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The HDC2010 is the only member of the HDC20xx family available in the 1.5mm × 1.5mm WLCSP/DSBGA package. The innovative DSBGA package of the HDC2010 has the RH sensing element placed on the underside of the device, rather than the topside (see Figure 1-1 ). The WLCSP package makes the HDC2010 an effective solution for cost- or space-constrained applications. For additional device information, see the HDC2010 data sheet.
The HDC2080 is the standard WSON device in the HDC20xx family, with no additional protection over the RH sensor window. Unlike the HDC2021 and HDC2022, the sensor window on the HDC2080 is not centered (see Figure 1-2). When using the HDC2080, care should be taken to ensure all of the requirements in Section 2 are followed. For more information on the HDC2080, please see the HDC2080 data sheet.
The HDC2021 is pin-to-pin compatible with the HDC2080 and HDC2022. Unlike the HDC2080, the sensor opening on the HDC2021 is centered at the top of the package, and protected by a factory-installed polyimide cover tape (see Figure 1-3). The tape protects the humidity sensor element from pollutants that can be produced as part of the manufacturing process, such as SMT assembly, PCB board wash, and conformal coating. The tape must be removed after the final stages of assembly for accurate measurement of relative humidity in the ambient environment. For more device information, please see the HDC2021 data sheet.
The HDC2022 is identical to the HDC2021, but instead of the removable assembly tape, this device features an IP67 rated hydrophobic protective PTFE membrane over the sensing element (see Figure 1-4). This filter is intended to be left for the lifetime of the device, and protects with 99.99% filtration efficiency for particles down to 100 nm in size. For more information on the HDC2022 and filter, see the HDC2022 data sheet.