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• Drift Correction
– The Drift Correction Algorithm calibrates the device and corrects any observed sensor drift that may be
encountered due to device mishandling or exposure to contaminants. This feature is not supported in Auto
Measurement Mode and the device can only support this algorithm if the drift is less than 25% RH. If the
observed drift after running this algorithm is greater than 25%, then the error is only reduced by (actual
drift - 25%)
– Figure 5-3 describes the different layout considerations that can be implemented on the HDC devices. The
EVM and the layout with the cutout would require lower current to execute the Drift Correction Algorithm.
However, the layout that has little to no thermal isolation would require a lot more current to execute this
command. The HDC3020EVM GUI offers three different power levels to run this algorithm: Min Power,
Mid Power and Max Power
Figure 5-3. Thermal Isolation Examples
– This feature is currently only available for a demonstration purpose on the HDC3020EVM. The power
settings are specifically chosen to correct the drift on the HDC3020EVM and code compensates for this
layout.
Note
The Max power should only be used when there is no thermal isolation on the PCB. Using this
setting for more than 5 minutes can damage the sensor.
www.ti.com GUI Operation
SNAU267A – JUNE 2021 – REVISED JUNE 2021
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HDC3020EVM User Guide 11
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