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STS30 Datasheet(PDF) 10 Page - List of Unclassifed Manufacturers |
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STS30 Datasheet(HTML) 10 Page - List of Unclassifed Manufacturers |
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10 / 17 page ![]() www.sensirion.com November 2016 - Version 1 10/17 Bit Field description Default value 15 Alert pending status '0': no pending alerts '1': at least one pending alert ‘1’ 14 Reserved ‘0’ 13 Heater status ‘0’ : Heater OFF ‘1’ : Heater ON ‘0’ 12:11 Reserved ‘00’ 10 T tracking alert ‘0’ : no alert ‘1’ . alert ‘0’ 9:5 Reserved ‘xxxxx’ 4 System reset detected '0': no reset detected since last ‘clear status register’ command '1': reset detected (hard reset, soft reset command or supply fail) ‘1’ 3:2 Reserved ‘00’ 1 Command status '0': last command executed successfully '1': last command not processed. It was either invalid, failed the integrated command checksum ‘0’ 0 Write data checksum status '0': checksum of last write transfer was correct '1': checksum of last write transfer failed ‘0’ Table 16 Description of the status register. 4.11 Checksum Calculation The 8-bit CRC checksum transmitted after each data word is generated by a CRC algorithm. Its properties are displayed in Table 17. The CRC covers the contents of the two previously transmitted data bytes. To calculate the checksum only these two previously transmitted data bytes are used. Property Value Name CRC-8 Width 8 bit Protected data read and/or write data Polynomial 0x31 (x8 + x5 + x4 + 1) Initialization 0xFF Reflect input False Reflect output False Final XOR 0x00 Examples CRC (0xBEEF) = 0x92 Table 17 I2C CRC properties. 4.12 Conversion of Signal Output Measurement data is always transferred as 16-bit values (unsigned integer). These values are already linearized and compensated for supply voltage effects. Converting those raw values into a physical scale can be achieved using the following formulas. Temperature conversion formula (result in °C & °F): 1 1 16 T 16 T 2 S 315 49 F T 2 S 175 45 C T ST denotes the raw sensor output for temperature. The formulas work only correctly when ST is used in decimal representation. |
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