Low-Power Turnkey Pedometer Devices Pack Embedded Functionality

ROHM Group company Kionix, Inc. adds embedded functionality to its line of high-performance accelerometers. The new KX126 tri-axis accelerometer integrates a step detector and step counter. The trend towards embedding functionality directly in a sensor has benefits that go beyond simply providing an easy to use, turnkey pedometer solution.

The KX126 is a high resolution (16-bit) tri-axis digital accelerometer that comes in an ultra-compact 2mm x 2mm x 0.9mm LGA package.  It supports normal/fast/high-speed I2C communications up to 3.4MHz and SPI communication up to 10MHz, range settings of +/- 2g, 4g, and 8g, accurate timing over temperature, and configurable low-noise and low-power modes.

In addition to pedometer functionality, a 2,048- byte FIFO buffer is built in that can capture seconds or minutes of motion data while the rest of the system sleeps.  Other key features include high sampling rates (up to 25.6kHz) that allow detection and capture of fast, high frequency motions and a high-resolution wake-up/motion detection algorithm capable of detecting as little as 3.9mg of motion.  Also, highly customizable embedded digital engines allow for automated detection of tilt, freefall, screen orientation changes, and tap/double-tap events.

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