TH02 Datasheet, PDF (8/26 Pages) List of Unclassifed Manufacturers – D IGITAL I 2C H UMIDITY AND TEMPERATURE S ENSOR

Notes:
1. The TH02 has a nominal output of 32 codes /°C, with 0000 = –50 °C
2. Temperature sensor accuracy is for V_DD = 2.3 to 3.6 V.
3. Actual response times will vary dependent on system thermal mass and air-flow.
TH02
Table 7. Absolute Maximum Ratings^1,2
Parameter
Ambient Temperature under Bias
Symbol
Test
Min
Typ
Condition
–55
—
Storage Temperature
–65
—
Voltage on SDA or SCL pin with respect
to GND
–0.3
—
Max
Unit
125
°C
150
°C
3.9
V
Voltage on V_DD with respect to GND
–0.3
—
4.2
V
Notes:
1. Absolute maximum ratings are stress ratings only; operation at or beyond these conditions is not implied and may
shorten the life of the device or alter its performance.
2. For best accuracy, after removal from the sealed shipping bags, the TH02 should be stored in climate controlled
conditions (10 to 35 °C, 20 to 60 %RH). Exposure to high temperature and/or high humidity environments can cause a
small upwards shift in RH readings.
2. Functional Description
2.1. Overview
The TH02 is a digital relative humidity and temperature sensor. This monolithic CMOS IC integrates temperature
and humidity sensor elements, an analog-to-digital converter, signal processing, calibration data, and an I²C host
interface. Both the temperature and humidity sensors on each unit are factory-calibrated and the calibration data is
stored in the on-chip non-volatile memory. This ensures that the sensors are fully interchangeable, with no
recalibration or software changes required.
While the TH02 is largely a conventional mixed-signal CMOS integrated circuit, relative humidity sensors in
general and those based on capacitive sensing using polymeric dielectric have unique application and use
requirements that are not common to conventional (non-sensor) ICs. Chief among those are:
The need to protect the sensor during board assembly, i.e., solder reflow, and the need to subsequently
rehydrate the sensor.
The need to protect the sensor from damage or contamination during the product life-cycle
The impact of prolonged exposure to extremes of temperature and/or humidity and their potential affect on
sensor accuracy
The effects of humidity sensor "memory"
The need to apply temperature correction and linearization to the humidity readings
Each of these items is discussed in more detail in the following sections.
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