LIS2DWL TR (ST Microelectronics) three-axis MEMS accelerometer

I. Appearance and packaging form

Package: LGA-12 no-lead surface mount, 12 pads, no external leads, bottom pad contact soldering

Physical dimensions: 2.0 × 2.0 ×0.7mm, ultra-thin and miniature, suitable for wearable devices with limited space

Packaging: TR coil banding, palletized shipment;Operating temperature -40°C ~ +85°C (consumer / industrial grade, non-automotive grade)

The model code is printed on the top surface of the chip, and the bottom is all metal pads. The PCB layout needs to strictly match the LGA-12 pads.

2. Core electrical parameters

form

Project Specification

Measurement axis X/Y/Z three-axis acceleration

Programmable range ± 2g / ± 4g / ± 8g / ± 16g can be switched by software STMicroele...

Output 16-bit digital output;ODR：1.6Hz‑1600HzSTMicroele...

Communication interface I2C + SPI dual interface, IO can be independently powered

Power supply voltage 1.62V-3.6V, compatible with lithium battery 1.8V / 3.3V system STMicroele...

Power consumption (core advantage): 50nA in power-down mode;Low power operation: 0.38μ A typical;High performance mode: 90μA maximum

Noise Low power mode RMS noise 1.3mg, strong ability to identify subtle attitude changes

FIFO 32-level FIFO cache to reduce MCU wake-up frequency and reduce overall system power consumptionSTMicroele...

Impact resistance 10000 g impact resistance, shock resistance STMicroele...

Built-in resources Temperature sensor, self-check circuit; Two hardware interrupt pins, INT1 and INT2

Click / double-click detection: tapping recognition, earphone song switching, remote control button pressing

Wake-up-sleep detection: static sleep, motion wake-up

Free fall detection, fall protection

6D/4D attitude direction detection, screen horizontal and vertical flipping

Activity / Static detection, pedometer hardware engine, can directly output steps

On-chip self-test, the production line does not need to change the table to verify the good and bad of the sensor.

IV. Advantages

Industry-leading power consumption, microamperes or even nanoamperes, core selection advantage of battery-powered wearable devices, almost zero power consumption in sleep mode, extending device endurance

The body is very small, with a thickness of only 0.7mm, suitable for narrow structures such as TWS headphones and smart rings.

Hardware event detection, no need for MCU to read data at high frequency, overall system power consumption further reduced

The noise performance is excellent, and the inclination and step counting accuracy are high; Four ranges can be flexibly adapted to different scenarios.

Strong impact resistance, suitable for handheld wearable product drop situation

I2C/SPI compatibility, independent power supply for IO, compatible with various low-voltage controllers

V. Shortcomings and selection notes

Only accelerometer, no gyroscope; The angular velocity detection needs to be paired with the LSM6DS series six-axis device.

Consumer grade, not suitable for automotive electronics, no AEC‑ Q100 certification

LGA‑ 12 is a pinless package, which has high requirements for soldering on PCB pads and steel mesh. Poor soldering will directly lead to abnormal performance.

The output rate is limited in low power mode, and high-speed sampling requires switching to high-performance mode, which will increase power consumption.

There is an inherent error in the zero g offset, and software calibration compensation is needed for high-precision tilt scenarios.

VI. Typical Application Scenarios

TWS Bluetooth earbuds: wear detection, take off to sleep, double tap to control

Smart wristband / watch, smart ring: step counting, sleep monitoring, screen on when lifted, long sitting reminder

Pen, wireless remote control: posture recognition, tapping keys

Portable Internet of Things battery device: motion wake-up, vibration detection, posture reporting

Simple industrial vibration monitoring, equipment tilt alarm (non-severe high temperature conditions)

VII. Alternative selection reference

LIS2DH11TR: Older model, higher power consumption, pin compatible

LIS2DU11: Next-generation Femto with anti-aliasing filter and optimized power consumption

LSM6DSV Series: Six-axis (acceleration + gyroscope), choose when you need angular velocity