0.4 3.0 0.2 Datasheet SHT25 Humidity and Temperature Sensor IC Fully calibrated with 1.8%RH accuracy 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 SHT25 high accuracy humidity and temperature identification is printed on the sensor and an electronic sensor of Sensirion has become an industry standard in identification code is stored on the chip which can be terms of form factor and intelligence: Embedded in a read out by command. Furthermore, the resolution of reflow solderable Dual Flat No leads (DFN) package of 3 SHT2x can be changed by command (8/12bit up to x 3mm foot print and 1.1mm height it provides calibrated, 2 12/14bit for RH/T) and a checksum helps to improve linearized sensor 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 SHT25 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 2.2 1.1 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/sht25. 1.0 VSS SDA 1.0 NC For more information please contact Sensirion via info sensirion.com. Figure 1: Drawing of SHT25 sensor package, dimensions are For SHT25 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 3 May 2014 1/14 0.75 1.5 2.4 max SHT21 D0AC4 Sensor Performance 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 1.8 0.2 2 2 Accuracy tolerance Accuracy tolerance max see Figure 2 %RH max see Figure 3 Repeatability 0.1 %RH Repeatability 0.1 C 4 Hysteresis %RH Operating Range extended -40 to 125 C 1 6 Nonlinearity <0.1 %RH Response Time 63% 5 to 30 s 3 7 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 DRH (%RH) DT (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 0 10 20 30 40 50 60 70 80 90 100 -40 -20 0 20 40 60 80 100 120 Relative Humidity (%RH) Temperature (C) Figure 2 Typical and maximal tolerance at 25C for relative Figure 3 Maximal tolerance for temperature sensor in C. humidity. For extensive information see Users Guide, Sect. 1.2. Packaging Information Electrical Specification Parameter Conditions min typ max Units Sensor Type Packaging Quantity Order Number Tape & Reel 400 1-100769-01 Supply Voltage, VDD 2.1 3.0 3.6 V SHT25 sleep mode Tape & Reel 1500 1-100768-01 - 0.15 0.4 A 8 Supply Current, IDD measuring 200 300 330 A sleep mode - 0.5 1.2 W 8 measuring Power Dissipation 0.6 0.9 1.0 mW average 8bit - 3.2 - W VDD = 3.0 V Heater 5.5mW, DT = + 0.5-1.5C 2 Communication digital 2-wire interface, I C protocol Table 1 Electrical specification. For absolute maximum 1 Default measurement resolution is 14bit (temperature) / 12bit (humidity). It can values see Section 4.1 of Users Guide. be reduced to 12/8bit, 11/11bit or 13/10bit by command to user register. 2 Accuracies are tested at Outgoing Quality Control at 25C and 3.0V. Values This datasheet is subject to change and may be amended exclude hysteresis and long term drift and are applicable to non-condensing environments only. without prior notice. 3 Time for achieving 63% of a step function, valid at 25C and 1m/s airflow. 4 Normal operating range: 0-80%RH, beyond this limit sensor may read a reversible offset with slow kinetics (+3%RH after 60h at humidity >80%RH). For 6 Response time depends on heat conductivity of sensor substrate. more details please see Section 1.1 of the Users Guide. 7 5 Max. value is < 0.04C/y. Typical value for operation in normal RH/T operating range. Max. value is < 0.5 8 Min and max values of Supply Current and Power Dissipation are based on %RH/y . Value may be higher in environments with vaporized solvents, out- gassing tapes, adhesives, packaging materials, etc. For more details please fixed VDD = 3.0V and T<60C. The average value is based on one 8bit refer to Handling Instructions. measurement per second. www.sensirion.com Version 3 May 2014 2/14