MMA7340LR1 - ±3g/±11g 3-Axis Analog Accelerometer | NXP
MPN： MMA7340LR1 ✓ 啟用中MMA7340LR1 概覽
An accelerometer (also called a g-sensor) is a MEMS (Micro-Electro-Mechanical Systems) motion sensor that converts linear acceleration into an electrical signal. The MMA7340LR1 belongs to the MEMS accelerometer product family, which sits within the broader hierarchy of motion sensors -> inertial measurement units -> position/velocity sensors. Capacitive micromachined accelerometers use a suspended proof mass whose deflection changes the capacitance between interdigitated comb fingers; this capacitance change is then converted to a voltage by on-chip ASIC signal conditioning.
Key features of the MMA7340LR1 include a g-Select input (logic low for ±11g, logic high for ±3g) that lets the host trade sensitivity for dynamic range, a self-test input that verifies mechanical and electrical integrity at power-up, a hardware-controlled Sleep mode that drops current to a few microamps for battery-powered applications, and a factory-trimmed zero-g offset that eliminates external trim components. The 1-pole low-pass filter limits bandwidth-induced noise on the analog output.
The MMA7340LR1 uses an analog voltage output architecture (one ratiometric VOUT pin per axis) rather than a digital interface such as SPI or I2C. This makes it directly compatible with any ADC-equipped microcontroller without requiring a digital protocol stack, while still being immune to most digital bus noise. The g-Select pin allows the same PCB to support both a sensitive low-g mode (for tilt/inclinometer use) and a high-g mode (for shock/vibration capture).
Typical applications include handheld device tilt and orientation detection, free-fall detection for hard-disk drive protection, motion-activated user interfaces, vibration and tilt monitoring in industrial equipment, fitness and activity monitors, and gaming controller motion input.
When designing with this part, place the device near the PCB center to minimize centroid offsets, route the analog outputs over a quiet ground plane, and add an RC anti-alias filter between the sensor and the host ADC. The 3x5 mm LGA requires reflow soldering; the exposed pad on the underside should be soldered to the board ground plane for thermal dissipation and mechanical stability.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, giving an engineer a single decision-ready reference.
直接替換替代品，適用於 MMA7340LR1 — 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： MMA7340LR1 （相同外形與佔位） — 差異在於 Acceleration Range, Operating Temperature, Output Type, Package, Sensor Type.
MMA7340LC
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
MMA7330LR1
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →MMA7350LR1
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
MMA7360LR1
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →MMA7450LR1
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
MMA7340LR1 最大額定值與電氣特性
| 感測器類型 | 3-Axis Capacitive MEMS Accelerometer |
| Acceleration Range | ±3g, ±11g (selectable via g-Select) |
| 輸出類型 | Analog voltage (one VOUT per axis) |
| Bandwidth (X, Y axes) | 400 Hz |
| Bandwidth (Z axis) | 300 Hz |
| Filter | 1-pole low-pass |
| Self-Test | Yes (logic-level input) |
| Sleep Mode | Yes (logic-level input) |
| 供應電壓 | 2.2 V to 3.6 V (typical 3.3 V) |
| 工作溫度 | -40 C to +85 C |
| 封裝 | 14-LGA (3 x 5 mm) |
| 安裝類型 | Surface Mount |
| RoHS 狀態 | Compliant |
| Lead-Free Status | Lead Free |
MMA7340LR1 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: high = +/-3g, low = +/-11g |
| 腳位 7 | SLEEP — Sleep mode enable (active high) |
| 腳位 8 | Self-Test — Self-test input |
| 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 | NC — Not connected (per datasheet) |
典型應用
MMA7340LR1 適用於 6 應用s: Handheld Device Tilt and Orientation Detection, Hard-Drive Free-Fall Detection, Motion-Activated User Interface, Vibration and Tilt Monitoring in Industrial Equipment, Fitness and Activity Monitor, Gaming Controller Motion Input.
Handheld Device Tilt and Orientation Detection
The MMA7340LR1 measures gravity vector components along X, Y, Z axes to derive device pitch and roll in handheld electronics. With the g-Select pin set to ±3g mode, the sensor delivers maximum sensitivity around 1 g, ideal for tilt accuracy. The three ratiometric analog outputs connect directly to the host MCU's three ADC channels without any digital protocol overhead, keeping firmware simple. Bandwidths of 400 Hz (X, Y) and 300 Hz (Z) exceed tilt-response needs, while the integrated 1-pole low-pass filter suppresses mechanical vibration noise on the analog rails.
推薦
Hard-Drive Free-Fall Detection
Drop-detection in notebook hard-disk drives requires an accelerometer with millisecond response and self-test verification at power-up. The MMA7340LR1's self-test pin allows the HDD controller to confirm MEMS integrity every time the drive powers on, while g-Select set to ±11g captures high-impact shock events without saturating. The Sleep pin lets the drive quiesce the sensor when not needed, dropping system standby current. The 14-LGA (3x5 mm) footprint sits inside the HDD lid without disturbing the head stack assembly.
推薦
Motion-Activated User Interface
Tap and gesture interfaces in remote controls and wearables use the MMA7340LR1's wide ±11g range to capture sudden acceleration events without clipping. The Sleep mode reduces idle current for coin-cell designs, while wake-on-motion can be implemented by polling the analog outputs or feeding them to an MCU interrupt-capable ADC. Factory-calibrated zero-g offset means no host-side offset compensation is required across production units, simplifying gesture algorithm tuning.
推薦
Vibration and Tilt Monitoring in Industrial Equipment
Industrial tilt and vibration monitoring leverages the MMA7340LR1's 400 Hz X/Y bandwidth and 1-pole on-chip filter to capture machinery health data with minimal external filtering. The ratiometric analog outputs ride cleanly above switching-converter noise when the PCB layout keeps the analog ground island intact. Operating temperature of -40 C to +85 C covers most factory-floor enclosures. The wide ±11g range handles peak vibration events on conveyor belts and pumps without signal saturation.
推薦
Fitness and Activity Monitor
Wrist-worn step counters and pedometers rely on the MMA7340LR1 to detect repetitive motion signatures in the 1-3 Hz band, well within the X/Y 400 Hz bandwidth. The small 3x5 mm LGA footprint fits inside a wristband module, and the 2.2-3.6 V supply range allows direct connection to a Li-ion battery without LDO overhead. Sleep mode minimizes quiescent current during sedentary intervals, extending battery life by an order of magnitude versus always-on operation.
推薦
Gaming Controller Motion Input
Motion-controlled gamepads use the MMA7340LR1 to translate wrist motion into gameplay input. With g-Select in ±3g mode, fine pointer movements are resolved at maximum sensitivity; switching to ±11g in firmware captures aggressive gesture swings without saturating the analog outputs. The hardware-controlled Sleep mode extends the battery life of wireless controllers between sessions, while the self-test input verifies MEMS integrity at each power-on event.
推薦
推薦產品摘要
工程參考資料，適用於 MMA7340LR1 — 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 | MMA7340LC | MMA7330LR1 | MMA7350LR1 | MMA7360LR1 | MMA7450LR1 |
|---|---|---|---|---|---|---|
| Package | 14-LGA (3x5 mm) | 14-LGA (3x5 mm) - same | 14-LGA (3x5 mm) - same | 14-LGA (3x5 mm) - same | 14-LGA (3x5 mm) - same | 14-LGA (3x5 mm) - same |
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Acceleration Range | +/-3g, +/-11g (selectable) | +/-3g, +/-11g (selectable) - identical | +/-4g (fixed) | +/-3g, +/-11g (selectable) | +/-1.5g, +/-6g (selectable) | +/-2g, +/-4g, +/-8g (selectable, digital) |
| Output Type | Analog (X, Y, Z VOUT) | Analog - identical | Analog | Analog | Analog | Digital I2C/SPI |
| Self-Test | Yes | Yes | Yes | No | No | Yes |
| Sleep Mode | Yes | Yes | Yes | Yes | Yes | Yes |
| Supply Voltage | 2.2 V to 3.6 V | 2.2 V to 3.6 V - identical | 2.2 V to 3.6 V | 2.2 V to 3.6 V | 2.2 V to 3.6 V | 2.4 V to 3.6 V |
| X/Y Bandwidth | 400 Hz | 400 Hz - identical | 400 Hz | 400 Hz | 400 Hz | 250 Hz (digital configurable) |
主要差異化特點
- Selectable dual measurement range via g-Select pin (對比MMA7330LR1)
- Integrated self-test for power-on verification (對比MMA7350LR1)
- Analog interface eliminates digital firmware overhead (對比MMA7450LR1)
設計說明
Place the MMA7340LR1 near the geometric center of the PCB to minimize the rotational moment arm between the sensor and the product's reference frame. The exposed pad on the underside of the 14-LGA package must be soldered to a ground pad on the top layer for mechanical rigidity and thermal dissipation; missing this connection can cause MEMS offset drift under thermal cycling. Keep high-speed digital traces (USB, switching converters) at least 5 mm away from the analog output traces, and route the analog outputs over a continuous ground pour.
Decouple VDD with a 0.1 uF ceramic capacitor placed within 3 mm of the supply pin. For applications where the analog outputs feed a high-impedance ADC, add a 10 nF ceramic capacitor in parallel to filter switching-noise spurs from upstream regulators. Because the analog outputs are ratiometric to VDD, route the sensor supply from a low-noise LDO (such as NXP's MMG3014 family) and use the same rail as the host ADC reference to preserve absolute-g accuracy across load variations.
Add a first-order RC anti-aliasing filter on each analog output before the host ADC. A typical choice is 1 kohm series + 1 nF to ground, yielding a 159 kHz cutoff that comfortably exceeds the 400 Hz X/Y bandwidth while suppressing wideband noise. For free-fall detection with sub-millisecond response, lower the RC to 100 ohm + 100 pF for a 1.6 MHz cutoff. Always sample the analog outputs at >=2x the filter cutoff to satisfy Nyquist.
Do not float the g-Select, Sleep, or Self-Test pins - each must be tied to a defined logic level (VDD or GND) for predictable behavior. Tying g-Select high selects the higher-sensitivity ±3g range, which is usually the safer default; floating g-Select can cause undefined state at power-up. When using the self-test feature, allow at least 100 ms for the delta to settle before reading the output; sampling too early produces an apparent failure on otherwise-healthy parts.
合規資訊
RoHS compliant and Lead Free per NXP product page and Mouser listing. Industrial temperature grade only (no AEC-Q100 automotive variant); the MMA7340LR1 is targeted at consumer and industrial handheld devices.
