STEVAL-MKI024V1 STMicroelectronics

LIS331DL MEMS motion sensor 3-axis - 2g/8g smart digital output nano accelerometer Features 2.16 V to 3.6 V supply voltage 1.8 V compatible IOs <1 mW power consumption 2g / 8g dynamically selectable full-scale 2 I C/SPI digital output interface Programmable interrupt generator LGA 16 (3x3x1 mm) Embedded click and double click recognition Embedded free-fall and motion detection Embedded high pass filter process developed by ST to produce inertial sensors and actuators in silicon. Embedded self test The IC interface is manufactured using a CMOS 10000 g high shock survivability process that allows to design a dedicated circuit ECOPACK RoHS and Green compliant which is trimmed to better match the sensing (see Section 9) element characteristics. The LIS331DL has dynamically user selectable Applications full scales of 2g/8g and it is capable of Free-Fall detection measuring accelerations with an output data rate of 100 Hz or 400 Hz. Motion activated functions A self-test capability allows the user to check the Gaming and virtual reality input devices functioning of the sensor in the final application. Vibration monitoring and compensation The device may be configured to generate inertial wake-up/free-fall interrupt signals when a Description programmable acceleration threshold is crossed at least in one of the three axes. Thresholds and The LIS331DL, belonging to the nano family of timing of interrupt generators are programmable ST motion sensors, is the smallest consumer low- by the end user on the fly. power three axes linear accelerometer. The 2 device features digital I C/SPI serial interface The LIS331DL is available in plastic Land Grid standard output and smart embedded functions. Array package (LGA) and it is guaranteed to operate over an extended temperature range from The sensing element, capable of detecting the -40 C to +85 C. acceleration, is manufactured using a dedicated Table 1. Device summary Order code Temp range C Package Packing LIS331DL -40 to +85 LGA Tray LIS331DLTR -40 to +85 LGA Tape and reel April 2008 Rev 3 1/42 www.st.com 42Contents LIS331DL Contents 1 Block diagram and pin description . 6 1.1 Block diagram . 6 1.2 Pin description 6 2 Mechanical and electrical specifications 8 2.1 Mechanical characteristics . 8 2.2 Electrical characteristics . 9 2.3 Communication interface characteristics . 10 2.3.1 SPI - serial peripheral interface . 10 2.3.2 I2C - Inter IC control interface 11 2.4 Absolute maximum ratings 12 2.5 Terminology . 13 2.5.1 Sensitivity 13 2.5.2 Zero-g level 13 2.5.3 Self test . 13 2.5.4 Click and double click recognition . 13 3 Functionality 14 3.1 Sensing element 14 3.2 IC interface 14 3.3 Factory calibration 14 4 Application hints . 15 4.1 Soldering information 15 5 Digital interfaces . 16 5.1 I2C serial interface 16 5.1.1 I2C operation . 17 5.2 SPI bus interface . 18 5.2.1 SPI read . 19 5.2.2 SPI write 20 5.2.3 SPI read in 3-wires mode . 21 2/42