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1-100645-01 Datasheet(PDF) 9 Page - Sensitron |
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1-100645-01 Datasheet(HTML) 9 Page - Sensitron |
9 / 12 page Datasheet SHT21 www.sensirion.com Version 1.0 – January 2010 9/12 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 S 1 0 0 0 0 0 0 0 1 1 1 0 0 1 1 1 I2C address + write Read Register 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 S 1 0 0 0 0 0 0 1 0 0 0 0 0 0 1 0 I2C address + read Register content 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 S 1 0 0 0 0 0 0 0 1 1 1 0 0 1 1 0 I2C address + write Write Register 55 56 57 58 59 60 61 62 63 0 0 0 0 0 0 1 1 P Register content to be written Figure 16 Read and write register sequence – grey blocks are controlled by SHT2x. In this example, the resolution is set to 8bit / 12bit. 5.7 CRC Checksum For implementing CRC8 checksum please refer to Wikipedia (http://en.wikipedia.org/wiki/crc8). 5.8 Serial Number SHT21 provides an electronic identification code. For instructions on how to read the identification code please refer to the Application Note “Electronic Identification Code” – to be downloaded from the web page www.sensirion.com/SHT21. 6 Conversion of Signal Output Default resolution is set to 12 bit relative humidity and 14 bit temperature reading. Measured data are transferred in two byte packages, i.e. in frames of 8 bit length where the most significant bit (MSB) is transferred first (left aligned). Each byte is followed by an acknowledge bit. The two status bits, the last bits of LSB, must be set to ‘0’ before calculating physical values. In the example of Figure 13 and Figure 14, the transferred 16 bit relative humidity data is ‘0110’0011’0101’0000’ = 25424. 6.1 Relative Humidity Conversion With the relative humidity signal output SRH the relative humidity RH is obtained by the following formula (result in %RH), no matter which resolution is chosen: 16 RH 2 S 125 6 RH In the example given in Figure 13 and Figure 14 the relative humidity results to be 42.5%RH. The physical value RH given above corresponds to the relative humidity above liquid water according to World Meteorological Organization (WMO). For relative humidity above ice RHi the values need to be transformed from relative humidity above water RHw at temperature t. The equation is given in the following, compare also Application Note “Introduction to Humidity: t λ t β t λ t β RH RH i i w w w i exp exp Units are %RH for relative humidity and °C for temperature. The corresponding coefficients are defined as follows: βw = 17.62, λw = 243.12°C, βi = 22.46, λi = 272.62°C. 6.2 Temperature Conversion The temperature T is calculated by inserting temperature signal output ST into the following formula (result in °C), no matter which resolution is chosen: 16 T 2 S 175.72 46.85 T 7 Environmental Stability The SHT2x sensor series were tested according to AEC- Q100 Rev. F qualification test method. Sensor specifications are tested to prevail under the AEC-Q100 temperature grade 2 test conditions listed in Table 917. Sensor performance under other test conditions cannot be guaranteed and is not part of the sensor specifications. Especially, no guarantee can be given for sensor performance in the field or for customer’s specific application. Environment Standard Results18 HTSL 125°C, 1000 hours Within specifications TC -50°C - 125°C, 1000 cycles Acc. JESD22-A104-C Within specifications UHST 130°C / 85%RH, 96h Within specifications THU 85°C / 85%RH, 1000h Within specifications ESD immunity MIL STD 883E, method 3015 (Human Body Model at ±2kV) Qualified Latch-up force current of ±100mA with Tamb = 80°C, acc. JEDEC 17 Qualified Table 9: Qualification tests: HTSL = High Temperature Storage Lifetime, TC = Temperature Cycles, UHST = Unbiased Highly accelerated Stress Test, THU = Temperature Humidity Unbiased. 17 Sensor operation temperature range is -40 to 105°C according to AEC-Q100 temperature grade 2. 18 According to accuracy and long term drift specification given on Page 2. |
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