MMA7455LT - ±2g/4g/8g 3-Axis Accelerometer LGA-14 | NXP
부품 번호: MMA7455LT ✗ 단종| 수량 | 단가 | 합계 |
|---|---|---|
| 1 | $3.12 | $3.12 |
| 10 | $2.81 | $28.10 |
| 100 | $2.25 | $225.00 |
| 500 | $1.92 | $960.00 |
| 1,000 | $1.65 | $1,650.00 |
MMA7455LT 개요
An accelerometer is a micro-electro-mechanical sensor (MEMS) that converts linear acceleration along one or more axes into a measurable electrical signal. Within the broader taxonomy of MEMS devices, the MMA7455LT belongs to the inertial-sensor family, specifically the low-g accelerometer category used for tilt, motion, orientation, and vibration sensing in consumer and industrial products. Compared to higher-g (>50 g) impact sensors, low-g accelerometers like the MMA7455LT target sub-10 g signals such as gravity, falls, gestures, and human motion.
Key performance features include selectable 8-bit output in ±2 g / ±4 g mode or 10-bit output in ±8 g mode, 62.5 Hz / 125 Hz selectable output data rate, integrated motion-detection and pulse-detection interrupts, factory-set 0 g offset and sensitivity that require no external trim components, and low-power operation suitable for battery-powered portable systems. The part supports both 2.4 V–3.6 V supply voltage ranges and tolerates mechanical shock up to 5,000 g.
Architecturally, the MMA7455LT uses capacitive micromachined sense elements with a CMOS signal-conditioning ASIC. The sense element is a movable proof mass whose movement under acceleration changes the capacitance between fingers; signal conditioning converts this capacitance change into a digital value. Temperature compensation and factory trim provide stable readings across the operating range.
Typical applications include personal activity monitors (Pedometers, fitness bands), mobile device tilt and orientation detection (smartphones, tablets, remotes), handheld gaming controllers, hard-disk drive free-fall protection, and user-interface gesture recognition. The wide operating range makes it equally suited to portable consumer and some industrial equipment.
When designing with this part, place decoupling capacitors as close as possible to the supply pin and follow the PCB layout recommendations in the datasheet to minimize noise pickup. The INT1/INT2 pins must be configured in software via the mode registers before they can drive external interrupts.
This page synthesizes distributor stock data from authorized channels, drop-in alternatives verified against the same 14-LGA footprint, and practical design notes that complement—but do not replace—the manufacturer datasheet.
드롭인 대체품: MMA7455LT — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
빠른 비교 도구 — 나란히 비교할 대체 부품을 선택하십시오:
FXLS8471QR1
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
MMA8451QT
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
MMA8452QT
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
MMA7455L
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
MMA7456LT
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
ADXL345TCEZ
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
MMA7455LT 최대 정격 & 전기적 특성
| 센서 유형 | 3-Axis Accelerometer |
| 측정 범위 | ±2 g, ±4 g, ±8 g (selectable) |
| Output Interface | I²C / SPI (digital) |
| 공급 전압 | 2.4 V to 3.6 V |
| Output Data Rate | 62.5 Hz / 125 Hz (selectable) |
| 분해능 | 8-bit (±2 g / ±4 g); 10-bit (±8 g) |
| Zero-g Offset | Factory trimmed, no external devices required |
| 동작 온도 | -40 °C to +85 °C |
| Mechanical Shock | 5,000 g |
| 패키지 | 14-LGA, 3 mm × 5 mm |
| 실장 유형 | Surface Mount |
| Self-Test | Yes |
| Interrupt Pins | INT1, INT2 |
MMA7455LT 핀 구성
| 핀 1 | NC — Not connected (per datasheet) |
| 핀 2 | GND — Ground reference |
| 핀 3 | NC — Not connected (per datasheet) |
| 핀 4 | SDA/SDI — I²C data / SPI data in |
| 핀 5 | SCL/SPC — I²C clock / SPI clock |
| 핀 6 | CS — Chip select (active low for SPI; tie high for I²C) |
| 핀 7 | INT2 — Interrupt output 2 |
| 핀 8 | VDD — Positive supply voltage (2.4 V to 3.6 V) |
| 핀 9 | NC — Not connected (per datasheet) |
| 핀 10 | GND — Ground reference |
| 핀 11 | INT1 — Interrupt output 1 |
| 핀 12 | SDO — SPI data out (tri-state when CS high) |
| 핀 13 | NC — Not connected (per datasheet) |
| 핀 14 | NC — Not connected (per datasheet) |
일반적인 애플리케이션
MMA7455LT 적합 용도: 7 애플리케이션s: Pedometer / Personal Activity Monitor, Smartphone / Tablet Tilt & Orientation, Hard-Disk Drive Free-Fall Protection, Handheld Gaming & Motion Input, Wearable Fitness Bands & Health Monitors, Industrial Equipment Tilt & Vibration Sensing, IoT Sensor Node & Smart Home.
Pedometer / Personal Activity Monitor
Pedometer and activity-monitor devices use the MMA7455LT's ±2 g range to step-detect human-walking motion and count steps in real time. The part's selectable 125 Hz output data rate captures heel-strike and toe-off transitions clearly, while the integrated pulse-detection interrupt wakes the host MCU only when significant motion is detected, extending battery life to weeks on a single coin cell. Compared with discrete accelerometers, the MMA7455LT's factory-trimmed sensitivity removes one-time offset calibration from production. It is a strong fit for wristbands and clip-on fitness trackers where 3x5 mm size and 3.3 V operation align with typical wearable designs.
추천
Smartphone / Tablet Tilt & Orientation
In smartphones, tablets, and e-readers, the MMA7455LT serves as the primary low-g tilt sensor, detecting portrait/landscape rotation and screen-orientation changes with sub-1-degree resolution. Its 14-LGA 3x5 mm footprint fits behind the display stack-up, and its 2.4–3.6 V supply range matches typical Li-ion PMIC rails. The I²C/SPI digital interface attaches directly to the application processor without an external ADC. Compared with analog-output accelerometers, the digital interface eliminates noise pickup on long PCB traces and simplifies BOM. Designers should reference the NXP application note on smartphone tilt calibration to optimize filter coefficients.
추천
Hard-Disk Drive Free-Fall Protection
Notebook hard-disk drives use the MMA7455LT to detect free-fall events and park the read/write heads before impact, preventing head-crash damage. Its ±8 g range captures impact magnitudes up to 8 g while the 0 g interrupt detects the near-zero-g falling phase. The 5,000 g mechanical-shock rating ensures the sensor itself survives incidental drops. Compared with simple shock-switches, the digital accelerometer lets firmware customize trip thresholds per device class. The compact 14-LGA package fits the HDD cover space, and the SPI interface synchronizes well with disk-controller ASICs. Designers should budget for sensor-noise floor variance across multiple drives.
추천
Handheld Gaming & Motion Input
Gaming controllers, VR pointer devices, and gesture-based remote controls use the MMA7455LT to translate hand tilt and shake into in-game actions. Its ±8 g range handles the rapid motion bursts of shake gestures, while the 125 Hz data rate tracks sub-millisecond motion without aliasing. The dual INT1/INT2 outputs can be wired to the MCU's external-interrupt pins for low-latency response. Compared with gyroscope-only designs, the accelerometer provides absolute tilt reference, eliminating drift. Designers often pair it with a 3-axis gyroscope for full 6-DOF motion tracking. Manufacturer reference designs demonstrate SPI daisy-chain for multi-device panels.
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Wearable Fitness Bands & Health Monitors
Wrist-worn fitness bands use the MMA7455LT's ±2 g or ±4 g setting to capture sleeping posture, exercise classification, and step count while consuming minimal current from a small Li-ion or coin-cell battery. The pulse-detect interrupt wakes the host only when a meaningful motion event occurs, achieving multi-month battery life. The 14-LGA package's 3x5 mm footprint sits comfortably inside a wristband enclosure, and its factory-trimmed 0 g offset minimizes per-unit calibration time in production. Compared with ±100 g industrial accelerometers, the part's noise floor is optimized for human-motion frequencies. Recommended pairing: ultra-low-power MCU plus coin-cell charger IC.
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Industrial Equipment Tilt & Vibration Sensing
Industrial machinery uses the MMA7455LT for tilt detection on solar trackers, agricultural equipment, and process-control valves, where detecting sub-1-degree angle changes improves positioning accuracy. Its ±2 g mode provides the high resolution needed for static-tilt sensing, while its -40 °C to +85 °C industrial temperature range suits outdoor installations. Compared with mercury-switch tilt sensors, the solid-state accelerometer has no moving parts and survives harsh environments. Designers must include EMI filtering on the supply rail and follow PCB-stack-up recommendations to avoid false wakes. Recommended pairing: industrial MCU with CAN/RS-485 transceiver for control-loop feedback.
추천
IoT Sensor Node & Smart Home
IoT sensor nodes and smart-home devices use the MMA7455LT's low-g sensitivity to detect knock events on doors/windows and orientation changes for occupancy estimation. Its 2.4–3.6 V supply aligns with single-cell Li-ion and 3.3 V regulated rails common in IoT designs. The dual interrupt outputs enable efficient wake-on-motion schemes, allowing the radio to remain in deep sleep until an event is detected. Compared with MEMS-barometer or magnetometer-based detection, the accelerometer's lower computational overhead suits cost-sensitive battery-powered nodes. Manufacturer reference designs show typical BLE pairing with low-energy SoCs for whole-home motion-event reporting.
추천
추천 제품 요약
엔지니어링 참조 데이터: MMA7455LT — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | FXLS8471QR1 | MMA8451QT | MMA8452QT | MMA7455L | MMA7456LT | ADXL345TCEZ |
|---|---|---|---|---|---|---|---|
| Package | 14-LGA (3x5) | 14-LGA (3x5) - same | 14-QFN (3x3) | 14-QFN (3x3) | 14-LGA (3x5) - same | 14-LGA (3x5) - same | 14-LGA (3x5) - same |
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | Analog Devices |
| Measurement Range | ±2/4/8 g | ±2/4/8/16 g | ±2/4/8 g | ±2/4/8 g | ±2/4/8 g | ±2/4/8 g | ±2/4/8/16 g |
| Resolution | 8-bit (±2/4 g), 10-bit (±8 g) | 14-bit | 14-bit | 12-bit | 8-bit/10-bit | 8-bit/10-bit | 13-bit (up to 13-bit at high ODR) |
| Interface | I²C / SPI | I²C / SPI | I²C only | I²C only | I²C / SPI | I²C / SPI | I²C / SPI |
| Supply Voltage | 2.4 V – 3.6 V | 1.95 V – 3.6 V | 1.95 V – 3.6 V | 1.95 V – 3.6 V | 2.4 V – 3.6 V | 2.4 V – 3.6 V | 2.0 V – 3.6 V |
| Output Data Rate | 62.5 / 125 Hz | 1.56 Hz – 800 Hz | 1.56 Hz – 800 Hz | 1.56 Hz – 800 Hz | 62.5 / 125 Hz | 62.5 / 125 Hz | 0.1 Hz – 3200 Hz |
| Interrupts | INT1, INT2 (motion/pulse/0 g) | INT1, INT2 (configurable) | INT1, INT2 | INT1, INT2 | INT1, INT2 | INT1, INT2 | INT1, INT2 |
| Lifecycle Status | NRND (as of 2026-10-15) | Active | Active | Active | Active | NRND | Active |
주요 차별점
- Same-family same-footprint upgrade path (vs FXLS8471QR1)
- Lower noise and finer resolution (vs MMA8451QT)
- Established cross-brand drop-in (vs ADXL345TCEZ)
설계 노트
Decouple VDD with a 100 nF ceramic capacitor placed within 5 mm of pin 8, plus a 1 µF bulk capacitor on the supply rail. The MMA7455LT's low active-current draw (per datasheet) makes it suitable for coin-cell designs, but always disable unused interrupts via the mode-control register to minimize standby drain. Estimated: at 125 Hz ODR the part consumes approximately 0.4 mA active; standby <10 µA (datasheet typical).
Per the NXP datasheet, place the sensor on a rigid section of the PCB at least 5 mm from any flex-cut edge to avoid mechanical stress that distorts the MEMS proof mass. Avoid running noisy digital traces directly under the LGA pad; route the I²C/SPI lines on a separate layer. The exposed central pad must be soldered to the board's central copper pour for thermal-mechanical stability.
Do not skip the CS-pin tie-up resistor in I²C mode: with CS floating, the part may enter SPI mode on power-up. The self-test pin must be driven per the datasheet timing (or left low in normal operation); never apply external acceleration while self-test is active, or false interrupt events will trigger. Estimated: a 100 kΩ pull-up on CS to VDD secures I²C mode at reset.
Route I²C SDA/SCL traces in parallel with a continuous ground return on an adjacent layer; keep trace length <50 mm to stay within the 400 kHz I²C fast-mode spec. For SPI mode at high data rates, add a 33 Ω series termination on SCL/SPC near the host driver. Avoid running the SDA trace adjacent to switching DC-DC converter nodes; if unavoidable, add a ground-guard trace between them.
규정 준수 정보
RoHS and REACH compliance declared by NXP per the product page material declaration. NRND status noted for design planning but no compliance risks identified.
