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DS2415V

1-Wire™ Time Chip

Dallas Semiconductor -> Maxim Integrated 

DS2415

The functions required to exercise the control functions of the DS2415 are not accessible until the ROM

function protocol has been satisfied. This protocol is described in the ROM functions flow chart

(Figure 7). The 1-Wire bus master must first provide one of the four ROM function commands. After a

ROM function sequence has been successfully executed, the bus master may then provide one of the

function commands specific to the DS2415 (Figure 5).

HIERARCHICAL STRUCTURE FOR 1-WIRE PROTOCOL Figure 2

64-BIT LASERED ROM Figure 3

MSB

LSB

8-Bit CRC Code

48-Bit Serial Number

8-Bit Family Code (24H)

MSB

LSB MSB

LSB MSB

LSB

1-WIRE CRC GENERATOR Figure 4

Polynomial = X8 + X5 + X4 + 1

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