0.2 0.4 3.0 Datasheet SHT20 Humidity and Temperature Sensor IC Fully calibrated 2 Digital output, I C interface Low power consumption Excellent long term stability DFN type package reflow solderable Product Summary Every sensor is individually calibrated and tested. Lot The SHT20 humidity and temperature sensor of Sensirion identification is printed on the sensor and an electronic has become an industry standard in terms of form factor identification code is stored on the chip which can be and intelligence: Embedded in a reflow solderable Dual read out by command. Furthermore, the resolution of Flat No leads (DFN) package of 3 x 3mm foot print and SHT2can be changed by command (8/12bit up to 12/14bit 1.1mm height it provides calibrated, linearized sensor 2 for RH/T) and a checksum helps to improve signals in digital, I C format. communication reliability. The SHT2x sensors contain a capacitive type humidity With this set of features and the proven reliability and sensor, a band gap temperature sensor and specialized long-term stability, the SHT2x sensors offer an analog and digital integrated circuit all on a single outstanding performance-to-price ratio. For testing SHT2x CMOSens chip. This yields in an unmatched sensor two evaluation kits EK-H4 and EK-H5 are available. performance in terms of accuracy and stability as well as minimal power consumption. Dimensions Sensor Chip 3.0 SHT20 features a generation 4C CMOSens chip. Besides the capacitive relative humidity sensor and the 0.3 typ band gap temperature sensor, the chip contains an amplifier, A/D converter, OTP memory and a digital processing unit. 1.4 max 1.1 2.2 Material Contents While the sensor itself is made of Silicon the sensors Bottom housing consists of a plated Cu lead-frame and green View epoxy-based mold compound. The device is fully RoHS 0.4 0.3 NC VDD SCL and WEEE compliant, e.g. free of Pb, Cd and Hg. 2.4 Additional Information and Evaluation Kits Additional information such as Application Notes is available from the web page www.sensirion.com/SHT20. 1.0 1.0 VSS SDA NC For more information please contact Sensirion via info sensirion.com. Figure 1: Drawing of SHT20 sensor package, dimensions are For SHT20 two Evaluation Kits are available: EK-H4, a given in mm (1mm = 0.039inch), tolerances are 0.1mm. The four-channel device with Viewer Software, that also serves die pad (center pad) is internally connected to VSS. The NC pads must be left floating. VSS = GND, SDA = DATA. for data-logging, and a simple EK-H5 directly connecting Numbering of E/O pads starts at lower right corner (indicated by one sensor via USB port to a computer. notch in die pad) and goes clockwise (compare Table 2). www.sensirion.com Version 4 May 2014 1/14 0.75 1.5 2.4 max SHT20 D0AC4 Sensor Performance 1234 567 Relative Humidity Temperature Parameter Condition Value Units Parameter Condition Value Units 12 bit 0.04 %RH 14 bit 0.01 C 1 1 Resolution Resolution 8 bit 0.7 %RH 12 bit 0.04 C typ %RH typ C 3.0 0.3 Accuracy Accuracy 2 2 tolerance tolerance max see Figure 2 %RH max see Figure 3 C Repeatability 0.1 %RH Repeatability 0.1 C 4 Hysteresis %RH Operating Range extended -40 t0 125 C 1 7 Nonlinearity <0.1 %RH Response Time 63% 5 to 30 s 3 8 Response time 8 s Long Term Drift Typ. < 0.02 C/yr 63% 4 Operating Range extended 0 to 100 %RH 5 Long Term Drift Typ. < 0.25 %RH/yr RH (%RH) T (C) 10 2.0 maximum accuracy maximum accuracy 8 typical accuracy typical accuracy 1.5 6 1.0 4 0.5 2 0.0 0 -40 -20 0 20 40 60 80 100 120 0 10 20 30 40 50 60 70 80 90 100 Relative Humidity (%RH) Temperature (C) Figure 3 Typical and maximal tolerance for temperature sensor Figure 2 Typical and maximal tolerance at 25C for relative in C. humidity. For extensive information see Users Guide, Sect. 1.2. Electrical Specification Packaging Information Parameter Condition min typ max Units Sensor Type Packaging Quantity Order Number Supply Voltage, VDD 2.1 3.0 3.6 V Tape & Reel 1500 1-100706-01 sleep mode 0.15 0.4 A SHT20 6 Supply Current, IDD Tape & Reel 5000 1-100704-01 measuring 200 300 330 A sleep mode 0.5 1.2 W 6 measuring Power Dissipation 0.6 0.9 1.0 mW average 8bit 3.2 W VDD = 3.0 V 5.5mW, T = + 0.5-1.5C Heater 2 Communication digital 2-wire interface, I C protocol This datasheet is subject to change and may be amended Table 1 Electrical specification. For absolute maximum without prior notice. values see Section 4.1 of Users Guide. 1 5 Default measurement resolution is 14bit (temperature) / 12bit (humidity). It can Typical value for operation in normal RH/T operating range. Max. value is < 0.5 be reduced to 12/8bit, 11/11bit or 13/10bit by command to user register. %RH/y. Value may be higher in environments with vaporized solvents, out- 2 gassing tapes, adhesives, packaging materials, etc. For more details please Accuracies are tested at Outgoing Quality Control at 25C and 3.0V. Values refer to Handling Instructions. exclude hysteresis and long term drift and are applicable to non-condensing 6 Min and max values of Supply Current and Power Dissipation are based on environments only. 3 fixed VDD = 3.0V and T<60C. The average value is based on one 8bit Time for achieving 63% of a step function, valid at 25C and 1m/s airflow. measurement per second. 4 Normal operating range: 0-80%RH, beyond this limit sensor may read a 7 Response time depends on heat conductivity of sensor substrate. reversible offset with slow kinetics (+3%RH after 60h at humidity >80%RH). For 8 Max. value is < 0.04C/y. more details please see Section 1.1 of the Users Guide. www.sensirion.com Version 4 May 2014 2/14