LIS3DH Accelerometer: Datasheet, Pinout, Functionality, and Block Diagram

The LIS3DH is an ultra-low-power high performance three-axis linear accelerometer belonging to the "nano" family, with digital I2C/SPI serial interface standard output. The device features ultra-low-power operational modes that allow advanced power saving and smart embedded functions.

The LIS3DH has dynamically user-selectable full scales of ±2g/±4g/±8g/±16g and 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 using two independent inertial wake-up/free-fall events as well as by the position of the device itself. Thresholds and timing of interrupt generators are programmable by the end user on the fly. The LIS3DH has an integrated 32-level first-in, first-out (FIFO) buffer allowing the user to store data in order to limit intervention by the host processor. The LIS3DH is available in small thin plastic land grid array package (LGA) and is guaranteed to operate over an extended temperature range from -40°C to +85°C.

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Footprint

3D Model

• Wide supply voltage, 1.71 V to 3.6 V

• Independent IO supply (1.8 V) and supply voltage compatible

• Ultra-low-power mode consumption down to 2 μA

• ±2g/±4g/±8g/±16g dynamically selectable full scale

• I2C/SPI digital output interface

• 16-bit data output

• 2 independent programmable interrupt generators for free-fall and motion detection

• 6D/4D orientation detection

• Free-fall detection

• Motion detection

• Embedded temperature sensor

• Embedded self-test

• Embedded 32 levels of 16-bit data output FIFO

• 10000 g high shock survivability

• ECOPACK®, RoHS and "Green" compliant

• 6D / 4D orientation detection

The LIS3DH provides the capability to detect the orientation of the device in space, enabling easy implementation of energy-saving procedures and automatic image rotation for mobile devices. The 4D detection is a subset of the 6D function especially defined to be implemented in mobile devices for portrait and landscape computation. In 4D configuration, the Z-axis position detection is disabled.

• "Sleep-to-wake" and "Return-to-sleep"

The LIS3DH can be programmed to automatically switch to low-power mode upon recognition of a determined event. Once the event condition is over, the device returns back to the preset normal or highresolution mode. To enable this function the desired threshold value must be stored inside the ACT_THS (3Eh) register while the duration value is written inside the ACT_DUR (3Fh) register. When the acceleration falls below the threshold value, the device automatically switches to low-power mode (10 Hz ODR). During this condition, the ODR[3:0] bits and the LPen bit inside CTRL_REG1 (20h) and the HR bit in CTRL_REG4 (23h) are not considered. As soon as the acceleration rises above threshold, the module restores the operating mode and ODRs as determined by the CTRL_REG1 (20h) and CTRL_REG4 (23h) settings.

• FIFO

The LIS3DH contains a 10-bit, 32-level FIFO. Buffered output allows 4 operation modes: FIFO, Stream, Stream-to-FIFO and FIFO bypass. When FIFO bypass mode is activated, FIFO is not operating and remains empty. In FIFO mode, measurement data from acceleration detection on the x, y, and z axes are stored in the FIFO buffer.

For more information, please check out the datasheet at the end of this article.

STMicroelectronics LIS3DH technical specifications, attributes, parameters and parts with similar specifications to STMicroelectronics LIS3DH.

LIS3DH electrical connections

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, 10 μF aluminum) should be placed as near as possible to pin 14 of the device (common design practice).

All the voltage and ground supplies must be present at the same time to have proper behavior of the IC (refer to the figure above). 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.

ADC1, ADC2 & ADC3 if not used can be left floating or connected to Vdd or GND.

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.

• Motion activated functions

• Free-fall detection

• Click/double-click recognition

• Intelligent power saving for handheld devices

• Pedometers

• Display orientation

• Gaming and virtual reality input devices

• Impact recognition and logging

• Vibration monitoring and compensation

LIS3DH Package Outline

LIS3DH Dimensions

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Download datasheets and manufacturer documentation for STMicroelectronics LIS3DH.