DESCRIPTION
The AHT21B is a kind of sensor of humidity and temperature with digital I²C output. It can be applied to HVAC, dehumidifier, testing and inspection equipment, consumer products, automobiles, automatic control, data loggers, weather stations, home appliances, humidity control, medical and other application fields which need to detect and control temperature and humidity. Figure 1. ATH21B Version:V1.0 —— May 2021 1 / 13 ATH21B Data Sheet 2 Sensor Specifications Relative Humidity Parameter Condition Resolution Accuracy Tolerance1 Repeatable Typical Typical Max - Hysteresis - Nonlinear - Response Time2 63% Scope of Work Extended3 Prolonged Drift4 Normal Table 1. Humidity characteristics table Min Typical Value Max Unit - 0.024 - %RH - ±3 - %RH See Figure 2 - %RH - ±0.1 - %RH - ±1 - %RH - <0.1 - %RH - <8 - s 0 - 100 %RH - <1 - %RH/yr Figure 2. Typical and maximum humidity errors ELECTRICAL SPECIFICATIONS
Parameter Condition Min Typical Value Max Supply Voltage Typical 2.2 3.3...
