DS2415 Dallas Semiconducotr, DS2415 Datasheet - Page 3

• Manufacturer Part Number: DS2415
• Description: 1-Wire Time Chip
• Manufacturer: Dallas Semiconducotr

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
1-WIRE CRC GENERATOR Figure 4
Polynomial = X
MSB
MSB
8-Bit CRC Code
8
+ X
5
+ X
4
+ 1
LSB MSB
48-Bit Serial Number
3 of 14
LSB MSB
8-Bit Family Code (24H)
DS2415
LSB
LSB