Wearables

Wearable Sensor Technology

InvenSense offers a wide range of 6-axis, and 9-axis motion sensors as well as analog, PDM,and I²S Microphones for the wearable market .  But the offering does not stop at the device level. For this application, InvenSense offers a more complete sensor platform system solution that delivers a use case, solves a system power problem, or improvement of other companion sensor performance.  To summarize the sensor platform system solution InvenSense offers:   

  1. Wrist Worn Wearable Offering: ICM-20648, ICM-30631/32
  2. GPS in Smart Watch or Activity Tracker: Coursa Sports
  3. High FSR device for Sports Motion Analysis: ICM-20649

Complete Wearable SoC Solution

Wearable products today are expected to deliver valuable services to their owners to help drive a better lifestyle.   Specifically, the wrist worn wearable market requires OEMs to deliver wellness and fitness related services, a key reason the market traction for these devices is increasing quickly. Key sensors such as Accelerometer, gyroscope, magnetometer, PPG, and pressure sensors are required for smart watches and activity trackers to deliver on those promises. To enable these services the OEMs need a deep technical understanding of these sensors which requires a big R&D effort.  InvenSense has removed this hurdle by delivering a complete Wearable SoC (ICM-30631/32) that delivers the following software features. 

ICM-20648 (6-axis) offers step counter and activity recognition (walk, run, bike, still) all part of the integrated DMP.  For those applications that want just raw sensor data please reference ICM-20602.

  • Activity Classifier (walk, run, bike, still)
  • Step Counter
  • Calorie counter
  • Sleep quality analysis
  • Distance and floors climbed (ICM-30631 only)
  • Analytics: Walk/Run and Stand/Sit Time Accrual and Sedentary Reminder
  • Wrist Gestures: Double-tap and Shake and B2S
  • PPG sensor related measurements (motion artifact correction and R-R interval for Heart Rate Variation) – supported only by ICM-30631

Coursa Sports for Wearables

When GPS is offered in a Smart watch or activity tracker, the key use case is to track the user’s running session by tracking their speed, distance, and route. The problem with GPS is that it burns a lot of the already small wearable battery.  InvenSense has solved this problem via the Coursa Sports platform which duty cycles the GPS and then uses PDR technology to track the users speed and distance in real-time and their route (post-processed) when the GPS is off.

wide-fsr

Coursa Sports improves the wearable device battery life by up to 50% during workouts by frequently turning GNSS off (duty-cycling). During duty-cycling, the lower power sensors are used to track fitness data at the same accuracy as GNSS. This feature extends battery life during a running session, and enables developers to migrate their smartphone apps to smart watch devices, where smaller batteries and the high power consumption of GNSS previously prohibited fitness tracking use cases.

The Coursa Sports platform is designed to provide more accurate and always available speed, distance, and route tracking and at least a 3X improvement in relative elevation reporting for walking, hiking and running at up to 50% reduced power consumption as to 100%-On GPS. Coursa Sports is comprised of an SDK for integration into a mobile/wearable application and a cloud server. Mobile and wearable application developers can download the Coursa Sports SDK (Android or IOS) today from coursasports.com.

Wide FSR Devices for Sports Motion Analysis

Many of today’s wearable and sports solutions, which analyze the motion of a user’s golf or tennis swings, soccer ball kicks, or basketball activities, require higher than currently available ±2000 dps (degrees per second) FSR for gyroscope and ±16g FSR for accelerometer to better insure that critical data is not lost at the point of high impact or high speed rotation. The ICM-20649 is world’s widest full scale range (FSR) 6-axis integrated MEMS (3-axis gyroscope + 3-axis accelerometer) and offers the smallest size, lowest profile and lowest power in conjunction with its industry leading high FSR. With an extended FSR range of ±4000 dps for gyroscope and ±30g for accelerometer, the ICM-20649 enables precise analysis of contact sports applications providing continuous motion sensor data before, during and after impact providing more accurate feedback to the end-user and enabling new markets and applications. 

6-axis Solutions for HMD/VR

Aligning the video with the head movement is key component in making the HMD/VR user experience enjoyable. IMU motion tracking is one of the key components to help solve this absolute positioning problem.  InvenSense offers the ICM-20602, best 6-axis sensor that delivers on key performance metrics such as gyro sensitivity drift over time and temp and bias instability as well accel drift vs. temperature. 

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