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This document intention is to provide some tips and basic considerations when using ADI ADXL accelerometers. We thank you for choosing ADI and want to let you know that our main focus is to offer High Performance Inertial Sensors for the most demanding applications.
The first and most important advise we would like to offer when using our ADXL portfolio is to carefully read the product datasheet, this can save you precious time.
It is important to respect the power supply limits and considerations described in the datasheet.
Some products, e.g. ADXL313, specifies that VS and VDDIO can be applied in any sequence without damaging the part, whereas the the ADXL355 specifies that, VS cannot be powered before VDDIO.
Generally it is recommend to use a 0.1uF ceramic capacitor and a 1-to-10uF tantalum capacitor between VS/VDDIO. Following this recommendation is very important to meet the datasheet specifications, for example in terms of noise level.
It is common in ULP applications to power cycle the accelerometer to reduce power consumption. When using this technique, please remember that it is highly recommend to always start up the accelerometer from ground level (0 V) to ensure proper operation. If this is not possible, care must be taken regarding the following specifications:
Hold time and rise time specifications can vary. For example, if hold time is much longer than 100ms, the rise time criteria might be relaxed. The user should carefully select the start-up specifications that suits their application.
To enable supply discharge, it is recommended to power the device from a microcontroller general-purpose input/output (GPIO), connect a shutdown discharge switch to the supply, or use a voltage regulator with a shutdown discharge feature.