TH02 Datasheet, PDF (21/26 Pages) List of Unclassifed Manufacturers – D IGITAL I 2C H UMIDITY AND TEMPERATURE S ENSOR

TH02
4 . TH02 Connection Diagrams
The TH02 is a simple-to-use device requiring a minimum of external components. Figure 2 shows the typical
connection diagram for the TH02 connected to an MCU. The values for the two I²C pull-up resistors depend on the
capacitance of the I²C bus lines and the desired speed of operation.
For ultra-low-power operation, such as in battery-powered applications. In this case, the TH02 is powered from
one of the MCU’s GPIOs. The GPIO can be driven high to powerup the TH02, once the measurement results are
obtained, the GPIO can be driven low to power-down the TH02, reducing its current consumption to zero. The GPIO
must be capable of sourcing 320 µA for the duration of the conversion time (<200 ms for relative humidity and
temperature conversions) and up to 40 mA for a period of
5 ms at power-up. The GPIO must also be capable of sinking up to 40 mA for a period of 5 ms at powerdown. If the
GPIO is not capable of sourcing/sinking 40 mA, then the TH02 will take longer to powerup and powerdown.
Figure 2. Recommended Connection Diagram for Low-Power Battery Operation
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