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18B20 Datasheet(PDF) 18 Page - Dallas Semiconductor |
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18B20 Datasheet(HTML) 18 Page - Dallas Semiconductor |
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18 / 27 page  DS18B20 18 of 27 INITIALIZATION PROCEDURE “RESET AND PRESENCE PULSES” Figure 11 DS18B20 COMMAND SET Table 4 INSTRUCTION DESCRIPTION PROTOCOL 1-WIRE BUS AFTER ISSUING PROTOCOL NOTES TEMPERATURE CONVERSION COMMANDS Convert T Initiates temperature conversion. 44h <read temperature busy status> 1 MEMORY COMMANDS Read Scratchpad Reads bytes from scratchpad and reads CRC byte. BEh <read data up to 9 bytes> Write Scratchpad Writes bytes into scratchpad at addresses 2 through 4 (TH and TL temperature triggers and config). 4Eh <write data into 3 bytes at addr. 2 through. 4> 3 Copy Scratchpad Copies scratchpad into nonvolatile memory (addresses 2 through 4 only). 48h <read copy status> 2 Recall E 2 Recalls values stored in nonvolatile memory into scratchpad (temperature triggers). B8h <read temperature busy status> Read Power Supply Signals the mode of DS18B20 power supply to the master. B4h <read supply status> |
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