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DS1075 Datasheet(PDF) 12 Page - Dallas Semiconductor |
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DS1075 Datasheet(HTML) 12 Page - Dallas Semiconductor |
12 / 18 page DS1075 12 of 18 TRANSACTION SEQUENCE The sequence for accessing the DS1075 via the 1-Wire port is as follows: Initialization Function Command Transaction/Data INITIALIZATION All transactions on the 1-Wire bus begin with an initialization sequence. The initialization sequence consists of a reset pulse transmitted by the bus master followed by a presence pulse(s) transmitted by the DS1075. The presence pulse lets the bus master know that the DS1075 is present and is ready to operate. Figure 13 FUNCTION COMMANDS Once the bus master has detected a presence, it can issue one of the four function commands. All Function Commands are eight bits long, and are written lsb first. A list of these commands follows: Write DIV Register [01H] This command allows the bus master to write to the DS1075’s DIV register. Read DIV Register [A1H] This command allows the bus master to read the DS1075’s DIV register. Write MUX Register [02H] This command allows the bus master to write to the DS1075’s MUX register. Read MUX Register [A2H] This command allows the bus master to read the DS1075’s MUX register. TRANSACTION/DATA Immediately following the Function Command, the nine data bits are written to or read from the DS1075. This data is written/read lsb first. The following diagrams illustrate the timing. Once data transfer is complete a new transaction sequence can be started by re-initializing the device. Therefore to program both the DIV and MUX registers two complete transaction sequences are required. |
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