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resources:technical-guides:best_engineering_practices_when_using_adxl_accelerometers [29 Mar 2021 19:37] – Pablo del Corro | resources:technical-guides:best_engineering_practices_when_using_adxl_accelerometers [15 Mar 2022 14:41] (current) – Pablo del Corro | ||
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The first and most important advise we would like to offer when using our ADXL portfolio is to **carefully read the product datasheet**, | The first and most important advise we would like to offer when using our ADXL portfolio is to **carefully read the product datasheet**, | ||
- | ===== Terminology | + | ===== Common terminology in ADXL's datasheet specifications |
=== Full-Scale Range (FSR) === | === Full-Scale Range (FSR) === | ||
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===== Power supply considerations ===== | ===== Power supply considerations ===== | ||
- | It is important to respect the power supply limits and considerations described in the datasheet. | + | It is important to respect the power supply limits and considerations described in the datasheet. |
- | + | ||
- | <note tip>As a general rule, it is __highly recommended__ to always be started up the accelerometer | + | |
=== Recommended VS and VDDIO power sequencing === | === Recommended VS and VDDIO power sequencing === | ||
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=== Power Cycling === | === Power Cycling === | ||
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. | 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. | ||
+ | |||
+ | <note tip>As a general rule, it is __highly recommended__ to always be started up the accelerometer from ground level (0 V).</ | ||
+ | |||
If this is not possible, care must be taken regarding the following specifications: | If this is not possible, care must be taken regarding the following specifications: | ||
- | * __**VS supply start-up threshold**__: During start-up or power cycling, the VS and VDDIO supplies must always be started up from below 100 mV. When the device is in operation, any time power is removed or falls below the accelerometer power supply lower range voltage, VS and VDDIO supplies must be discharged below 100 mV. **This specification is mandatory**. | + | * __**V <wrap lo> |
- | * __**Hold time**__: VS and VDDIO supplies must be held below 100 mV for at least 200 ms before re-powering the part. | + | * __**Hold time**__: VS and VDDIO supplies must be held below V_RESET |
- | * __**Rise time**__: | + | * __**Rise time**__: |
+ | |||
+ | {{ : | ||
- | {{ :resources:technical-guides:adxl372_revc_por_graph.jpg? | + | For example for the ADXL362 and ADXL37x devices, the power cycling requirements are: |
+ | * __**V <wrap lo> | ||
+ | * __**Hold time**__: equal or grater than 200 [ms]. | ||
+ | * __**Rise time**__: should be linear and with a slope equal or higher than 6 [V/ms]. | ||
- | < | + | < |
| | ||
To enable supply discharge, it is recommended to power the device from a microcontroller general-purpose input/ | To enable supply discharge, it is recommended to power the device from a microcontroller general-purpose input/ |