LIS3DHTR – STMicroelectronics Ultra-Low-Power 3-Axis Digital Accelerometer

Product Overview

The LIS3DHTR is an ultra-low-power, high-performance 3-axis linear accelerometer manufactured by STMicroelectronics. It belongs to ST’s “nano” MEMS accelerometer family, designed for motion detection, tilt sensing, orientation recognition, free-fall detection, vibration monitoring, and low-power embedded motion applications.

This device measures acceleration along the X, Y, and Z axes, supports dynamically selectable full-scale ranges of ±2g, ±4g, ±8g, and ±16g, and provides digital output through I²C or SPI serial interfaces. ST’s official LIS3DH page describes the device as an ultra-low-power high-performance three-axis linear accelerometer with digital I²C/SPI serial interface output. 

The exact LIS3DHTR orderable part is listed by DigiKey as an active digital accelerometer, with X/Y/Z axes, ±2g / ±4g / ±8g / ±16g selectable acceleration range, I²C/SPI output, 1.71V to 3.6V supply voltage, 16-LGA 3mm × 3mm package, and -40°C to +85°C operating temperature. 

Part Number Breakdown

Competitive Advantages

✔ 3-axis MEMS digital accelerometer

✔ Selectable full-scale ranges: ±2g / ±4g / ±8g / ±16g

✔ I²C and SPI digital output interfaces

✔ Wide supply range: 1.71V to 3.6V

✔ Ultra-low-power operation, down to 2µA class

✔ Embedded 32-level FIFO

✔ Built-in motion detection functions

✔ Integrated temperature sensor

✔ Compact 16-LGA 3mm × 3mm package

✔ Suitable for wearables, IoT sensors, motion detection, tilt sensing, free-fall detection, and industrial monitoring

Key Features

1. 3-Axis Linear Acceleration Measurement

The LIS3DHTR measures acceleration on three axes: X, Y, and Z.

Benefits:

• Detects movement, orientation, and tilt
• Supports 3D motion sensing in compact devices
• Useful for wake-up and activity detection
• Enables motion-based user interfaces and safety detection

2. Selectable ±2g / ±4g / ±8g / ±16g Ranges

The device supports dynamically selectable full-scale acceleration ranges of ±2g, ±4g, ±8g, and ±16g. 

Benefits:

• ±2g for high-sensitivity tilt and orientation sensing
• ±4g / ±8g for general motion tracking
• ±16g for shock, impact, and high-dynamic motion detection
• Allows software tuning for different applications

3. I²C and SPI Digital Interfaces

The LIS3DHTR provides a standard digital output through I²C and SPI serial interfaces. 

Benefits:

• Easy integration with MCUs and SoCs
• I²C supports simple two-wire sensor networks
• SPI supports faster and more robust sensor data transfer
• Reduces analog signal routing complexity

4. Ultra-Low-Power Operation

The LIS3DH family supports ultra-low-power operating modes, with datasheet summaries listing consumption down to 2µA. 

Benefits:

• Suitable for battery-powered devices
• Enables always-on motion detection
• Extends operating life in IoT and wearable products
• Reduces standby power consumption

5. Embedded FIFO Buffer

The device includes an embedded 32-level FIFO, allowing acceleration samples to be buffered before being read by the host processor.

Benefits:

• Reduces MCU polling frequency
• Lowers system power consumption
• Supports burst data collection
• Helps prevent data loss during high-rate sampling

6. Built-in Motion Detection Functions

The LIS3DH family supports smart embedded functions for motion detection, including event detection features commonly used for free-fall, wake-up, 6D/4D orientation, tap/double-tap, and activity/inactivity detection.

Benefits:

• Reduces firmware workload on the host MCU
• Enables interrupt-driven motion events
• Supports low-power wake-on-motion designs
• Useful for portable and wearable devices

7. Integrated Temperature Sensor

DigiKey lists the LIS3DHTR features as including a temperature sensor, along with adjustable bandwidth and selectable scale. 

Benefits:

• Provides auxiliary temperature information
• Useful for compensation or system monitoring
• Helps support sensor diagnostics
• Adds extra monitoring capability without another IC

8. Compact 16-LGA Package

The LIS3DHTR is supplied in a compact 16-LGA / 16-VFLGA 3mm × 3mm surface-mount package. 

Benefits:

• Very small PCB footprint
• Suitable for wearables and IoT sensors
• Compatible with automated SMT assembly
• Good fit for compact consumer and industrial designs

Applications

Wearables and Portable Devices

• Fitness trackers
• Smart watches
• Activity monitors
• Portable medical devices
• Handheld electronics

Motion Detection and Wake-Up Systems

• Wake-on-motion devices
• Tap and double-tap detection
• Screen orientation sensing
• Activity/inactivity detection
• Power-saving motion triggers

Industrial and IoT Sensors

• Asset movement detection
• Tilt monitoring
• Equipment vibration sensing
• Smart meters
• Wireless sensor nodes

Consumer Electronics

• Remote controls
• Game controllers
• Smart toys
• Portable speakers
• Smart home devices

Safety and Event Detection

• Free-fall detection
• Impact detection
• Shock logging
• Device drop detection
• Tamper detection