Part # Application Notes Mobile Communications Personal Electronics Toys datasheet

Part Manufacturer: ST Microelectronics

ST Microelectronics

Part Description: LIS302DL 3-axis digital MEMS accelerometer translates finger taps into actions


Part Details:

AN2579 Application note LIS302DL 3-axis digital MEMS accelerometer translates finger taps into actions Introduction This document is intended to provide application information for the LIS302DL low-voltage 3-axis digital output linear MEMS accelerometer housed in an LGA package. The LIS302DL is an ultra-compact low-power 3-axis linear accelerometer that includes a sensing element and an IC interface capable taking information from the sensing element and providing the measured acceleration data to external applications via an I2C/SPI serial interface. The sensing element used to detect acceleration is manufactured using a dedicated process developed by ST to produce inertial sensors and actuators in silicon. The IC interface is instead manufactured using a CMOS process that allows a high level of integration to design a dedicated circuit which is factory trimmed to better match the sensing element characteristics. The LIS302DL has a user-selectable full scale of ±2g and ±8g and is capable of measuring accelerations with an output data rate of 100 Hz or 400 Hz. A self-test capability allows the user to check that the system is operating correctly. The device features two independent, highly programmable interrupt sources that can be configured either to generate an inertial wake-up interrupt signal when a programmable acceleration threshold is exceeded along one of the three axes, to detect a free-fall or to recognize single/double click events. Two independent pins can be configured to provide interrupt signals to connected devices. The LIS302DL is available in a plastic SMD package and is designed to operate over a temperature range extending from -40 °C to +85 °C. The ultra small size and weight of the SMD package make it an ideal choice for handheld portable applications such as cell phones and PDAs, or any other application where reduced package size and weight are required. January 2008 Rev 1 1/15 www.st.com Contents AN2579 Contents 1 Theory of operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 1.1 Single click . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 1.2 Double click . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2 Register description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 2.1 CLICK_CFG (38h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 2.2 CLICK_SRC (39h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 2.3 CLICK_THSY_X (3Bh) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2.4 CLICK_THSZ (3Ch) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2.5 CLICK_TimeLimit (3Dh) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.6 CLICK_Latency (3Eh) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.7 CLICK_Window (3Fh) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.8 CTRL_REG3 [Interrupt CTRL register] (22h) . . . . . . . . . . . . . . . . . . . . . . . 8 3 Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 3.1 Playing with CLICK_TimeLimit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 3.2 Playing with CLICK_Latency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 3.3 Playing with CLICK_Window . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 4


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