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STMicro three-axis linear accelerometer eye portable apps

Posted: 20 Feb 2003 ?? ?Print Version ?Bookmark and Share

Keywords:stmicroelectronics? lis3l02? lis3l02a? lis3l02p? lis3l02d?

STMicroelectronics has announced the availability of a three-axis linear accelerometer that combines a MEMS-based sensor and interface chip in a single QFN package, making it suitable for use in mobile phones, PDAs, and other handheld terminals.

The accelerometers are suitable for applications where sensing of movement or inclination is needed. It can also be used as a general-purpose vibration sensor for industrial equipment and domestic appliances to detect fault conditions.

The LIS3L02 features an on-chip, three-axis MEMS accelerometer sensor, plus an interface chip that translates movement and inclination into calibrated analog voltage or digital outputs. Further, the device is claimed by the company to exhibit high sensitivity and precision.

Movement or inclination in three axes causes small displacements of moving silicon structures in the MEMS sensor die, changing the capacitance between moving and fixed parts. The interface chip then translates these minute capacitance changes into calibrated analog voltages proportional to the movement.

Three versions of the LIS3L02 are currently available: type LIS3L02A provides an analog output; LIS3L02P provides both an analog voltage output and PWM output; and type LIS3L02D provides a serial digital I?C output.

All of them operate from a 3.3V to 5V supply and have an equivalent noise acceleration >500 millionths of 1g. During transport and service it can withstand accelerations up to 1,500g without damage, making it sufficiently shock resistant for mobile phone applications.

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