Datasheet

www.aosong.com
DHT20 Data Sheet
Version:V1.0 —— May 2021
5 / 13
3.3 Electrical Characteristics
The power consumption given in Table 2 is related to temperature and supply voltage VDD. Refer to Figures 6 and
7 for power consumption estimation. The curves in Figures 6 and 7 are typical natural characteristics, and there
may be deviations.
Figure 6. Typical supply current vs. temperature curve (sleep mode) when VDD=3.3V
Please note: There is a deviation of approximately ±25% between these data and the displayed value.
Figure 7. The relationship between current and voltage at 25℃
Please note: The deviation of these data from the displayed value may reach ±50% of the displayed value. At 60
℃
, the
coefficient is about 15 (Compared with table 2).
4 Applications
4.1 Welding Instructions
It is forbidden to use reflow soldering or wave soldering for soldering. The manual soldering must be contacted for
less than 5 seconds at the highest temperature of 300
℃
.
Note: After welding, DHT20 need to be stored in the condition >75%RH for over 12 hours to ensure the rehydration
of the polymer. Otherwise, the output signal of the sensor will drift. The sensor can also be placed in a natural
environment (>40%RH) for more than 2 days to rehydrate it. The use of low temperature solder (for example:
180°C) can reduce the hydration time.
Do not use the sensor in corrosive gas or condensed water.