LIS2DTW12
65Pages

Catalog excerpts

Product status link Features • Ultra-low power consumption: 50 nA in power-down mode, below 1 pA in active low-power mode • Very low noise: down to 1.3 mg RMS in low-power mode • 0.8 °C (typ. accuracy) embedded temperature sensor • Multiple operating modes with multiple bandwidths • Android stationary detection, motion detection • Supply voltage, 1.62 V to 3.6 V • High-speed I2C/SPI digital output interface • Single data conversion on demand • 16-bit accelerometer data output • 12-bit temperature data output • 10000 g high shock survivability • ECOPACK, RoHS and “Green” compliant • Fragile shipment tracking • Motion and temperature monitoring in battery-powered devices • Gesture recognition and gaming • Motion-activated functions and user interfaces • Display orientation • Tap/double-tap recognition • Free-fall detection • Smart power saving for handheld devices • Hearing aids • Portable healthcare devices • Wireless sensor nodes • Motion-enabled metering devices Description The LIS2DTW12 is an ultra-low-power high-performance three-axis linear accelerometer and temperature sensor belonging to the “femto” family which leverages on the robust and mature manufacturing processes already used for the production of micromachined accelerometers. The device has user-selectable full scales of ±2g/±4g/±8g/±16g and is capable of measuring accelerations with output data rates from 1.6 Hz to 1600 Hz. The LIS2DTW12 has an embedded 0.8 °C (typ. accuracy) temperature sensor with ODRs ranging from 50 to 1.6 Hz and resolution from 8 to 12 bits. DS12825 - Rev 3 - July 2019 For further information con

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The LIS2DTW12 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 embedded self-test capability allows the user to check the functioning of the sensor in the final application. The device has a dedicated internal engine to process motion and acceleration detection including free-fall, wakeup, highly configurable single/double-tap recognition, activity/inactivity, stationary/motion detection, portrait/landscape detection and 6D/4D orientation. The LIS2DTW12 is available in a small thin plastic...

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LIS2DTW12 Block diagram and pin description Block diagram and pin description Block diagram Figure 1. Block diagram X+ Y+ CONTROL LOGIC TEMPERATURE SENSOR SELF TEST TRIMMING CIRCUITS CONTROL LOGIC & INTERRUPT GEN.

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1.2 Pin description Figure 2. Pin connections 10 111 | 12 |T]2 (TOPVIEW) DIRECTION OF THE DETECTABLE ACCELERATIONS (BOTTOM VIEW) 1. SDO/SA0 and CS pins are internally pulled up. Refer to Table 2. Internal pull-up values (typ.) for SDO/SA0 and CS pins for the internal pull-up values (typ).

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Table 2. Internal pull-up values (typ.) for SDO/SA0 and CS pins

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LIS2DTW12 Mechanical and electrical specifications @ Vdd = 1.8 V, T = 25 °C unless otherwise noted. The product is factory calibrated at 1.8 V. The operational power supply range is from 1.62 V to 3.6 V. Table 3. Mechanical characteristics 1. Typical specifications are not guaranteed. 2. Noise density is the same for all ODRs. Low-noise setting enabled. 3. RMS noise is the same for all ODRs. Low-noise setting enabled. 4. Values after factory calibration test and trimming.

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Table 4. Electrical characteristics 1. Typical specifications are not guaranteed. 2. It is possible to remove Vdd maintaining Vdd_IO without blocking the communication busses. In this condition the measurement chain is powered off. 3. Low-noise setting disabled. 4. Low-Power Mode 1. Low-noise setting disabled. 5. 4 mA is the maximum driving capability, ie. the maximum DC current that can be sourced/sunk by the digital pad in order to guarantee the correct digital output voltage levels Vqh and Vql.

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LIS2DTW12 Temperature sensor characteristics @ Vdd = 1.8 V, T = 25 °C unless otherwise noted. Table 5. Temperature sensor characteristics 1. Typical specifications are not guaranteed.

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LIS2DTW12 Communication interface characteristics 2.4.1 SPI - serial peripheral interface Subject to general operating conditions for Vdd and Top. Table 6. SPI slave timing values Note: Measurement points are done at 0.2Vdd_IO and 0.8Vdd_IO, for both input and output ports.

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LIS2DTW12 Communication interface characteristics Table 7. PC slave timing values 1. Data based on standard I2C protocol requirement, not tested in production. Figure 4. PC slave timing diagram Note: Measurement points are done at 0.2-VddJO and 0.8-VddJO, for both ports. page 10/65

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LIS2DTW12Communication interface characteristics Table 8. PC high-speed mode specifications at 1 MHz and 3.4 MHz

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LIS2DTW12 Absolute maximum ratings 2.5 Absolute maximum ratings Stresses above those listed as “absolute maximum ratings” may cause permanent damage to the device. This is a stress rating only and functional operation of the device under these conditions is not implied. Exposure to maximum rating conditions for extended periods may affect device reliability. Table 9. Absolute maximum ratings This device is sensitive to mechanical shock, improper handling can cause permanent damage to the part. This device is sensitive to electrostatic discharge (ESD), improper handling can cause permanent...

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Sensitivity Sensitivity describes the gain of the sensor and can be determined by applying 1 g acceleration to it. As the sensor can measure DC accelerations this can be done easily by pointing the axis of interest towards the center of the Earth, noting the output value, rotating the sensor by 180 degrees (pointing to the sky) and noting the output value again. By doing so, ±1 g acceleration is applied to the sensor. Subtracting the larger output value from the smaller one, and dividing the result by 2, leads to the actual sensitivity of the sensor. This value changes very little over...

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