These latest accelerometers from Kionix have a sense element fabricated using proprietary plasma micromachining process technology. Acceleration sensing is based on the principle of a differential capacitance arising from acceleration-induced motion of the sense element. Kionix uses common-mode cancellation to decrease errors from process variation, temperature and environmental stress.
The KX22x devices can measure higher rates of acceleration than the accelerometers commonly used in smartphones and tablets for orientation detection and other functions. The Kionix parts are intended to serve industrial and sports applications which require this extended measurement range, and also the higher bandwidth and sampling rates up to 25.6kHz available from the KX222 and KX224.
While many accelerometers have mechanical resonances of 1-2kHz, the Kionix sensors offer higher bandwidths with mechanical resonances up to 6kHz. In addition, the mechanical MEMS structures in the KX222 and KX224 are built for shock resistance and resilience, withstanding shocks of up to 10,000g.
The KX222 and KX224 are housed in an LGA plastic package with a 0.9mm profile. The KX222’s footprint is 2mm x 2mm, and the KX224’s is 3mm x 3mm.
- Integrated orientation, tap/double tap, activity-detection and free-fall algorithms
- Range of user-configurable output data rates: 0.781Hz to 25.6kHz
- 16-bit resolution
- Supply-voltage range: 1.71V to 3.6V
- User-selectable low-power and high-resolution modes
- I2C and serial peripheral interfaces
- Factory-programmed offset and sensitivity
- Self-test function
- Industrial equipment
- Sports devices