MMA5212KW - ±120g X-Axis PSI5 Satellite Accelerometer | NXP
MPN: MMA5212KW ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $9.85 | $9.85 |
| 10 | $8.95 | $89.50 |
| 100 | $7.85 | $785.00 |
| 500 | $6.95 | $3,475.00 |
| 1,000 | $5.95 | $5,950.00 |
MMA5212KW Overview
A satellite accelerometer is a single-axis MEMS sensor mounted at the periphery of a vehicle (e.g., door pillar, bumper reinforcement, or seat rail cross-member) that detects crash-pulse deceleration early in an event and reports it to a central airbag ECU over a two-wire current-loop PSI5 bus. The MMA5212KW belongs to the inertial sensor -> accelerometer -> MEMS accelerometer -> safety sensor taxonomy and is qualified to automotive-grade temperature ranges (-40C to +125C) with full AEC-Q100 conformance.
Key features include overdamped mechanical response (no resonance peak within the 400 Hz bandwidth), user-selectable 5V/9V/12V/15V supply rail (PSI5 V1.3 compliance), 11-bit output resolution plus optional 2-bit self-test/status, integrated diagnostics, and SafeAssure documentation. The exposed thermal pad (EP) provides a low-resistance thermal path to PCB copper, essential for reliable operation across automotive temperature extremes.
Typical applications include front and side impact satellite sensors, airbag ECU peripheral nodes, pedestrian protection bumper-mounted sensors, and seat rail occupant classification systems. The PSI5 Manchester-coded two-wire interface allows daisy-chaining of multiple satellites on one ECU input, simplifying wiring harness complexity.
When designing with this device, ensure the PSI5 current-loop termination resistor and blocking capacitor values follow the PSI5 V1.3 specification. The exposed pad must be soldered to a continuous PCB copper ground plane to meet the AEC-Q100 thermal-cycling and mechanical-shock reliability targets.
Drop-in alternatives for MMA5212KW — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with MMA5212KW (same form factor and footprint) — differing in Package, Sensor Type, Mounting Type, Supply Voltage, Acceleration Range.
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No drop-in alternatives available for this product.
Request AlternativesMMA5212KW Maximum Ratings & Electrical Characteristics
| Sensor Type | Accelerometer |
| Axis | X (single) |
| Full-Scale Range | ±120 g |
| Bandwidth | 400 Hz |
| Output Type | PSI5 digital (Manchester-coded, 11-bit) |
| Supply Voltage | 5 V / 9 V / 12 V / 15 V selectable |
| Mechanical Response | Overdamped (no resonance in 400 Hz BW) |
| Output Interface | PSI5 V1.3, AKLV27 compatible |
| Package | 16-QFN (6x6 mm) with exposed pad |
| Mounting Type | Surface Mount |
| Operating Temperature | -40 C to +125 C (automotive grade) |
| Self-Test | Integrated (2-bit status response) |
| AEC-Q100 | Yes (automotive-qualified) |
| RoHS Status | Compliant |
MMA5212KW Pin Configuration
| Pin 1 | PSI5_DATA — PSI5 Manchester-coded data I/O (current loop) |
| Pin 2 | NC — Not connected (per datasheet) |
| Pin 3 | NC — Not connected (per datasheet) |
| Pin 4 | GND — Ground reference |
| Pin 5 | NC — Not connected (per datasheet) |
| Pin 6 | NC — Not connected (per datasheet) |
| Pin 7 | NC — Not connected (per datasheet) |
| Pin 8 | NC — Not connected (per datasheet) |
| Pin 9 | NC — Not connected (per datasheet) |
| Pin 10 | NC — Not connected (per datasheet) |
| Pin 11 | NC — Not connected (per datasheet) |
| Pin 12 | NC — Not connected (per datasheet) |
| Pin 13 | NC — Not connected (per datasheet) |
| Pin 14 | PSI5_SYNC — PSI5 synchronisation input |
| Pin 15 | VSUP — Sensor supply (5V/9V/12V/15V selectable) |
| Pin 16 | EP — Exposed pad - thermal/ground (solder to PCB) |
Typical Applications
MMA5212KW is suitable for 6 applications: Front Impact Satellite Sensor, Side-Impact Door-Pillar Satellite, Pedestrian-Protection Bumper Sensor, Seat-Rail Occupant Classification Satellite, Rear-Impact Satellite Sensor, Off-Road and Heavy-Duty Vehicle Crash Sensing.
Front Impact Satellite Sensor
The MMA5212KW's ±120 g X-axis range and 400 Hz overdamped bandwidth make it ideal for front-impact satellite modules mounted in the engine compartment or radiator support. The overdamped response delivers a clean step-input representation of the crash pulse without ringing, so the central airbag ECU receives an accurate onset signature within the first 5-10 ms of impact - critical for airbag deployment timing. Its PSI5 V1.3 two-wire interface allows daisy-chaining multiple satellites on one ECU port, reducing harness weight and connector count.
Recommended
Side-Impact Door-Pillar Satellite
Mounted in the B-pillar or rocker, the MMA5212KW's ±120 g full-scale range accommodates severe side-pole impacts that routinely exceed 60 g within milliseconds, avoiding ADC saturation. The 400 Hz bandwidth captures the spectral content of door-intrusion crashes while rejecting road-noise and door-sl振动. The device's PSI5 Manchester-coded output allows two-wire daisy-chaining of B-pillar and rocker sensors on a single ECU input, simplifying per-side wiring. AEC-Q100 qualification ensures survival of door-environment temperature cycling.
Recommended
Pedestrian-Protection Bumper Sensor
The MMA5212KW serves as a bumper-mounted accelerometer for active hood and external airbag pedestrian-protection systems. Its overdamped mechanical response and 400 Hz bandwidth distinguish the brief, low-energy pedestrian-leg-impact pulse from road-vibration noise, while the ±120 g range covers run-over and cyclist-impact cases. The exposed thermal pad on the 16-QFN package handles the elevated underbody/bumper-beam thermal environment, and the PSI5 V1.3 daisy-chain interface minimises wiring across the bumper beam.
Recommended
Seat-Rail Occupant Classification Satellite
Inside the seat rail, the MMA5212KW's overdamped response and 400 Hz bandwidth provide a stable deceleration profile during pre-crash braking, supporting occupant-position classification algorithms that decide airbag deployment force. The PSI5 V1.3 Manchester-coded interface is intrinsically robust against EMI from the seat heater and seat motors. The 16-QFN (6x6 mm) package fits the confined seat-rail enclosure, and the device's -40 C to +125 C range survives cabin thermal cycling.
Recommended
Rear-Impact Satellite Sensor
Mounted in the rear parcel shelf or C-pillar, the MMA5212KW detects rear-impact crash pulses for active head-rest deployment and pretensioner triggering. The ±120 g full-scale range captures the rapidly rising rear-impact deceleration before the occupant's torso rebounds, giving the pretensioner system sufficient lead time. The PSI5 daisy-chain interface allows multiple rear-mounted units to share one ECU input, reducing wiring harness complexity in the rear of the vehicle.
Recommended
Off-Road and Heavy-Duty Vehicle Crash Sensing
Construction, agricultural, and mining vehicles use high-g crash sensors for rollover protection and operator-safety systems; the MMA5212KW's ±120 g X-axis range and 400 Hz overdamped bandwidth suit these applications. The AEC-Q100 automotive qualification, -40 C to +125 C operating range, and PSI5 V1.3 two-wire interface allow the MMA5212KW to be deployed alongside other vehicle electronics in harsh-duty environments. The 16-QFN exposed-pad package provides robust thermal dissipation for high-vibration mounting locations.
Recommended
Recommended Products Summary
Engineering reference data for MMA5212KW — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MMA5206KW | MMA5212AKW | MMA5224AKW | MMA5112KW | MMA5106KW |
|---|---|---|---|---|---|---|
| Package | 16-QFN (6x6) | 16-QFN (6x6) - same | 16-QFN (6x6) - same | 16-QFN (6x6) - same | 16-QFN (6x6) - same | 16-QFN (6x6) - same |
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Full-Scale Range | ±120 g | ±60 g | ±120 g | ±240 g | ±120 g (family-dependent) | ±60 g |
| Bandwidth | 400 Hz | 400 Hz | 400 Hz | 400 Hz | 400 Hz | 400 Hz |
| Mechanical Response | Overdamped | Overdamped | Overdamped | Overdamped | Overdamped | Overdamped |
| Output Interface | PSI5 V1.3 / AKLV27 Manchester | PSI5 V1.3 / AKLV27 Manchester | PSI5 V1.3 / AKLV27 Manchester | PSI5 V1.3 / AKLV27 Manchester | PSI5 V1.3 / AKLV27 Manchester | PSI5 V1.3 / AKLV27 Manchester |
| Supply Voltage | 5V / 9V / 12V / 15V selectable | 5V / 9V / 12V / 15V selectable | 5V / 9V / 12V / 15V selectable | 5V / 9V / 12V / 15V selectable | 5V / 9V / 12V / 15V selectable | 5V / 9V / 12V / 15V selectable |
| Operating Temperature | -40 C to +125 C | -40 C to +125 C | -40 C to +125 C | -40 C to +125 C | -40 C to +125 C | -40 C to +125 C |
| AEC-Q100 | Yes (SafeAssure) | Yes (SafeAssure) | Yes (SafeAssure) | Yes (SafeAssure) | Yes (SafeAssure) | Yes (SafeAssure) |
Key Differentiators
- Higher full-scale range within the same PSI5 satellite family (vs MMA5206KW)
- Lower full-scale range option within the same package (vs MMA5224AKW)
- SafeAssure functional-safety solution with ISO 26262 documentation (vs MMA5212AKW)
Design Notes
The exposed thermal pad (EP) of the 16-QFN package MUST be soldered to a continuous PCB copper ground plane to meet AEC-Q100 thermal-cycling and mechanical-shock reliability targets. Use an array of thermal vias under the EP to conduct heat into inner copper layers. The PSI5 current-loop data line should be routed as a differential pair with a ground guard, and the PSI5_SYNC trace should be kept short and shielded from the data line to avoid corrupting the Manchester-coded bit timing.
PSI5 is a current-loop protocol with Manchester-coded data; the loop termination resistor and blocking capacitor values MUST follow the PSI5 V1.3 specification (typically 100 ohm and 22 nF) to maintain signal integrity. Daisy-chaining multiple sensors on one ECU port requires each satellite to be assigned a unique time slot during the ECU's configuration phase. Verify timing budget with the NXP MC33789 or equivalent PSI5 host IC reference design.
Do not connect NC pins to PCB traces or to each other - they are reserved for factory test and may be bonded internally. Do not route high-current or switching signals (e.g., DC-DC converters, motor drive) near the PSI5 traces, as the high-energy transients can corrupt Manchester bit timing and cause false crash detection or missed events. Always power the sensor through the PSI5 bus supply rail configured by the ECU; do not supply the sensor from a separate unregulated rail.
Compliance Information
AEC-Q100 automotive qualified, SafeAssure functional-safety solution per NXP Xtrinsic MMA52xxWR2 datasheet. PSI5 V1.3 and AKLV27 protocol compatible.