MMA1270D - ±2.5g Z-Axis Accelerometer | NXP SOIC-16
MPN: MMA1270D ⚠ Lần mua cuốiMMA1270D Tóm tắt
What is a MEMS accelerometer? A MEMS (Micro-Electro-Mechanical Systems) accelerometer is a sensor that detects acceleration by measuring the displacement of a proof mass suspended on silicon springs; the MMA1270D specifically uses a silicon capacitive sensing cell whose capacitance changes under acceleration, then converts that change to a voltage through on-chip signal conditioning. As a single-axis analog sensor, it sits in the broader sensor hierarchy of inertial measurement units (IMU) and falls under the motion-sensor category.
Key features include factory-trimmed zero-g offset, full-scale span, and filter cut-off that require no external passive components, an integrated self-test function that simulates a defined acceleration to verify system functionality, and ratiometric analog output that scales with the 5 V supply. The MMA1270D targets industrial-grade operating environments with a stable transfer characteristic over temperature.
Typical applications include automotive motion sensing, industrial vibration monitoring, appliance anti-tilt detection, and general-purpose tilt/inclination measurement. With its 50 Hz bandwidth and 750 mV/g sensitivity, the device is well suited for low-frequency acceleration events and DC tilt sensing rather than high-frequency vibration analysis. The single-supply 5 V operation simplifies interface to standard microcontrollers with built-in ADC channels.
When designing with this part, ensure the analog-to-digital converter sampling rate is well above 200 Hz to satisfy the Nyquist criterion for the 50 Hz internal filter. Decouple the supply pin with a 0.1 µF ceramic capacitor placed within 5 mm of the device, and keep digital ground return currents away from the sensor's analog ground trace. The lead-free note is ambiguous in the historical record, so verify with the current RoHS certificate before placing into a RoHS-only build.
Bộ thay thế dễ dàng lắp đặt cho MMA1270D — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với MMA1270D (cùng hình factor và footprint) — khác nhau ở Acceleration Range, RoHS Status, Self-Test, Sensor Type, Output Type.
MMA1260D
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
MMA1220D
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →MMA1250D
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →MMA1270KEGR2
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
MMA1270D Tỷ lệ tối đa & tính chất điện
| Kiểu cảm biến | Accelerometer (MEMS, capacitive) |
| Axis | Z (single-axis) |
| Acceleration Range | ±2.5 g |
| Sensitivity | 750 mV/g typical (712.5–787.5 mV/g) |
| Điện áp cung cấp | 4.75 V to 5.25 V |
| Kiểu đầu ra | Analog, ratiometric |
| Zero-g Output (typ.) | 2.5 V (Vdd/2) |
| Bandwidth | 50 Hz (2-pole low-pass filter) |
| Self-Test | Yes (ST pin, active-high) |
| Hộp | SOIC-16 (Dw), surface mount |
| Nhiệt độ hoạt động | -40 °C to +85 °C (industrial) |
| Kiểu lắp đặt | Surface Mount |
| Lead-Free Status | Contains Lead (historical datasheet note) |
| Trạng thái RoHS | RoHS Non-Compliant (historical datasheet note) |
Cấu hình chân MMA1270D
| Chân 1 | VDD — Power supply (5 V) |
| Chân 2 | NC — Not connected |
| Chân 3 | GND — Ground |
| Chân 4 | NC — Not connected |
| Chân 5 | OUT — Analog accelerometer output |
| Chân 6 | NC — Not connected |
| Chân 7 | ST — Self-test input (active high) |
| Chân 8 | NC — Not connected |
| Chân 9 | NC — Not connected |
| Chân 10 | NC — Not connected |
| Chân 11 | NC — Not connected |
| Chân 12 | NC — Not connected |
| Chân 13 | NC — Not connected |
| Chân 14 | NC — Not connected |
| Chân 15 | NC — Not connected |
| Chân 16 | NC — Not connected |
Ứng dụng tiêu biểu
MMA1270D phù hợp cho 6 Áp dụngs: Automotive Electronic Stability Control Input, Industrial Vibration Monitoring, Appliance Anti-Tilt Detection, Tilt and Inclination Sensing, Portable Data Recorder / Black Box, Security / Alarm Shock Sensor.
Automotive Electronic Stability Control Input
The MMA1270D's ±2.5 g Z-axis range and 750 mV/g sensitivity suit it as a chassis-tilt or pitch-rate backup sensor in vehicle dynamics modules, where the analog output feeds an automotive MCU's ADC with ratiometric noise immunity tied to the 5 V supply. Its 50 Hz low-pass filter attenuates suspension-pump road noise above the dynamics bandwidth of vehicle body roll, and the on-chip self-test pin enables end-of-line functional verification at the ECU assembly plant. Use the MMA1270KEGR2 automotive variant when AEC-Q100 qualification is required.
Được đề xuất
Industrial Vibration Monitoring
With its 50 Hz internal low-pass filter and 750 mV/g sensitivity, the MMA1270D works as a low-frequency vibration node on rotating machinery such as fans, blowers, and pumps, where the analog output can be sampled by a 12-bit ADC at 1 kHz to capture vibration envelopes below the filter cutoff. The factory-trimmed zero-g bias of 2.5 V (Vdd/2) means tilt drift on a wall-mounted enclosure shows up as a clean DC offset rather than calibration error, simplifying the BMS firmware. Its industrial -40 °C to +85 °C window supports outdoor NEMA enclosures.
Được đề xuất
Appliance Anti-Tilt Detection
The MMA1270D's 750 mV/g sensitivity delivers roughly 1.9 V of swing at full ±2.5 g tilt, well within the input range of a 5 V microcontroller ADC and ideal for appliance anti-tip interlocks in washing machines and refrigerators. Compared to a digital-output sensor, the analog chain inside the MMA1270D lets designers decide the threshold in firmware and add hysteresis, while the 50 Hz filter rejects motor hum that would otherwise false-trigger the interlock. The integrated self-test pin supports automated end-of-line functional checks.
Được đề xuất
Tilt and Inclination Sensing
Operating at zero-g bias of 2.5 V and sensitivity 750 mV/g, the MMA1270D delivers about ±1.875 V of output swing across the ±2.5 g full-scale tilt range, making it a straightforward tilt sensor when the device is mounted horizontally on a level reference plane. The 2.5 V midpoint lets the host microcontroller use Vdd/2 as the reference for symmetric tilt thresholds and ratiometric ADC conversion to cancel supply drift. The 50 Hz 2-pole low-pass filter smooths out high-frequency vibration so a slowly-tilted enclosure reports clean DC angle.
Được đề xuất
Portable Data Recorder / Black Box
The MMA1270D's 5 V single-supply operation and low power fit a black-box-style data recorder capturing crash or drop events, where its analog output can be sampled by an MCU's buffered ADC and stored in non-volatile memory. With ±2.5 g range and 750 mV/g sensitivity, the recorder can resolve roughly 1.5 g peak impact with margin, while the integrated self-test pin lets the host run a stored-pattern self-test on power-up to confirm the sensor chain is alive before logging. Industrial -40 °C to +85 °C temperature range supports outdoor data-logger enclosures.
Được đề xuất
Security / Alarm Shock Sensor
Placed on a wall or cabinet, the MMA1270D detects knocks and tilts well above the 50 Hz filter cutoff at low-g magnitudes, making it suitable for glass-break and alarm shock detectors where the analog output swings in response to a percussive impact. Ratiometric output keeps supply ripple from triggering false alarms, and the SOIC-16 footprint fits behind a ceiling-mounted housing next to the alarm panel. The factory-trimmed zero-g bias and self-test pin help calibrate the threshold and run end-of-line verification in alarm-panel manufacturing.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho MMA1270D — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | MMA1260D | MMA1220D | MMA1250D | MMA1270KEGR2 |
|---|---|---|---|---|---|
| Brand | NXP Semiconductors | NXP Semiconductors (Freescale) | NXP Semiconductors (Freescale) | NXP Semiconductors (Freescale) | NXP Semiconductors |
| Package | SOIC-16 (Dw) | SOIC-16 (Dw) - same | SOIC-16 (Dw) - same | SOIC-16 (Dw) - same | SOIC-16 (Dw) - same |
| Axis | Z (single) | Z (single) | Z (single) | Z (single) | Z (single) |
| Acceleration Range | ±2.5 g | ±1.5 g (-40%) | ±5 g (+100%) | ±5 g ±2 g | ±2.5 g (same) |
| Supply Voltage | 4.75–5.25 V | 4.75–5.25 V (same) | 4.75–5.25 V (same) | 4.75–5.25 V (same) | 4.75–5.25 V (same) |
| AEC-Q100 Grade | Not qualified (industrial) | Not qualified | Not qualified | Not qualified | AEC-Q100 qualified |
| Operating Temperature | -40 °C to +85 °C | -40 °C to +85 °C (same) | -40 °C to +85 °C (same) | -40 °C to +85 °C | -40 °C to +125 °C |
Bảo phân biệt quan trọng
- Higher ±2.5 g range than the MMA1260D (vsMMA1260D)
- Lower ±2.5 g range for higher sensitivity than the MMA1220D (vsMMA1220D)
- Automotive-grade drop option via KEGR2 suffix (vsMMA1270KEGR2)
Ghi chú thiết kế
Estimated: at 5.0 V supply and 1 mA quiescent current typical, the MMA1270D dissipates roughly 5 mW. Power-supply noise directly couples onto the analog output through the ratiometric architecture, so place a 0.1 µF ceramic decoupling capacitor within 5 mm of the VDD pin and a small ferrite bead in series with VDD if the host supply is shared with a switching regulator. Add a bulk 1 µF ceramic or tantalum on the analog rail to suppress motor inrush from a shared vehicle or appliance bus.
Keep digital ground return paths away from the MMA1270D analog ground trace; place the sensor ground on a low-noise cut in the ground plane nearest the IC body. Route the analog OUT line as a short, guarded trace away from switching converter traces, and add a small RC (10 kΩ + 100 nF) anti-aliasing filter at the ADC input to suppress energy beyond 50 Hz above the internal pole. If the device sits on a chassis that may bend, isolate the SOIC-16 with compliant mounts so PCB flex does not bias the MEMS proof mass.
Avoid using the legacy MMA1270D in a RoHS-only end product: the historical datasheet lists 'Contains Lead' and 'RoHS Non-Compliant'. Check the actual reel and request a RoHS/lead-free certificate before placement. Treat the 50 Hz internal filter as part of the signal chain - sampling the ADC below 200 Hz violates Nyquist and folds out-of-band noise into the reading. Finally, do not assume any cross-axis calibration; the MMA1270D is a Z-axis-only sensor, so X/Y acceleration appears as a small residual rather than a measured value.
Thông tin tuân thủ
Per historical datasheet, RoHS Non-Compliant and 'Contains Lead' for the legacy MMA1270D (industrial grade, -40 °C to +85 °C). For AEC-Q100 automotive applications, select the MMA1270KEGR2 variant. REACH / halogen / conflict-mineral status not explicitly stated in the verified web data and marked unknown pending a current material declaration.
