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HDC1080 データシート(PDF) 18 Page - Texas Instruments |
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HDC1080 データシート(HTML) 18 Page - Texas Instruments |
18 / 26 page HDC1080 SNAS672A – NOVEMBER 2015 – REVISED JANUARY 2016 www.ti.com Typical Application (continued) 9.2.2 Detailed Design Procedure When a circuit board layout is created from the schematic shown in Figure 15 a small circuit board is possible. The accuracy of a RH and temperature measurement depends on the sensor accuracy and the setup of the sensing system. The HDC1080 samples relative humidity and temperature in its immediate environment, it is therefore important that the local conditions at the sensor match the monitored environment. Use one or more openings in the physical cover of the thermostat to obtain a good airflow even in static conditions. Refer to the layout below ( Figure 18) for a PCB layout which minimizes the thermal mass of the PCB in the region of the HDC1080, which can improve measurement response time and accuracy. 9.2.3 Application Curve The data shown below was acquired with the HDC1080EVM. A humidity chamber was used to control the environment. Figure 16. RH vs. Time 9.3 Implementation and Usage Recommendations 9.3.1 Soldering When soldering the HDC1080 use the standard soldering profile IPC/JEDEC J-STD-020 with peak temperatures of 260 °C. When soldering the HDC1080 it is mandatory to use no-clean solder paste and no board wash should be applied. The HDC1080 should be limited to a single IR reflow and no rework is recommended. 9.3.2 Chemical Exposure and Sensor Protection The humidity sensor is not a standard IC and therefore should not be exposed to particulates or volatile chemicals such as solvents or other organic compounds. If any type of protective coating must be applied to the circuit board, the sensor must be protected during the coating process. 9.3.3 High Temperature and Humidity Exposure Long exposure outside the recommended operating conditions may temporarily offset the RH output. Table 10 shows the RH offset values that can be expected for exposure to 85 °C and 85 % RH for durations between 12 and 500 hours (continuous). 18 Submit Documentation Feedback Copyright © 2015–2016, Texas Instruments Incorporated Product Folder Links: HDC1080 |
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