LIS2DHTR Motion Sensor: 3-Axis, Application Hint, Datasheet PDF

The LIS2DHTR  is an ultra-low-power high-performance three-axis linear accelerometer belonging to the “femto” family, with digital I2C  /SPI serial interface standard output.
The LIS2DHTR  has dynamically user selectable full scales of ±2g/±4g/±8g/±16g and it is capable of measuring accelerations with output data rates
from 1 Hz to 5.3 kHz.The self-test capability allows the user to check the functioning of the sensor in the final application.
The device may be configured to generate interrupt signals by two  independent inertial wake-up  /free-fall events as well as by the position
of the device itself.
The LIS2DHTR  is available in a small thin plastic land grid array package  (LGA) and is guaranteed to operate over an extended temperature range from -40  °C to +85  °C.

■ Wide supply voltage, 1.71 V to 3.6  V
■ Independent IOs  supply (1.8 V) and supply voltage compatible
■ Ultra-low-power mode consumption down to 2µA
■ ±2g/±4g/±8g/±16g dynamically selectable fullscale
■ I2C/SPI digital output interface
■ 2 independent programmable interrupt generators for free-fall and motion detection
■ 6D  /4D orientation detection 
■ “Sleep to wake” and “return to sleep” function
■ Freefall detection
■ Motion detection
■ Embedded temperature sensor
■ Embedded FIFO
■ ECOPACK® RoHS  and “Green” compliant

The following circuit shows the block diagram of LIS2DHTR

LIS2DHTR Block Diagram

The device core is supplied through the Vdd line while the I/O pads are supplied through the Vdd_IO  line. Power supply decoupling capacitors (100 nF ceramic, 10µF aluminium) should be placed as near as possible to pin 8 of the device (common design practice). All the voltage and ground supplies must be present at the same time to have the proper behaviour of the IC (refer to Figure below). It is possible to remove Vdd maintaining Vdd_IO  without blocking the communication bus, in this condition the measurement chain is powered off.
The functionality of the device and the measured acceleration data is selectable and accessible through the I2C or SPI  interfaces. When using the I2C, CS  must be tied high. The functions, the threshold and the timing of the two interrupt pins (INT1 and INT2  ) can be completely programmed by the user through the I2C/SPI interface.

LIS2DHTR Application Hint-Electrical Connection

STMicroelectronics LIS2DHTR technical specifications, attributes, parameters and parts with similar specifications to STMicroelectronics LIS2DHTR.

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