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9

TH08 datasheet

4. Functional Description

Vdd

TH08

Humidity

Sensor

Temp

Sensor

1.25V

Ref

ADC

Calibration

Memory

Control Logic

SDA

SCL

GND

Figure 5. TH08 Block Diagram

The TH08 is a digital relative humidity and temperature sensor that integrates temperature and humidity sensor

elements, an analog-to-digital converter, signal processing, calibration, polynomial non-linearity correction, and an

with the calibration data stored in on-chip non-volatile memory. This ensures that the sensor is fully

interchangeable, with no recalibration or changes to software required. Patented use of industry-standard CMOS

and low-K dielectrics as a sensor enables the TH08 to achieve excellent long term stability and immunity to

contaminants with low drift and hysteresis. The TH08 offers a low power, high accuracy, calibrated and stable

solution ideal for a wide range of temperature, humidity, and dew-point applications including medical and

instrumentation, high reliability automotive and industrial systems, and cost-sensitive consumer electronics.

While the TH08 is largely a conventional mixed-signal CMOS integrated circuit, relative humidity sensors in

general and TH0se based on capacitive sensing using polymeric dielectrics have unique application and use

requirements that are not common to conventional (non-sensor) ICs. Chief among TH0se 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 senor from damage or contamination during the product life-cycle.



The impact of prolonged exposure to extremes of temperature and/or humidity and their potential effect on

sensor accuracy.



The effects of humidity sensor “memory”.

Each of these items is discussed in more detail in the following sections.