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SHTW2 Datasheet(PDF) 7 Page - List of Unclassifed Manufacturers |
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7 / 14 page www.sensirion.com Version 2 – August 2016 7/14 be sent to SHTW2 according to Figure 8. This triggers the sensor to reset all internal state machines and reload calibration data from the memory. Command Hex. Code Bin. Code Software reset 0x805D 1000’0000’0101’1101 Table 10 Soft reset command. 5.7 Read-out of ID Register The SHTW2 has an ID register which contains an SHTW2- specific product code. The read-out of the ID register can be used to verify the presence of the sensor and proper communication. The command to read the ID register is shown in Table 11. Command Hex. Code Bin. Code Read ID register 0xEFC8 1110’1111’1100’1000 Table 11 Read-out command of ID register. It needs to be sent to the SHTW2 after an I2C write header. After the SHTW2 has acknowledged the proper reception of the command, the master can send an I2C read header and the SHTW2 will submit the 16-bit ID followed by 8 bits of CRC. The structure of the ID is described in Table 12. 16-bit ID xxxx'xxxx’xx 00’0111 bits 5 to 0: SHTW2-specific product code bits 15 to 6: unspecified information Table 12 Structure of the 16-bit ID. Bits 15:6 of the ID contain unspecified information (marked as “x”), which may vary from sensor to sensor, while bits 5:0 contain the SHTW2-specific product code. 5.8 Checksum Calculation The 8-bit CRC checksum transmitted after each data word is generated by a CRC algorithm with the properties displayed in Table 13. The CRC covers the contents of the two previously transmitted data bytes. Property Value Name CRC-8 Width 8 bits Polynomial 0x31 (x8 + x5 + x4 + 1) Initialization 0xFF Reflect input False Reflect output False Final XOR 0x00 Examples CRC (0x00) = 0xAC CRC (0xBEEF) = 0x92 Table 13 SHTW2 I2C CRC properties. 5.9 Conversion of Signal Output Measurement data is always transferred as 16-bit values. These values are already linearized and temperature compensated by the SHTW2. Humidity and temperature values can be calculated with the formulas in given below. Relative humidity conversion formula (result in %RH): 16 RH 2 S 100 RH Temperature conversion formula (result in °C): 16 T 2 S 175 45 T SRH and ST denote the raw sensor output (as decimal values) for humidity and temperature, respectively. |
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