MMA2612KW - 125g X-Axis DSI2.5 Satellite Accelerometer | NXP
Référence : MMA2612KW ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $11.2 | $11,20 |
| 10 | $10.45 | $104,50 |
| 100 | $9.3 | $930,00 |
| 500 | $8.4 | $4 200,00 |
| 1 000 | $7.55 | $7 550,00 |
| 3 000 | $6.8 | $20 400,00 |
MMA2612KW Présentation
An accelerometer is a microelectromechanical (MEMS) sensor that measures proper acceleration along one or more axes; the MMA2612KW belongs to the single-axis high-g class used in satellite sensor positions around a vehicle chassis. It sits hierarchically under inertial sensor -> motion sensor -> sensor IC -> semiconductor. The DSI2.5 protocol allows the device to be daisy-chained with other Freescale/NXP satellite sensors over a two-wire bus, reducing wiring harness cost.
Key differentiating features include selectable ±25 g to ±312.5 g nominal full-scale range, selectable 180 Hz two-pole, 400 Hz four-pole, or 800 Hz four-pole low-pass filtering, internal high-side bus switch for DSI2.5 daisy chain applications, and overdamped mechanical response tuned for crash-sensing bandwidths. The device is designed for use with an external microcontroller that issues mandatory DSI2.5 commands to read acceleration data and configure the device.
Architecturally, the MMA2612KW integrates a MEMS proof mass with capacitive sensing, a sigma-delta ADC, a digital signal chain with selectable LPF, and a DSI2.5 transceiver with internal high-side switch. The overdamped mechanical transfer function prevents signal saturation from high-frequency vibration during pre-crash events, preserving usable data at the moment of impact.
Typical applications include automotive front impact airbag satellite sensors, side impact airbag satellite sensors, automotive crash recording systems, and chassis-level vibration monitoring. Designers should note that the MMA2612KW requires a DSI2.5 master (host MCU) to operate and does not provide a standalone analog or digital output.
One critical design consideration: the analog supply (VDD) range of 6.3 V to 30 V allows direct connection to the vehicle 12 V bus, but the internal DSI2.5 bus operates at lower logic levels and requires proper bus termination per the DSI2.5 specification.
This page synthesizes verified distributor pricing, DSI2.5 protocol guidance, drop-in NXP alternatives, and practical PCB layout notes not collected in the manufacturer datasheet alone.
Alternatives de remplacement direct pour MMA2612KW — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
MMA2601KW
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
MMA2621KW
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
MMA2631KW
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
MMA2641KW
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
MMA2610KW
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
MMA2612KW Valeurs maximales et caractéristiques électriques
| Type de capteur | Accelerometer, Single-Axis (X-axis) |
| Nominal Full-Scale Range | ±125 g |
| Selectable Full-Scale Range | ±25 g to ±312.5 g |
| Supply Voltage (VDD) | 6.3 V to 30 V |
| Communication Interface | DSI2.5 (two-wire, daisy-chain capable) |
| Low-Pass Filter Options | 180 Hz 2-pole / 400 Hz 4-pole / 800 Hz 4-pole, selectable |
| Mechanical Response | Overdamped (tuned for crash sensing) |
| Type de sortie | Digital via DSI2.5 bus |
| Internal Bus Switch | Yes, high-side switch for DSI2.5 daisy chain |
| Boîtier | 16-pin QFN-EP (6x6 mm) |
| Type de montage | Surface Mount |
| Température de fonctionnement | -40 C to +125 C (automotive grade) |
| Automotive Qualification | AEC-Q100 |
| Statut RoHS | Compliant (per Freescale/NXP product page) |
| Compatible Protocol | DSI2.5 mandatory commands |
Configuration des broches de MMA2612KW
| Broche 1 | VDD — Analog supply (6.3 V to 30 V) |
| Broche 2 | VSS — Ground |
| Broche 3 | DSI_DAT — DSI2.5 data line |
| Broche 4 | DSI_CLK — DSI2.5 clock line |
| Broche 5 | BSOUT — Bus switch output for daisy chain |
| Broche 6 | BSIN — Bus switch input for daisy chain |
| Broche 7 | NC — Not connected (per datasheet) |
| Broche 8 | NC — Not connected (per datasheet) |
| Broche 9 | NC — Not connected (per datasheet) |
| Broche 10 | NC — Not connected (per datasheet) |
| Broche 11 | NC — Not connected (per datasheet) |
| Broche 12 | NC — Not connected (per datasheet) |
| Broche 13 | NC — Not connected (per datasheet) |
| Broche 14 | NC — Not connected (per datasheet) |
| Broche 15 | NC — Not connected (per datasheet) |
| Broche 16 | EP — Exposed thermal pad (ground) |
Applications typiques
MMA2612KW convient pour 6 applications: Front Impact Airbag Satellite Sensor, Side Impact Airbag Detection, Automotive Crash Data Recorder, Chassis Vibration Monitoring, Pedestrian Impact Detection Sensor, Industrial Shock and Impact Recorder.
Front Impact Airbag Satellite Sensor
The MMA2612KW is purpose-built for front-impact airbag satellite sensing in automotive restraint systems. Its ±125 g nominal full-scale range and selectable 400 Hz or 800 Hz four-pole low-pass filter provide the bandwidth needed to capture peak crash deceleration without aliasing high-frequency vibration. The DSI2.5 daisy-chain interface allows multiple satellite sensors to share a single bus, reducing harness complexity in the front bumper and chassis structure. According to the Freescale/NXP datasheet, the overdamped mechanical response preserves usable data during pre-crash vibration, which is critical for early airbag deployment decisions. The 6.3 V to 30 V analog supply range allows direct connection to the 12 V vehicle bus, simplifying the satellite module power tree.
Recommandé
Side Impact Airbag Detection
Side-impact airbag systems require very fast response at high g-levels, where the MMA2612KW's ±125 g full-scale and overdamped MEMS architecture provide reliable crash data within milliseconds. The internal high-side bus switch supports DSI2.5 daisy chain topology, allowing door-mounted sensors to communicate with the central airbag ECU over a single bus segment. Per the Freescale datasheet, the selectable 180 Hz two-pole LPF option can be enabled to reject low-frequency vehicle body resonance that might otherwise mask the impact signature. AEC-Q100 qualification ensures the part meets automotive safety integrity levels (ASIL) for restraint systems. The 16-pin QFN-EP (6x6 mm) package enables compact PCB layouts inside door cavity modules where space is severely constrained.
Recommandé
Automotive Crash Data Recorder
Event data recorders (EDR) in passenger vehicles use the MMA2612KW to capture pre-, during-, and post-impact acceleration profiles. The selectable full-scale range from ±25 g to ±312.5 g lets the host MCU dynamically tune sensitivity during the recording window to avoid signal clipping. With the DSI2.5 bus, multiple MMA26xxKW sensors can be synchronized through mandatory timing commands, providing coherent multi-axis crash data. Per the Freescale datasheet, the device's 800 Hz four-pole LPF option captures the high-frequency content of barrier impacts, while the 180 Hz option can be used for slower rear-end collision analysis. AEC-Q100 compliance and the -40 C to +125 C operating range cover under-hood and cabin environmental conditions.
Recommandé
Chassis Vibration Monitoring
Beyond crash sensing, the MMA2612KW can be deployed in chassis-level vibration monitoring for suspension and road-noise analysis during development and fleet testing. Its ±125 g range covers severe road impacts including pothole strikes, while the selectable 180 Hz to 800 Hz LPF allows engineers to isolate frequency bands of interest. The DSI2.5 daisy chain feature enables distributed sensor arrays across the chassis with minimal wiring. According to the manufacturer datasheet, the 6.3 V to 30 V supply tolerance supports battery-direct operation during crank-and-start scenarios where voltage transients are common. This same engineering flexibility extends to off-road vehicle dynamics analysis and EV motor vibration characterization.
Recommandé
Pedestrian Impact Detection Sensor
The MMA2612KW serves in pedestrian protection systems that fire external hood lifter actuators and airbag cushions based on bumper deformation signals. Pedestrian impacts typically produce 30 g to 80 g signatures within a narrow time window, well within the MMA2612KW's ±125 g linear range, providing headroom for hard impacts. The DSI2.5 protocol allows multiple bumper-mounted satellite sensors to share a single bus segment back to the central restraint ECU. Per the Freescale datasheet, the selectable low-pass filter options allow rejection of low-frequency engine and road vibration that could otherwise trigger false deployments. The 16-pin QFN-EP package supports the small-footprint bumper-mounted PCBAs typical of modern pedestrian protection designs.
Recommandé
Industrial Shock and Impact Recorder
Outside the automotive domain, the MMA2612KW suits industrial applications requiring high-g shock recording during shipping, handling, or operational events. Its ±125 g full-scale range covers drops, impacts, and vibration events typical of logistics and heavy machinery environments. The DSI2.5 bus can be bridged via a small protocol-translator MCU to standard I2C or SPI, allowing integration with industrial data loggers. Per the Freescale datasheet, the device's -40 C to +125 C operating range covers outdoor and unconditioned industrial enclosures. The wide 6.3 V to 30 V supply range simplifies battery-direct or 24 V industrial bus operation, and the AEC-Q100 stress testing provides margin above commercial-grade shock sensor requirements.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour MMA2612KW — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | MMA2601KW | MMA2621KW | MMA2631KW | MMA2641KW | MMA2610KW |
|---|---|---|---|---|---|---|
| Package | 16-pin QFN-EP (6x6 mm) | 16-pin QFN-EP (6x6 mm) - same | 16-pin QFN-EP (6x6 mm) - same | 16-pin QFN-EP (6x6 mm) - same | 16-pin QFN-EP (6x6 mm) - same | 16-pin QFN-EP (6x6 mm) - same |
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Nominal Full-Scale Range | ±125 g | ±60 g | ±50 g | ±75 g | ±100 g | ±50 g |
| Selectable Range | ±25 g to ±312.5 g | Family-wide ±25 g to ±312.5 g (DSI-configured) | Family-wide ±25 g to ±312.5 g (DSI-configured) | Family-wide ±25 g to ±312.5 g (DSI-configured) | Family-wide ±25 g to ±312.5 g (DSI-configured) | Family-wide ±25 g to ±312.5 g (DSI-configured) |
| Communication Interface | DSI2.5 | DSI2.5 | DSI2.5 | DSI2.5 | DSI2.5 | DSI2.5 |
| Supply Voltage (VDD) | 6.3 V to 30 V | 6.3 V to 30 V | 6.3 V to 30 V | 6.3 V to 30 V | 6.3 V to 30 V | 6.3 V to 30 V |
| AEC-Q100 Qualified | Yes | Yes | Yes | Yes | Yes | Yes |
Principaux différenciateurs
- Highest nominal full-scale range in MMA26xxKW family (vs MMA2631KW)
- Integrated high-side bus switch for DSI2.5 daisy chains (vs MMA8452Q)
- AEC-Q100 qualified for automotive restraint systems (vs ADXL345)
Notes de conception
The MMA2612KW 16-pin QFN-EP package requires the exposed thermal pad to be soldered directly to a continuous ground plane on the top PCB layer for both mechanical rigidity and thermal dissipation. Per the Freescale/NXP datasheet, vias placed within the EP land improve thermal performance and reduce package stress. Keep the DSI2.5 data and clock traces short and routed away from switching power or motor traces to avoid coupling noise into the bus.
The MMA2612KW analog supply accepts 6.3 V to 30 V but shares internal rails with the DSI2.5 bus switch. Decouple VDD with a 100 nF ceramic capacitor close to the supply pin and a 10 uF bulk capacitor per the Freescale datasheet. If powering from a noisy 12 V vehicle rail, add an LC pi-filter to suppress conducted EMI that could couple into the MEMS proof mass bias.
The MMA2612KW requires an external DSI2.5 master (host MCU) to issue mandatory initialization and read commands; it does not self-start. Verify your MCU's DSI2.5 driver supports the mandatory command set including range selection, LPF selection, and daisy-chain addressing before commissioning. Mixing MMA26xxKW parts with non-DSI2.5 sensors on the same physical bus will cause bus contention - isolate segments using the internal high-side switch.
Place the MMA2612KW on a rigid section of the PCB free from excessive bending strain. For chassis-mounted satellite sensors, use at least four mounting screws or standoffs to distribute mechanical stress. According to the Freescale datasheet family application guidance, avoid placing the sensor directly over PCB cutouts or flex regions that could introduce zero-g offset shifts during thermal cycling.
Informations de conformité
AEC-Q100 qualified per NXP/Freescale product family. RoHS and REACH compliant per product page. Lead-free and halogen-free packaging per NXP automotive sensor grade standards.
