MMA5212AKW - ±120g PSI5 X-Axis Accelerometer | NXP
Référence : MMA5212AKW ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $14.5 | $14,50 |
| 10 | $13.2 | $132,00 |
| 100 | $11.85 | $1 185,00 |
| 500 | $10.6 | $5 300,00 |
| 1 000 | $9.4 | $9 400,00 |
MMA5212AKW Présentation
Background: A PSI5 accelerometer is a peripheral satellite sensor (PSS) in an automotive restraint system that communicates over the PSI5 (Peripheral Sensor Interface 5) two-wire current-loop bus. It converts mechanical acceleration into a digital PSI5 frame that the central airbag ECU uses to decide when to deploy restraints. The hierarchy is: accelerometer -> inertial sensor -> motion sensor -> MEMS sensor -> semiconductor IC. The X-axis designation indicates single-axis sensing along one in-plane axis, making the device ideal for frontal or peripheral impact detection modules.
Key features include 16-bit data output representation, a sensitivity of approximately 0.244 mV/g (based on 120 g full-scale), a typical 5.0 V supply rail, and automotive-grade qualification (AEC-Q100). The overdamped mechanical transducer suppresses high-frequency vibration, eliminating aliasing noise before the digital PSI5 frame is transmitted. The 16-QFN (6 x 6 mm) HQCCN package provides a small PCB footprint suitable for tight satellite-module enclosures.
Technically, the device integrates a MEMS proof-mass transducer with a sigma-delta conversion chain and an embedded Manchester-coded PSI5 transceiver. Synchronization and data framing are managed by an on-chip state machine, and the part supports external sync pulses from the ECU for time-multiplexed multi-satellite configurations. Internal diagnostics and SafeAssure documentation assist ISO 26262 system integration at the ECU level.
Typical applications include front airbag satellite sensors, side-impact satellite modules, and pedestrian-protection satellite accelerometers that require a PSI5 interface. The automotive operating range and SafeAssure positioning also make it suitable for rollover detection satellite nodes.
When designing with the MMA5212AKW, ensure correct PSI5 bus termination per the PSI5 V1.3 specification, observe TVS protection on the two-wire interface, and follow NXP's recommended PCB footprint for the HQCCN-16 6 x 6 mm package. Refer to the manufacturer datasheet for the latest initialization timing diagrams and sync-modes table.
This page synthesizes distributor pricing, same-family PSI5 alternatives, and practical design notes not consolidated in the manufacturer datasheet.
Alternatives de remplacement direct pour MMA5212AKW — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Variantes de cette série
Modèles de la même série directement compatibles avec MMA5212AKW (même facteur de forme et même empreinte) — différant par Package, Axis, Output Interface, Sensor Type, Supply Voltage.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
MMA5206KW
✅ Remplacement direct✓ En stock
$3.85 / unité
Voir la fiche technique →MMA5224AKW
✅ Remplacement direct✓ En stock
$4.95 / unité
Voir la fiche technique →MMA5212KWR2
✅ Remplacement direct✓ En stock
$7.1 / unité
Voir la fiche technique →MMA5212AKW Valeurs maximales et caractéristiques électriques
| Type | Accelerometer, single axis (X) |
| Full-Scale Range | ±120 g |
| Axis | X (single axis) |
| Output Interface | PSI5 V1.3 asynchronous mode |
| Data Resolution | 16-bit |
| Supply Voltage Range | 4.2 V to 17 V |
| Mechanical Transducer | Overdamped X-axis MEMS |
| Plage de température de fonctionnement | -40 °C to +125 °C |
| Boîtier | 16-QFN (HQCCN), 6 x 6 mm |
| Type de montage | Surface Mount |
| Terminal Count | 16 |
| Package Code | HQCCN |
| Automotive Grade | AEC-Q100 qualified (SafeAssure) |
| Communication Protocol | PSI5 V1.3 (Manchester coded, two-wire current loop) |
| Family | Xtrinsic MMA52xxAKW |
Configuration des broches de MMA5212AKW
| Broche 1 | PSI5_DATA — PSI5 Manchester-coded two-wire data line |
| Broche 2 | NC — Not connected (per datasheet) |
| Broche 3 | VSS — Ground |
| Broche 4 | NC — Not connected (per datasheet) |
| Broche 5 | NC — Not connected (per datasheet) |
| Broche 6 | NC — Not connected (per datasheet) |
| Broche 7 | NC — Not connected (per datasheet) |
| Broche 8 | NC — Not connected (per datasheet) |
| Broche 9 | VDD — Supply voltage 4.2 V to 17 V |
| Broche 10 | NC — Not connected (per datasheet) |
| Broche 11 | NC — Not connected (per datasheet) |
| Broche 12 | NC — Not connected (per datasheet) |
| Broche 13 | ST — Self-test input |
| Broche 14 | NC — Not connected (per datasheet) |
| Broche 15 | NC — Not connected (per datasheet) |
| Broche 16 | EP — Exposed pad (thermal/ground) |
Applications typiques
MMA5212AKW convient pour 6 applications: Front Airbag Satellite Sensor, Side-Impact Satellite Accelerometer, Pedestrian-Protection Satellite Module, Rollover Detection Satellite Node, Pre-Crash Satellite Sensor, Multi-Satellite PSI5 Sensor Cluster.
Front Airbag Satellite Sensor
Mounted in the front bumper or crush zone, the MMA5212AKW measures frontal crash-pulse acceleration on the X axis and reports it over PSI5 V1.3 asynchronous Manchester-coded frames to the central airbag ECU. Its ±120 g range is well matched to typical high-speed frontal impact pulses that peak between 60 g and 100 g, leaving headroom without saturation. The 16-bit digital output gives the ECU fine resolution for crash-discrimination algorithms such as safing and deployment-threshold checks.
Recommandé
Side-Impact Satellite Accelerometer
Placed in the B-pillar or door cavity, the MMA5212AKW provides X-axis acceleration data to the airbag ECU for side-impact discrimination. The overdamped MEMS transducer attenuates high-frequency vibration that would otherwise alias into the deployment-decision band, improving discrimination of true side-impact events from door-slams and road noise. The 4.2 V to 17 V supply range tolerates 12 V automotive load-dump events that are common during a collision.
Recommandé
Pedestrian-Protection Satellite Module
Used in bumper-mounted pedestrian-impact satellite modules, the MMA5212AKW detects the lower-amplitude, faster-rising acceleration signature of a pedestrian strike versus a stationary curb impact. The 16-bit data path preserves the small-signal detail needed for shape-recognition algorithms, while PSI5 asynchronous mode keeps the bus cycle time predictable for ECU scheduling. The 6 mm x 6 mm HQCCN footprint fits easily inside space-constrained bumper pods.
Recommandé
Rollover Detection Satellite Node
Mounted on the chassis or roof rail as part of a rollover detection satellite network, the MMA5212AKW contributes X-axis acceleration to the ECU's roll-rate estimation. Although X-axis is the primary sensing axis, multiple satellites polled over PSI5 are fused in the ECU to compute angular rate. The ±120 g range covers free-fall and impact conditions encountered during a rollover event.
Recommandé
Pre-Crash Satellite Sensor
Used in pre-crash sensing pods that trigger reversible belt pretensioners or active headrests milliseconds before the main crash pulse, the MMA5212AKW's overdamped transducer keeps the high-frequency suspension and brake-torque noise out of the pre-crash decision band. Its PSI5 V1.3 asynchronous Manchester output is compatible with mainstream airbag ECUs that poll multiple satellites on the same two-wire loop.
Recommandé
Multi-Satellite PSI5 Sensor Cluster
The MMA5212AKW is one of several PSI5 V1.3 satellites wired to a common two-wire loop and time-multiplexed by the ECU sync pulse. Each satellite transmits Manchester-coded frames in its assigned time slot, and the overdamped X-axis response ensures that aliasing does not occur during fast crash events. This makes the device a building block for distributed restraint architectures such as front-center airbag systems.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour MMA5212AKW — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | MMA5206KW | MMA5224AKW | MMA5212KWR2 |
|---|---|---|---|---|
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Package | 16-QFN (6x6, HQCCN) | 16-QFN (6x6, HQCCN) - same | 16-QFN (6x6, HQCCN) - same | 16-QFN (6x6, HQCCN) - same |
| Full-Scale Range | ±120 g | ±60 g | ±240 g | ±120 g (same die) |
| Axis | X (single axis) | X (single axis) | X (single axis) | X (single axis) |
| Output Interface | PSI5 V1.3 asynchronous | PSI5 V1.3 asynchronous | PSI5 V1.3 asynchronous | PSI5 V1.3 asynchronous |
| Supply Voltage Range | 4.2 V to 17 V | 4.2 V to 17 V | 4.2 V to 17 V | 4.2 V to 17 V |
| Data Resolution | 16-bit | 16-bit | 16-bit | 16-bit |
| Mechanical Damping | Overdamped | Overdamped | Overdamped | Overdamped |
Principaux différenciateurs
- Mid-range ±120 g full-scale balances resolution and headroom (vs MMA5206KW)
- Higher digital resolution per g than higher-g same-family parts (vs MMA5224AKW)
- Identical die available in reel-packaged variant for production (vs MMA5212KWR2)
Notes de conception
Follow NXP's recommended PCB footprint for the HQCCN-16 6 x 6 mm package, including stitching vias around the central exposed pad for ground continuity and thermal dissipation. The exposed pad MUST be soldered to the PCB ground plane to meet automotive shock and vibration reliability requirements; an unsoldered EP can delaminate during a crash event.
The PSI5 two-wire current-loop interface requires the bus termination, sync resistor, and TVS clamp recommended in the NXP MMA52xxAKW datasheet. Place the TVS as close to the connector as possible and keep the loop traces short and parallel to maintain the bus impedance budget specified by PSI5 V1.3.
Do not assume the satellite can be hot-swapped on the PSI5 bus while the ECU is polling - the sync pulse assignment is fixed at ECU calibration time. Also avoid routing the PSI5 traces near high-current injector or coil-driver traces, since inductive transients can corrupt Manchester frames and trigger a sensor-fault state in the ECU.
Informations de conformité
Part of NXP SafeAssure functional-safety portfolio. AEC-Q100 qualified for automotive restraint applications. RoHS/REACH compliance per NXP product page.
