Overview: Datasheet SHT21P
Humidity and Temperature Sensor IC Fully calibrated Analog output, PWM interface Low power consumption Excellent long term stability DFN type package – reflow solderable Product Summary The SHT21 humidity and temperature sensor of Sensirion has bee an industry standard in terms of form factor and intelligence: Embedded in a reflow solderable Dual Flat No leads (DFN) package of 3 x 3mm foot print and 1.1mm height it provides calibrated, linearized sensor signals in analog Pulse Width Modulated (PWM) format. The SHT2x sensors contain a capacitive type humidity sensor, a band gap temperature sensor and specialized analog and digital integrated circuit – all on a single CMOSens® chip. This yields in an unmatched sensor performance in terms of accuracy and stability as well as minimal power consumption. PWM signal runs on a base frequency of 120Hz, the data signal is provided on SDA line. Pulling SCL high or low allows for switching between humidity and temperature, respectively. The sensor measures twice per second. The PWM signal may be converted to an analog ratiometric interface by adding a low pass filter. Every sensor is individually calibrated and tested. Lot identification is printed on the sensor.
