Tri-axis accelerometers can be used in wearables
MEMS manufacturer Kionix, part of the Rohm group, claims that its KX112 and KXCJB are the industry’s first thin, functional tri-axis accelerometers.
The KX112 (2 x 2 x 0.6mm) and KXCJB (3 x 3 x 0.45mm) are suitable for mobile, PC, tablet and wearable applications, as well as automotive and heavy-duty industrial applications.
The KX112 is suitable for the compact designs required in the health, medical and wearable markets. It has 16bit resolution and stability, and features built-in digital algorithms for detecting motion for power management, free fall for device protection or warranty monitoring, an orientation engine for portrait or landscape detection, and tap/double-tap for user interface. There is also the company’s FlexSet technology, allowing fine granularity for balancing power and performance. It is also claimed to have the largest FIFO/FILO buffer available on a mass-produced accelerometer. With 2048bytes available, the rest of the system can sleep while it is recording more data than any other accelerometer on the market, enabling superior power-savings and event context.
Other features include a 2 x 2 x 0.6mm LGA and a user-selectable g range and output data rate. It also offers a user-configurable wake-up function and digital I2C up to 3.4MHz
The KXCJB is claimed to be the thinnest accelerometer available in any footprint, measuring just 3 x 3 x 0.45mm thick – half the thickness of most accelerometers on the market. It can be used to embed motion detection and motion sensing capabilities into badges, access cards, and payment/smart cards, while also opening up possibilities of maintaining low profiles when mounting on or in glass, plastic and other thin structures.
Power consumption is less than 1µA in standby, 10µA at low resolution, and 135µA at high resolution. It also has I2C digital communication interface and user selectable g ranges.
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