MEMS Sensor Detects Pitch And Roll Of Devices

Based on silicon-machined micro-electromechanical system (MEMS) technology, the LIS2L01 two-axis linear accelerometer can sense the inclination of a device in both side-to-side (roll) and forward-and-back (pitch) directions. A major application for the accelerometer is seen in handheld game-pad human interface devices for video games. Here, the new sensor enables control of game parameters, such as steering and braking, without being physically connected to a fixed structure. With the accelerometer, designers reportedly can build game-pads that are cheaper and simpler than those based on existing steering wheel or joystick assemblies. The LIS2L01 integrates in a small-outline package a low-pass filter, MEMS accelerometer sensor, and an interface chip. When a device containing the sensor moves in two directions, a silicon element in the MEMS die moves slightly, causing a minute change in capacitance, with the interface chip translating the change into calibrated voltages proportional to the movement. The board-mountable LIS2L01 two-axis accelerometer has a sensitivity of 2V/g over a bandwidth of dc to 30 Hz and costs in the range of $3-$4 each/1M. For more details, contact STMICROELECTRONICS, Lexington, MA. (781) 861-2650.