This application note provides 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 document provides application information for the LIS302DL low-voltage 3-axis linear accelerometer, which is housed in an LGA package. It details how to translate finger taps into actions using single and double click recognition functions.
The note explains the theory of operation for detecting single clicks (interrupts generated when acceleration exceeds a threshold) and double clicks (two rapid stimuli within specific time windows). It includes register descriptions for configuring thresholds, timing limits, latency, and window settings to customize these detection events.
| Product Type | 3-axis digital MEMS accelerometer |
|---|---|
| Package Type | plastic SMD package / LGA package |
| Operating Temperature Range | -40 °C to +85 °C |
| Output Data Rate | 100 Hz or 400 Hz |
| Full Scale Selection | +2g and +8g |
The threshold value is expressed over 4 bits as an unsigned number, ranging from 0.5g to 7.5g with increments of 0.5g.
The TimeLimit register defines the maximum time interval between the start of detection and when acceleration goes back below the threshold, ranging from 0 to 127.5 msec.
The Latency register defines the time interval after the first click where detection is disabled, ranging from 0 to 255 msec.