battery without pre-regulation. This combination of g-range, overdamping, and PSI5 bus makes it the canonical satellite accelerometer for frontal airbag modules.
Empfohlen
Side-Impact Pre-Crash Detection
Side-impact crashes occur over much shorter time intervals than frontal crashes, requiring an accelerometer with low-latency, high-bandwidth response and a g-range matched to occupant-compartment intrusion kinematics. The MMA5112KWR2's overdamped design provides the clean pulse profile needed by side airbag ECUs to distinguish intrusion events from road-noise vibration. Its Z-axis orientation allows mounting on the B-pillar or door sill with the sensitive axis aligned to the lateral crash direction. The PSI5 v1.3 daisy-chain bus reduces wiring harness complexity versus discrete analog sensors, important for in-door mounting where harness routing is constrained. Per NXP documentation the part's -40 C to +125 C automotive temperature range supports door-mounted operation across all climates.
Empfohlen
Pedestrian Protection Satellite Module
Pedestrian-protection systems use forward-facing satellite accelerometers to detect bumper impact events and trigger hood lifter actuators within milliseconds. The MMA5112KWR2 provides the ±120 g range and overdamped response required to distinguish a pedestrian impact from road-bump noise. Its small 6x6 mm QFN footprint enables integration into compact bumper-mounted modules where PCB area is severely constrained. The PSI5 interface bus carries sensor data and diagnostic information over a single two-wire connection, simplifying the wiring harness to the central active-safety ECU. Per NXP SafeAssure positioning, the AEC-Q100 qualification supports the functional-safety case required by pedestrian-protection systems in Euro NCAP-rated vehicles.
Empfohlen
Rollover Detection Satellite
Rollover detection uses Z-axis accelerometers at multiple vehicle corners to compute vertical acceleration and infer rollover onset. The MMA5112KWR2's overdamped Z-axis response and ±120 g range make it suitable for mounting on the vehicle floor or A-pillar to measure vertical deceleration during roof-impact events. The PSI5 bus synchronizes multiple satellites at the central ECU so the rollover algorithm sees time-coherent data across all sensor nodes. The AEC-Q100 qualification with SafeAssure positioning supports the ASIL rating required for rollover curtain airbag deployment. Per the NXP MMA51xxWR2 datasheet, the device's PSI5 v1.3 protocol supports X/Y/Z synchronization across multiple satellite nodes.
Empfohlen
Inertial Measurement in Chassis Control
Beyond crash sensing, the MMA5112KWR2 serves in vehicle dynamics control modules that need a clean Z-axis acceleration reference for suspension and brake-control algorithms. The overdamped response ensures no spurious high-frequency components corrupt the low-frequency vehicle dynamics signal. The PSI5 v1.3 interface allows the same part to coexist on a shared bus with crash satellites, simplifying the vehicle network architecture. The -40 C to +125 C automotive temperature grade ensures operation in underbody and chassis-mounted locations. Per NXP documentation the device's signal conditioning ASIC provides factory-trimmed sensitivity and offset, eliminating field calibration.
Empfohlen
Off-Road Vehicle Crash Detection
Agricultural, construction, and military off-road vehicles experience higher g-load crash events than passenger cars due to terrain and operating conditions. The MMA5112KWR2's ±120 g range with overdamped response provides adequate headroom for these harsh-environment crash pulses while still resolving lower-amplitude events. The 16-QFN (6x6) package with exposed thermal pad supports mechanically demanding mounting conditions including high-vibration chassis locations. The PSI5 v1.3 protocol's current-loop interface is inherently robust against the EMC and ground-offset issues common in off-road vehicle electrical systems. Per NXP's AEC-Q100 qualification, the rover is qualified for the thermal and EMC demands of commercial-vehicle platforms.
Empfohlen
Zusammenfassung der empfohlenen Produkte
Technische Referenzdaten für MMA5112KWR2 – Vergleich, Designhinweise und Compliance-Informationen.
Auswahlhilfe
Vergleich mit Alternativen
| Parameter | Dieses Produkt | MMA5112KW | MMA5124KWR2 | MMA5106KWR2 | MMA5112KW-R2 | MMA5206KWR2 |
|---|---|---|---|---|---|---|
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Package | 16-QFN (6x6 mm) | 16-QFN (6x6) - same | 16-QFN (6x6) - same | 16-QFN (6x6) - same | 16-QFN (6x6) - same | 16-QFN (6x6) - same |
| Acceleration Range | ±120 g | ±120 g (same) | ±240 g (+100%) | ±60 g (-50%) | ±120 g (same) | ±60 g (-50%) |
| Axis | Z-axis | Z-axis (same) | Z-axis (same) | Z-axis (same) | Z-axis (same) | Z-axis (same) |
| Mechanical Response | Overdamped | Overdamped (same) | Overdamped (same) | Overdamped (same) | Overdamped (same) | Overdamped (same) |
| Interface | PSI5 v1.3 | PSI5 v1.3 (same) | PSI5 v1.3 (same) | PSI5 v1.3 (same) | PSI5 v1.3 (same) | PSI5 v1.3 (same) |
| Supply Voltage Range | 4.2 V to 17 V | 4.2 V to 17 V (same) | 4.2 V to 17 V (same) | 4.2 V to 17 V (same) | 4.2 V to 17 V (same) | 4.2 V to 17 V (same) |
Wichtigste Unterscheidungsmerkmale
- Pin-compatible across full g-range family (vs. MMA5106KWR2 / MMA5124KWR2)
- Overdamped Z-axis response eliminates resonance ringing (vs. Generic MEMS accelerometers)
- AEC-Q100 SafeAssure functional-safety positioning (vs. Industrial-grade MEMS accelerometers)
Designhinweise
The MMA5112KWR2 is designed to operate directly from the 12 V automotive battery bus (4.2 V to 17 V). Add a reverse-battery protection diode or P-MOSFET on the VDD line, and a unidirectional or bidirectional TVS to clamp load-dump transients above 35 V. Per NXP automotive design guidance, a 100 nF decoupling capacitor should be placed within 5 mm of each VDD pin, with a 10 uF bulk capacitor on the supply rail. The exposed thermal pad (EP) must be soldered to a ground pour for thermal dissipation and mechanical rigidity under vibration.
PSI5 bus layout is critical for EMC robustness. Use a twisted-pair cable from the satellite to the ECU, keep the cable length below the PSI5 specification maximum, and add a termination resistor on the ECU end of the bus as specified by the PSI5 v1.3 standard. Keep digital signals and switching power traces away from the PSI5 pair. The Z-axis sensing direction is normal to the PCB plane, so the PCB must be mounted with its plane oriented along the crash-sensitive axis per the system design.
The PSI5 current-loop interface is robust against ground-shift but is sensitive to bus capacitance. Excess capacitance from long cables or improper termination can degrade signal rise/fall times and cause communication errors. Measure PSI5 eye-diagram at the ECU receiver with the actual cable harness installed, and verify against the PSI5 v1.3 specification. For the MEMS sensor itself, the overdamped mechanical response means there is no resonance peak to worry about, but PCB-mounting stiffness affects high-frequency coupling of vibration into the sensor.
Common pitfalls include: (1) selecting the wrong family variant for the application g-range - undersizing saturates the output during a real crash; (2) forgetting to solder the exposed thermal pad which causes mechanical-flex failures under vibration; (3) failing to add TVS protection for load-dump which destroys the part during jump-start events; (4) mismatched PSI5 address selection on multi-satellite buses causing data collision. Always reference the NXP MMA51xxWR2 family datasheet for full application guidance and the SafeAssure functional-safety documentation for ASIL-rated systems.
Compliance-Informationen
AEC-Q100 and SafeAssure qualification confirmed per NXP datasheet. RoHS, REACH, lead-free, halogen-free status not stated in the provided web data and marked [DATA_NEEDED] in specs. Conflict-minerals compliance per NXP corporate policy.
