SNAS817D June 2021 – November 2024 HDC3020-Q1 , HDC3021-Q1 , HDC3022-Q1
PRODUCTION DATA
Refer to the PDF data sheet for device specific package drawings
The accuracy of a temperature and relative humidity measurement is dependent upon the sensor accuracy and the setup of the sensing system. The HDC302x-Q1 measures relative humidity and temperature in the immediate environment, therefore verifying that the local conditions at the sensor match the ambient environment is critical. Use one or more openings in the physical cover over the device to obtain a good airflow even in static conditions. Conversely, avoid placing the sensor in too strong of an airflow (>1m/s typically). Strong air flows can result in large temperature and humidity result noise. Refer to the layout Figure 8-3 for a PCB layout which minimizes the thermal mass of the PCB in the region of the HDC302x-Q1, which can improve humidity response time and accuracy. Take care to avoid water condensation. Liquid water condensation on the sensor surface can result in erroneous RH readings, but also get under the package body and create electrical shorts. Placing the sensor in a vertical orientation can help condensation droplets roll off the sensor body, and prevent dust particles from landing and staying on the sensor as well. Avoid directly exposing the sensor to light. Light can both heat the sensor and accelerate the aging of the sensor, which leads to increased RH error over time.