STMicroelectronics Announces Compact Motion Sensor to Improve Comfort and Measurement Accuracy of Medical Wearables and Implantable Devices

STMicroelectronics (NYSE: STM, hereinafter ST) has announced the "MIS2DU12" MEMS accelerometer, which combines ultra-low power consumption, signal processing capabilities, and ultra-compact size, making it ideal for medical wearables and implantable devices.

Produced with biocompatible materials and manufacturing processes, the MIS2DU12 features a current consumption of only 20nA in power-down mode and less than 1µA in active mode, enabling a long operating life in implantable devices such as heart monitors and pacemakers. Its slim profile of just 0.74mm and compact footprint of 2 x 2mm also allow for ultra-thin, lightweight, and more comfortable patch sensors.

In patch sensors such as blood glucose monitors and other biometric parameter sensors, the MIS2DU12's sensor fusion maintains high accuracy even under macroscopic movements and ambient environmental stress. This provides these applications with the benefits of high sensitivity to subtle movements and high power efficiency. It incorporates a dedicated motion processing engine capable of free-fall, wake-up, single/double tap, and active/inactive detection, as well as 6-axis/4-axis orientation detection. It also features a self-test function and a temperature sensor.

The MIS2DU12 integrates motion processing circuits for event detection and wake-up, and is equipped with an anti-aliasing filter to maximize output data quality. By eliminating vibration sources outside the band with this filter, it reduces the load on the host application processor and lowers overall system power consumption. The sensor's current consumption is only 0.47μA in ultra-low power active mode with a 1.6Hz output data rate, and can be suppressed to 5.6µA even when operating in normal mode with the anti-aliasing filter enabled.

The MIS2DU12 features a selectable full-scale range of ±2g / ±4g / ±8g / ±16g, an output data rate of 1.6Hz to 800Hz, and a wide operating temperature range of -40°C to +85°C. It integrates a 128-level FIFO buffer, providing large-capacity data storage and excellent flexibility, contributing to reduced system power consumption.

An "STEVAL-MKI255A" adapter board is also available for quick evaluation. This evaluation board, equipped with the MIS2DU12 sensor, features a standard DIL24 pin layout, allowing it to be used in conjunction with the "STEVAL-MKI109D" evaluation board. This evaluation board is equipped with a high-performance 32-bit microcontroller and utilizes ST's "MEMS Studio" GUI.