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HTU31D 데이터시트(PDF) 12 Page - TE Connectivity Ltd

부품명 HTU31D
상세설명  HTU31D RH/T SENSOR IC Digital Relative Humidity sensor with Temperature output
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제조업체  TEC [TE Connectivity Ltd]
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HTU31D 데이터시트(HTML) 12 Page - TE Connectivity Ltd

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HTU31D RH/T SENSOR IC
Digital Relative Humidity sensor with Temperature output
TE CONNECTIVITY SENSORS /// HTU31D RH/T SENSOR IC
05/2020
Page 12
Abbreviation
Description
NVM error
bit is set if the CRC of the NVM has failed (CRC is done on the register
copy)
Humidity under/overrun
bit is set if the humidity is truncated to 0 or the max value of 2^16-1
Humidity low error
bit is set if the humidity calculation results below -10 %RH
Humidity high error
bit is set if the humidity calculation results above 120 %RH
Temperature under/overrun
bit is set if the temperature is truncated to 0 or the max value of 2^16-1
Temperature low error
bit is set if the temperature calculation results below -50 °C
Temperature high error
bit is set if the temperature calculation results above 150 °C
Heater on
bit is set if the heater is on
Table 13 Diagnostic register bits
Read serial number
For identification of the chip, the serial number can be read. The 24 bit serial number data is followed by an 8 bit CRC:
Figure 11 Read Serial number command
CRC
CRC Checksum
HTU31D sensor provides a CRC-8 checksum for error detection. The polynomial used is X8 + X5 + X4 + 1.
Basic Considerations
CRC stands for Cyclic Redundancy Check. It is one of the most effective error detection schemes and requires a minimal
amount of resources.
The types of errors that are detectable with CRC that is implemented in HTU31D sensors are:
 Any odd number of errors anywhere within the data transmission
 All double-bit errors anywhere within the transmission
 Any cluster of errors that can be contained within an 8-bit window (1-8 bits incorrect)
 Most larger clusters of errors
A CRC is an error-detecting code commonly used in digital networks and storage devices to detect accidental changes to raw
data.
Blocks of data entering these systems get a short check value attached, based on the remainder of a polynomial division of
their contents; on retrieval the calculation is repeated, and corrective action can be taken against presumed data corruption if
the check values do not match.
1 0 0 0 0
0
0
0 0 0 0 0 0 1 0 1 0 0
1 0 0 0 0 0 0 1 0 x x x x x x x x 0 0 0 0 0 0 0 1 0 0 x x x x x x x x 0 0 0 0 0 0 0 1 0 0 x x x x x x x x 0 0 0 0 0 0 0 1 0 0 0
S
W A
A P S
R A
A
A
A
A
A
A A P
From Master
S = Start Condition
W = Write
A = Acknowledge
From Slave
P = Stop Condition
R = Read
N = Not Acknowledage
data
data
data
data
Device Address
cmd byte
Serial Number
CRC
Serial Number
CRC
Device Address
CRC
Serial Number
data
data
Device Address
command
Device Address


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