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Probes
based on the HygroClip® technology include two
main subsystems:
·
ASIC (Application Specific Integrated Circuit): this custom
designed circuit measures both the capacitive humidity sensor
and the Pt100 RTD and converts the measurements into digital
counts. The ASIC also includes two D/A converters that convert
the data from the micro controller into analog output signals.
The ASIC regulates all supply voltages and generates the reset
and clock signals for the micro controller.
· Micro controller / EEPROM:
the micro controller uses the counts generated by the ASIC
to compute the value of humidity and temperature. Calibration
data, linearization and other sensor data are memorized in
the EEPROM. The micro controller sends data both to the DIO
pin (digital output signal) and to the ASIC (analog output
signal).
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