STMicroelectronics LIS2DTW12TR

Overview

LIS2DTW12TR from STMicroelectronics is an ultralow-power 3-axis MEMS accelerometer with integrated temperature sensor, designed for motion-aware battery-powered systems. It delivers ±2g/±4g/±8g/±16g full-scale ranges, 16-bit acceleration data, 12-bit temperature data, and operates from 1.62 V to 3.6 V with as low as 50 nA power-down current. Used in tap/double-tap recognition, free-fall detection, and display orientation in portable healthcare and wireless sensor nodes.

For engineers reviewing the LIS2DTW12TR datasheet, LIS2DTW12TR pinout, LIS2DTW12TR application, or LIS2DTW12TR equivalent, key selection criteria include RMS noise (1.3 mg in LP mode), embedded motion engine (6D orientation, stationary/motion detection), FIFO depth (32-level), self-test capability, and dual I²C/SPI interface support with independent IO supply.

Technical Context

The LIS2DTW12TR implements a configurable dual-mode architecture: high-performance mode (90 µg/√Hz noise, 90 µA @ 100 Hz) and four selectable low-power modes (down to 0.38 µA @ 1.6 Hz). Its embedded motion processing engine supports Android-compliant stationary/motion detection, activity/inactivity, portrait/landscape, and highly configurable single/double-tap recognition without host CPU intervention.

It integrates a factory-calibrated temperature sensor (±0.8 °C typ. accuracy over 0–70 °C) with programmable ODRs (1.6–50 Hz) and resolution (8–12 bit), plus a 32-level FIFO to reduce host polling frequency. The device uses a dedicated internal state machine for interrupt generation (INT1/INT2), enabling autonomous wake-up and data-ready signaling.

Key Specifications

Pinout & Package

Package: LGA-12L (2.0 mm × 2.0 mm × 0.7 mm, 0.4 mm pitch), RoHS and ECOPACK compliant, qualified for -40 °C to +85 °C operation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 3-axis MEMS accelerometer applications.

Compared with LSM6DSOXTR and IIS2DLPC, the LIS2DTW12TR uniquely balances sub-µA power, integrated temperature sensing, and autonomous Android-compliant motion processing in a 2.0×2.0 mm footprint - making it optimal for compact, battery-constrained devices requiring intelligent motion awareness without gyro or host compute overhead.

Availability

LIS2DTW12TR is available at Aetrix Electronics and suitable for fragile shipment tracking, portable healthcare monitoring, wireless sensor nodes, and smartphone display orientation requiring stable component supply across long-lifecycle industrial and consumer programs.

Supply support for LIS2DTW12TR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, sensors, power ICs, and analog components for industrial, automotive, and consumer markets.

The LIS2DTW12TR belongs to ST's "femto" family of ultra-low-power MEMS sensors, engineered specifically for energy-constrained edge devices requiring intelligent motion awareness, thermal context, and long-term reliability without compromising on feature richness.

FAQ

What is the maximum I²C clock frequency supported by the LIS2DTW12TR?

The LIS2DTW12TR supports I²C standard mode (up to 100 kHz) and fast mode (up to 400 kHz) as specified in Table 7 of DS12825 Rev 4. High-speed mode (up to 3.4 MHz) is characterized but not production-tested; for robust designs, use ≤400 kHz with proper bus capacitance control (≤550 pF).

How does the single data conversion on-demand mode reduce system power consumption?

In on-demand mode, the LIS2DTW12TR remains in power-down (50 nA) until triggered by either an INT2 clock pulse or register write. After a fixed turn-on time (1.2–3.55 ms depending on LP mode), it acquires one sample and returns to power-down. This eliminates continuous sampling overhead - ideal for infrequent event detection like tap or fall triggers.

Can the LIS2DTW12TR operate with different voltages on VDD and VDDIO?

Yes. VDD (1.62–3.6 V) powers the MEMS and analog chain, while VDDIO (1.62–VDD+0.1 V) supplies the digital I/O. They may be independently controlled: VDD can be removed while maintaining VDDIO to preserve I²C/SPI communication and register access, though acceleration measurement is disabled.

Is the built-in temperature sensor calibrated across the full operating range?

The temperature sensor is factory-calibrated at 25 °C and specified for ±0.8 °C typical accuracy over 0–70 °C and ±1.3 °C over the full -40 to +85 °C range. Its output resolution is programmable (8–12 bit), and refresh rate scales with accelerometer ODR - up to 50 Hz in high-performance mode.