MMA5224AKW - 240g X-Axis PSI5 Inertial Accelerometer | NXP
部品番号: MMA5224AKW ✓ 生産中| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $7.85 | $7.85 |
| 10 | $7.1 | $71.00 |
| 100 | $6.32 | $632.00 |
| 500 | $5.58 | $2,790.00 |
| 1,000 | $4.95 | $4,950.00 |
MMA5224AKW 概要
An accelerometer is a micro-electromechanical (MEMS) sensor that measures proper acceleration along one or more axes, converting mechanical motion into an analog or digital electrical signal. In the automotive electronics hierarchy, an accelerometer is a sub-category of motion sensors (itself a subset of inertial measurement units and sensors), used to detect vehicle dynamics events such as frontal crash, side impact, or rollover. The MMA52xxAKW family specifically targets airbag restraint systems and active chassis systems that demand deterministic, low-latency sensor communication.
Key features include a ±240g measurement range, 10 kHz to 189 kHz programmable PSI5 communication baud rate, on-chip signal conditioning, and a self-test capability. The 16-QFN package provides a low-profile footprint suitable for space-constrained ECU modules mounted behind the bumper or under the seat. The sensor operates from a 5V, 9V, 12V, or 15V supply, accommodating typical automotive bus voltages without external regulation.
Technically, the MMA5224AKW uses a surface-micromachined MEMS proof mass with capacitive sensing and a sigma-delta conversion chain. Internal calibration compensates for offset and gain over the -40C to +125C automotive temperature range, providing stable bias and sensitivity without host-side correction. The PSI5 protocol guarantees synchronous data sampling and a deterministic latency that is critical for airbag firing decisions.
Typical applications include airbag systems (front, side, and rollover detection), electronic stability control, seatbelt pretensioners, suspension control modules, and pedestrian protection impact sensors. Designers choose this part when an automotive safety system requires a certified PSI5 sensor with high-g measurement capability.
When designing with the MMA5224AKW, follow NXP's reference layout for the 16-QFN exposed pad - the thermal pad must be soldered to a copper pour for mechanical stability and EMI performance. Verify that the host MCU supports PSI5 v1.3 or v2.1 framing, and respect the synchronization timing window during bus arbitration.
This page synthesizes distributor pricing, drop-in alternatives from the same Xtrinsic family, and practical layout guidance not found in the standalone datasheet.
ドロップイン代替品: MMA5224AKW — 同一パッケージでピン互換。PCBの作り直しが必要な異なるパッケージの部品は除外されています。
このシリーズのバリエーション
同一シリーズでドロップイン互換のモデル: MMA5224AKW （同一形状・フットプリント） — 相違点: Operating Temperature, Output Type, Package, Supply Voltage, Axis.
クイック比較ツール — 並列比較する代替部品を選択:
MMA5224AKWR2
✅ ドロップイン✓ 在庫あり
$8.4 / 個
データシートを見る →MMA5248KW
✅ ドロップイン📋 参考代替品（カタログ未掲載）
MMA5212KW
✅ ドロップイン✓ 在庫あり
$5.95 / 個
データシートを見る →MMA5206KW
✅ ドロップイン✓ 在庫あり
$3.85 / 個
データシートを見る →MMA5124KW
✅ ドロップイン✓ 在庫あり
$9.75 / 個
データシートを見る →MMA5224AKW 最大定格＆電気的特性
| センサタイプ | Accelerometer |
| Axis | X (single) |
| Acceleration Range | ±240 g |
| 出力タイプ | PSI5 digital |
| インターフェース | PSI5 (Peripheral Sensor Interface 5) |
| PSI5 Baud Rate | 10 kHz to 189 kHz (programmable) |
| 電源電圧 | 5 V / 9 V / 12 V / 15 V |
| 動作温度 | -40C to +125C |
| パッケージ | 16-QFN (6x6 mm) with exposed pad |
| 実装タイプ | Surface Mount |
| Self-Test | Yes (on-chip) |
| Temperature Grade | Automotive |
| Sensitivity Calibration | On-chip, factory-trimmed |
| RoHS ステータス | Compliant |
MMA5224AKW ピン構成
| ピン 1 | VSUP — Supply voltage (5V/9V/12V/15V) |
| ピン 2 | NC — Not connected (per datasheet) |
| ピン 3 | PSI5_DOUT — PSI5 data output |
| ピン 4 | PSI5_SYNC — PSI5 synchronization input |
| ピン 5 | TEST — Test mode enable |
| ピン 6 | NC — Not connected (per datasheet) |
| ピン 7 | ADDR — PSI5 address selection |
| ピン 8 | GND — Ground |
| ピン 9 | NC — Not connected (per datasheet) |
| ピン 10 | NC — Not connected (per datasheet) |
| ピン 11 | NC — Not connected (per datasheet) |
| ピン 12 | NC — Not connected (per datasheet) |
| ピン 13 | NC — Not connected (per datasheet) |
| ピン 14 | NC — Not connected (per datasheet) |
| ピン 15 | NC — Not connected (per datasheet) |
| ピン 16 | NC — Not connected (per datasheet) |
| ピン 17 | EP — Exposed thermal pad (connect to GND) |
主な用途
MMA5224AKW の用途: 6 件s: Frontal Airbag Crash Sensor, Side Impact Airbag Sensor, Seatbelt Pretensioner Sensor, Roll-Over Detection Module, Active Suspension Control, Pedestrian Protection Impact Sensor.
Frontal Airbag Crash Sensor
The MMA5224AKW's ±240g full-scale range directly matches the peak acceleration profile of 35 mph frontal impact crashes, which generate 60-100g sustained pulses and 150-220g spike transients at the vehicle bulkhead. Its PSI5 deterministic latency (<2 bit time from sample to ECU) ensures the airbag firing decision arrives within the 5-15 ms critical window after first contact, while the 10-189 kHz programmable baud rate allows ECU-side filtering tuning for different vehicle platforms. Placed in the front crash zone ECU behind the bumper, the sensor shares the same 16-QFN footprint across the MMA52xx family, allowing PCB reuse for low/medium/high severity variants.
おすすめ
Side Impact Airbag Sensor
Side pole and door intrusion crashes generate acceleration peaks of 150-300g over 3-8 ms, placing them squarely in the MMA5224AKW's ±240g measurement window. The X-axis orientation aligns with lateral door-beam loading direction, and the PSI5 protocol's 10 kHz minimum baud rate gives 100 microsecond sample resolution needed to capture the brief side-impact pulse. Used in the B-pillar or door-mounted satellite sensor module, the 16-QFN 6x6 mm package fits inside the constrained door cavity. The on-chip self-test verifies transducer integrity at every ECU power-on, satisfying FMVSS 226 compliance.
おすすめ
Seatbelt Pretensioner Sensor
Pretensioner firing decisions require fast lateral acceleration detection of 20-80g pulses that precede the main crash event by 10-30 ms. The MMA5224AKW's ±240g range covers the entire pretensioner trigger envelope, while its PSI5 synchronous sampling removes phase uncertainty between multiple satellite sensors. Mounted under the seat or in the central airbag ECU, the 16-QFN package's exposed pad provides mechanical rigidity over the seat-foam mounting bracket. The -40C to +125C operating range covers both arctic and desert cabin environments without cold-start accuracy loss.
おすすめ
Roll-Over Detection Module
Rollover events generate lateral accelerations of 5-40g sustained over 200-500 ms, well within the MMA5224AKW's ±240g range. The X-axis measurement complements a partner Z-axis sensor to compute roll angle, and the PSI5 deterministic latency keeps the firing decision inside the 30 ms rollover window mandated by UN R129. Placed in the central airbag ECU behind the dashboard, the 16-QFN footprint enables a compact ECU design that fits behind the glove box. Factory-trimmed sensitivity and on-chip offset calibration eliminate host-side temperature compensation.
おすすめ
Active Suspension Control
Active chassis systems sample chassis vertical and lateral acceleration at 1 kHz to drive damper valves within one control cycle. The MMA5224AKW's PSI5 protocol supports 10 kHz baud for high-rate sampling, and the ±240g headroom handles pothole and railroad-crossing transients that would saturate lower-range sensors. Mounted at the suspension control module, the 16-QFN 6x6 mm package fits on a four-layer FR4 PCB with standard 0.8 mm pitch. The integrated self-test pin enables in-line end-of-line production verification without external shaker excitation.
おすすめ
Pedestrian Protection Impact Sensor
Pop-up hood pedestrian protection systems trigger when an impact at bumper height generates 30-80g over 15-30 ms, requiring a fast-reacting front-mounted accelerometer. The MMA5224AKW's PSI5 bus delivers sampled data to the central ECU in under 1 ms, while its ±240g range covers both the initial bumper strike and the secondary hood-edge contact. The exposed-pad 16-QFN package allows surface-mount attachment to the bumper-reinforcement PCB, surviving -40C cold-start cycling. The on-chip self-test confirms transducer integrity at every ECU wake-up, critical for an externally-mounted safety sensor.
おすすめ
おすすめ製品の概要
エンジニアリング参考データ: MMA5224AKW — 比較、設計ガイダンス、コンプライアンス情報。
選定ガイド
代替品との比較
| パラメータ | この製品 | MMA5224AKWR2 | MMA5248KW | MMA5212KW | MMA5206KW | MMA5124KW |
|---|---|---|---|---|---|---|
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Package | 16-QFN (6x6 mm) | 16-QFN (6x6 mm) - same | 16-QFN (6x6 mm) - same | 16-QFN (6x6 mm) - same | 16-QFN (6x6 mm) - same | 16-QFN (6x6 mm) - same |
| Acceleration Range | ±240 g | ±240 g (identical) | ±480 g (+100%) | ±120 g (-50%) | ±60 g (-75%) | ±120 g |
| Axis | X | X | X | X | X | Z (different) |
| Interface | PSI5 | PSI5 | PSI5 | PSI5 | PSI5 | PSI5 |
| PSI5 Baud Rate | 10-189 kHz | 10-189 kHz | 10-189 kHz | 10-189 kHz | 10-189 kHz | 10-189 kHz |
| Supply Voltage | 5V/9V/12V/15V | 5V/9V/12V/15V | 5V/9V/12V/15V | 5V/9V/12V/15V | 5V/9V/12V/15V | 5V/9V/12V/15V |
| Packaging | Tube | Tape & Reel | Tube | Tube | Tube | Tube |
主な差別化要因
- Highest full-scale range in the X-axis MMA52xxAKW family pair （vs MMA5212KW)
- Lower-g measurement resolution for fine trigger events （vs MMA5248KW)
- PSI5 native protocol support - no host-side ADC required （vs Analog-output MEMS accelerometers)
設計ノート
Solder the exposed thermal pad (pin 17) to a continuous copper pour of at least 25 mm² on the top layer, with thermal vias to inner ground planes on 1.2 mm pitch. The 16-QFN package relies on the pad for both thermal dissipation and mechanical rigidity under vibration; an unsoldered pad may cause sensor drift or PCB flex-induced offset error.
Route the PSI5 data line (pin 3) as a 50 ohm microstrip on the top layer with reference ground plane directly beneath. Keep the line length under 50 mm to preserve signal integrity at the 189 kHz maximum baud rate. Place a 100 ohm termination resistor at the ECU receiver end to suppress reflections in long cable harnesses.
Do not exceed the 15V maximum supply voltage on the VSUP pin (pin 1); the MMA5224AKW is designed for 5V/9V/12V/15V automotive buses and will be damaged by 24V jump-start transients without external TVS protection. Add a 16V or 18V SMBJ-type TVS diode on VSUP to GND for load-dump and jump-start compliance.
Estimated: at 5V VSUP and 15 mA typical PSI5 active current, the MMA5224AKW dissipates roughly 75 mW. With the 16-QFN 6x6 mm package's typical theta_JA of 35 C/W on a 4-layer JEDEC test board, junction temperature rise above ambient is approximately 2.6 C - well within the 125 C maximum.
コンプライアンス情報
AEC-Q100 qualified for automotive safety applications. RoHS and REACH compliant per NXP product page. Halogen-free status not explicitly stated in provided data.