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SHTW2 Datasheet(PDF) 7 Page - List of Unclassifed Manufacturers

Part # SHTW2
Description  Ultra-small flip chip package: 1.30.70.5 mm3
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Manufacturer  ETC2 [List of Unclassifed Manufacturers]
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SHTW2 Datasheet(HTML) 7 Page - List of Unclassifed Manufacturers

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Version 2 – August 2016
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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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