MMA7330LT - ±4g/±12g 3-Axis Analog Accelerometer | NXP | 14-LGA
MPN： MMA7330LT ✗ 停產MMA7330LT 概覽
An accelerometer is a micro-electromechanical (MEMS) sensor that measures linear acceleration by detecting the displacement of a proof mass relative to the device frame; this displacement is converted via capacitive sensing into an analog voltage. The MMA7330LT belongs to the MEMS accelerometer family within the broader sensor and motion-sensing taxonomy, which sits under inertial measurement units (IMUs). Its selectable g-range via the g-Select pin allows a single device to serve both high-resolution low-g applications (tilt, vibration, motion) and higher-g event detection.
Key features include selectable ±4g / ±12g dynamic range, 308 mV/g sensitivity at ±4g and 83.6 mV/g at ±12g (with g-Select), integrated 1-pole low-pass filter, on-chip temperature compensation, self-test capability, and 2.2 V to 3.6 V single-supply operation. The 14-LGA 3x5 mm footprint is designed for reflow-compatible hand-held and consumer assembly.
Architecturally, the part is a capacitive micromachined accelerometer with dedicated signal conditioning and a g-Select digital input that switches the internal gain between full-scale ranges. The conditioning path includes offset and temperature compensation calibrated at the factory, plus a self-test input that applies a known electrostatic force to verify sensor integrity.
Typical applications include HDD freefall detection, portable consumer electronics motion input, tilt and orientation sensing, vibration monitoring, and gaming or remote-control human-interface devices. In each case the analog voltage is digitized by the host MCU's ADC for further processing.
A key design consideration when laying out the MMA7330LT: orient the LGA package so the indicated acceleration axes (X, Y, Z) match the device coordinate system of the host board; misalignment produces cross-axis errors that cannot be calibrated away by software.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found on the manufacturer datasheet.
直接替換替代品，適用於 MMA7330LT — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： MMA7330LT （相同外形與佔位） — 差異在於 Package, Supply Voltage.
MMA7340LT
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
MMA7360L
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
MMA6331LR1
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
ADXL335BCPZ
✅ 直接替換📋 參考替代品（不在目錄中）
MMA7330LT 最大額定值與電氣特性
| Type | Accelerometer, 3-axis analog |
| Acceleration Range | Selectable ±4g or ±12g |
| 輸出類型 | Analog voltage |
| Sensitivity (±4g) | 289.5 mV/g to 326.5 mV/g (nominal 308 mV/g) |
| Sensitivity (±12g) | 75.2 mV/g to 91.9 mV/g (nominal 83.6 mV/g) |
| Bandwidth (X, Y axis) | 400 Hz |
| Bandwidth (Z axis) | 300 Hz |
| 供應電壓 | 2.2 V to 3.6 V |
| Self-Test | Yes (logic-level input) |
| g-Select | Yes (logic-level input) |
| Low-Pass Filter | Internal 1-pole |
| 封裝 | 14-LGA (3 x 5 mm) |
| 安裝類型 | Surface Mount |
| Sensor Technology | Capacitive micromachined (MEMS) |
MMA7330LT 腳位配置
| 腳位 1 | VDD — Supply voltage (2.2 V to 3.6 V) |
| 腳位 2 | GND — Ground |
| 腳位 3 | XOUT — X-axis analog output |
| 腳位 4 | YOUT — Y-axis analog output |
| 腳位 5 | ZOUT — Z-axis analog output |
| 腳位 6 | g-Select — Range select: 0 = ±4g, 1 = ±12g |
| 腳位 7 | Self-Test — Self-test enable (active high) |
| 腳位 8 | NC — Not connected (per datasheet) |
| 腳位 9 | NC — Not connected (per datasheet) |
| 腳位 10 | NC — Not connected (per datasheet) |
| 腳位 11 | NC — Not connected (per datasheet) |
| 腳位 12 | NC — Not connected (per datasheet) |
| 腳位 13 | NC — Not connected (per datasheet) |
| 腳位 14 | PAD — Exposed die-attach pad (ground) |
典型應用
MMA7330LT 適用於 7 應用s: Hard Disk Drive Free-Fall Detection, Portable Consumer Motion Interface, Tilt and Orientation Sensing, Vibration Monitoring, Sports and Activity Recorders, Appliance and White-Goods Drop Detection, Industrial Hand-Held Tools.
Hard Disk Drive Free-Fall Detection
The MMA7330LT's selectable ±12g range and 400 Hz X/Y bandwidth make it a proven choice for HDD free-fall protection, where the host controller must park the read heads within a few milliseconds of the laptop starting to drop. Used in the ±12g setting the 83.6 mV/g sensitivity provides enough g-profile resolution for a 1-2 g trigger threshold while keeping the analog output well within the host MCU ADC input range. The device's low 2.2-3.6 V supply matches typical HDD bridge supply rails and avoids the need for extra regulator stages. Compared with digital-output accelerometers the analog interface keeps BOM cost minimal on legacy HDD sub-assemblies. For modern SSD and NVMe designs the NXP MMA8451Q family is now recommended instead.
推薦
Portable Consumer Motion Interface
Handheld remotes, gaming controllers, and point-and-click input devices can use the MMA7330LT to convert tilt and shake gestures into user input. The selectable ±4g range gives 308 mV/g sensitivity, sufficient for sub-degree tilt estimation when integrated over time on the host MCU. The internal 1-pole low-pass filter limits high-frequency hand-jitter, producing a smooth output that can be sampled at a few hundred Hz by the device's host. Low current and 2.2 V operation extend battery life in portable designs, and the 14-LGA 3 x 5 mm footprint fits comfortably above the main PCB under the device enclosure.
推薦
Tilt and Orientation Sensing
When mounted in a fixed orientation, the MMA7330LT can act as a tilt or level sensor: the static 1 g output on each axis maps directly to sine and cosine of the installation angle. Operating in the ±4g range gives 308 mV/g, equivalent to roughly 17.5 mV per degree of tilt around the zero-g point, which a 10-bit ADC can resolve to better than 1 degree. Applications include HVAC vent positioning, solar panel alignment indicators, and electronic spirit levels. The on-chip temperature compensation keeps drift well below the resolution of typical tilt applications.
推薦
Vibration Monitoring
Industrial vibration sensing from 0 to several hundred Hz is well within the MMA7330LT's 400 Hz X/Y bandwidth and 300 Hz Z bandwidth, allowing simple FFT analysis for machine-health monitoring of fans, pumps, and small motors. The analog output can be AC-coupled into a host op-amp or directly digitized for vibration FFT on an MCU. The ±4g range handles most light industrial loads; the ±12g range captures higher-energy vibration such as unbalanced washing-machine spindles. The 14-LGA package mounts easily to a small sensor PCB with vibration isolation grommets.
推薦
Sports and Activity Recorders
Sports accessories such as golf-swing analyzers, jump-height meters, and pedometer-style devices leverage the MMA7330LT's 3-axis sensing and wide supply range to capture high-g events with simple analog sampling. The selectable range lets one device capture both the gentle tilt and the peak acceleration of a swing without mode-switching delays. The 14-LGA 3 x 5 mm package fits within the strap envelope of a wrist-worn device. For newer designs requiring lower power, NXP's digital MMA8450Q family is preferred.
推薦
Appliance and White-Goods Drop Detection
Appliances such as washing machines, dishwashers, and refrigerators use the MMA7330LT to detect door slams, drop events during transit, and rough handling that could damage the product before it reaches the consumer. Operated in the ±12g setting, the device captures high-shock events while still functioning for tilt and balance measurements. Its 14-LGA footprint is small enough for hidden internal mounting. The host can use self-test at power-on to confirm sensor integrity before each wash cycle.
推薦
Industrial Hand-Held Tools
Cordless drills, impact drivers, and other industrial tools can use the MMA7330LT to measure vibration exposure for operator safety logging (ISO-aligned hand-arm vibration assessment) and to detect event-based tool use. The 400 Hz X/Y bandwidth covers most tool vibration spectra. Selectable range allows the same device to measure low-amplitude idle vibration and peak impact events. The 2.2-3.6 V supply matches tool-battery management IC outputs directly without additional regulation.
推薦
推薦產品摘要
工程參考資料，適用於 MMA7330LT — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | MMA7340LT | MMA7360L | MMA6331LR1 | ADXL335BCPZ | LIS3DHTR |
|---|---|---|---|---|---|---|
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | Analog Devices | STMicroelectronics |
| Package | 14-LGA (3 x 5 mm) | 14-LGA (3 x 5 mm) - same family | 14-LGA (3 x 5 mm) - same family | 14-LGA (3 x 5 mm) - same family | 16-LFCSP (4 x 4 mm) | 16-LGA (3 x 3 mm) |
| Acceleration Range | ±4g / ±12g (selectable) | ±3g / ±11g | ±1.5g / ±6g | ±2g / ±8g | ±3g (fixed) | ±2g / ±4g / ±8g / ±16g (selectable) |
| Output Type | Analog voltage (ratiometric) | Analog voltage | Analog voltage | Analog voltage | Analog voltage | Digital I2C/SPI |
| Supply Voltage | 2.2 V to 3.6 V | 2.2 V to 3.6 V | 2.2 V to 3.6 V | 2.2 V to 3.6 V | 1.8 V to 3.6 V | 1.71 V to 3.6 V |
| Self-Test | Yes | Yes | Yes | Yes | No | Yes (digital) |
| Lifecycle Status | Obsolete | Obsolete | Obsolete | Obsolete | Active | Active |
主要差異化特點
- Selectable dual g-range on a single part (對比MMA7340LT)
- Wide 400 Hz X/Y bandwidth (對比ADXL335BCPZ)
- Self-test integrated for in-field verification (對比ADXL335BCPZ)
設計說明
Estimated: The 14-LGA package has no leads, so the pad finish should be ENIG or OSP to avoid oxidation during the reflow window. Place a 0.1 uF X7R decoupling capacitor within 3 mm of the VDD pad and a 10 uF bulk capacitor at the supply-rail entry. Keep high-speed digital traces (USB, switching regulators) away from the analog outputs to avoid coupled noise on the low-mV level signals. A grounded copper keep-out under the device body reduces thermal gradient across the MEMS structure.
Common pitfall when migrating between the MMA7330LT and the MMA7340LT / MMA7360L: the firmware has to be updated for the new sensitivity scale factor (308 mV/g vs ~440 mV/g vs 800 mV/g). Forgetting this re-scaling is the most frequent source of inaccurate g readings after a design refresh. Also, the g-Select logic polarity must be re-verified against the chosen part's datasheet, as the +/-12g and +/-6g settings may be reversed compared to the MMA7330LT.
The analog outputs are ratiometric to the supply voltage (typical scale factor drift <5% over supply and temperature). Always use the same supply rail that powers the host ADC as the ADC reference to keep the digital g reading accurate across supply variations. Drive the host ADC inputs through short PCB traces - typically <10 mm - and add an RC low-pass filter (1 kohm + 100 nF) at the ADC input to suppress MHz-bandwidth switching noise without affecting the 400 Hz sensor bandwidth.
合規資訊
RoHS and lead-free status inferred from NXP / Freescale product records; full compliance certificates should be requested at order time. AEC-Q100 grade not offered - for automotive use choose an AEC-Q100 qualified NXP part.
