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HTU31D 데이터시트(PDF) 12 Page - TE Connectivity Ltd |
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HTU31D 데이터시트(HTML) 12 Page - TE Connectivity Ltd |
12 / 19 page 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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