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STS30 bảng dữ liệu(PDF) 10 Page - List of Unclassifed Manufacturers

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Giải thích chi tiết về linh kiện  Fully calibrated and linearized digital output
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nhà sản xuất  ETC2 [List of Unclassifed Manufacturers]
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STS30 bảng dữ liệu(HTML) 10 Page - List of Unclassifed Manufacturers

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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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