Rainbow-electronics DS1920 Manual do Utilizador descarregar pdf (Página 11)

DS1920

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Read Scratchpad [BEh]

This command reads the complete scratchpad. After the last byte of the scratchpad is read, the bus master

will receive an 8-bit CRC of all scratchpad bytes. If not all locations are to be read, the master may issue

a reset to terminate reading at any time.

Copy Scratchpad [48h]

This command copies from the scratchpad into the EEPROM of the DS1920, storing the temperature

trigger bytes in nonvolatile memory. The bus master has to enable a strong pullup for at least 10 ms

immediately after issuing this command.

Convert Temperature [44h]

This command begins a temperature conversion. No further data is required. The bus master has to enable

a strong pullup for 0.5 seconds immediately after issuing this command.

Recall [B8h]

This command recalls the temperature trigger values stored in EEPROM to the scratchpad. This recall

operation happens automatically upon power-up to the DS1920 as well, so valid data is available in the

scratchpad as soon as the device has power applied.

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Rainbow-electronics DS1920 Manual do Utilizador Página 11