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Architecture of the combined temperature and humidity sensor. Depending on the measurement mode, one of the counters (CNT1 or CNT2) defines the reference period for the other counter. BG, bandgap circuit; REF-OSC, reference oscillator; T/RH, temperature/relative humidity; PTAT, proportional to absolute temperature; PISO, parallel-in/serial-out; DTR, data ready; SCLK, serial clock.
