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DS1920 Datasheet(PDF) 19 Page - Dallas Semiconductor |
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DS1920 Datasheet(HTML) 19 Page - Dallas Semiconductor |
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19 / 22 page  DS1920 19 of 22 MEMORY FUNCTION EXAMPLE Table 3 Example: Bus Master initiates temperature conversion, then reads temperature. MASTER MODE DATA (LSB FIRST) COMMENTS TX Reset Reset pulse( 480-960 µs) RX Presence Presence pulse TX 55H Issue "Match ROM" command TX <64-bit ROM code> Issue address for DS1920 TX 44H Issue "Convert Temperature" command TX <DATA LINE HIGH> Data line is held high for at least 0.5 seconds by bus master to allow conversion to complete. TX Reset Reset pulse RX Presence Presence pulse TX 55H Issue "Match ROM" command TX <64-bit ROM code> Issue address for DS1920 TX BEH Issue "Read Scratchpad" command. RX <9 data bytes> Read entire scratchpad plus CRC; the master now recalculates the CRC of the eight data bytes received from the scratchpad, compares the CRC calculated and the CRC read. If they match, the master continues; if not, this read operation is repeated. TX Reset Reset pulse RX Presence Presence pulse, done. |
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