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. Complete Wrist Worn Wearable Offering: ICM-30631 (available in Q2 2016)
  2. GPS in Smart Watch or Activity Tracker: Coursa Sports
  3. High FSR devise for Sports Motion Analysis

Complete Wearable SoC Solution

Wearable Technology today is expected to deliver valuable services to their users 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 exponentially. Accelerometer, gyroscope, magnetometer, PPG, and pressure sensor processing is essential for smart watches and activity trackers.  To enable these services the OEMs need a deep technical understanding to yield the valuable contextual and analytical data from the complex sensor outputs. InvenSense is a leader in inertial sensors whose data delivers many of the key components required to calculate steps walk/run, activity/context recognition and Heart rate while the user is running or exercising.  Not only does InvenSense offer complete solutions around its own inertial sensors, but they also assist in delivering the valuable information of other common health/fitness sensors. 

  • Context Awareness
    • Real Time Activity Recognition: Walk, run, bike, still, car, Sleep Quality Analysis
    • Counters: Walk/Run Step Counter, Stand/Sit Time Counter
    • Distance/Speed calculation
  • PPG Sensor Complete Solution
    • PPG Motion Artifact correction – Delivers accurate bpm from the PPG sensor while the user is running/exercising
    • Heart Rate Variation
  • Pressure (Barometer) Complete Solution
    • Floors Climbed for accurate Calorie counting
  • Gestures
    • Bring-to-See
    • Look-to-See
    • Shake
    • Double Tap



With InvenSene’s Firefly™ offering – all of the above SW features can be delivered via an SoC that includes InvenSense’s 6-axis integrated MEMS (3-axis accelerometer + 3-axis gyroscope) motion sensors, Embedded Cortex class processor, and InvenSense’s Digital Motion Processor (DMP) blocks for efficient lower power sensor processing in a small 3mm x 3mm 24-QFN package. The InvenSense complete wearable platform  (ICM-30631 is coming soon in Q2 2016) is intended to provide all the essential wrist worn wearable features related to context, vital sign monitoring and inertial sensor related analytics. The wearable platform assists an OEM’s time to market, utilize less of their constrained resources and allows them to focus on supplementary differentiating features on-top of those offered by the ICM-30631.

For applications not requiring the total SW stack for a wrist worn application, ICM-20648 (6-axis) offers step counter and activity recognition (walk, run, bike, still, car) all part of the integrated DMP.  For those applications that want just raw sensor data please reference ICM-20602.

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.


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-20601 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 ±32g for accelerometer, the ICM-20601 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 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.