DS1904 View Datasheet(PDF) - Maxim Integrated
Part Name
Description
Manufacturer
DS1904 Datasheet PDF : 13 Pages
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HIERARCHICAL STRUCTURE FOR 1-WIRE PROTOCOL Figure 2
Bus
Master
1-Wire Bus
Other
Devices
DS1904
Command
Level
1-Wire ROM Function
Commands (see Figure 7)
DS1904
Available
Commands
Read ROM
Match ROM
Search ROM
Skip ROM
Data Fields
Affected
64-bit ROM
64-bit ROM
64-bit ROM
N/A
DS1904 specific
Function Commands
(see Figure 5)
Write Clock
Read Clock
RTC Counter, Device Control
RTC Counter, Device Control
64-BIT LASERED ROM Figure 3
MSB
LSB
8-Bit CRC Code
MSB
LSB MSB
48-Bit Serial Number
8-Bit Family Code (24h)
LSB MSB
LSB
1-WIRE CRC GENERATOR Figure 4
Polynomial = X8 + X5 + X4 + 1
R
S
1ST
2ND
3RD
4TH
STAGE STAGE STAGE STAGE
X0
X1
X2
X3
5TH
STAGE
X4
6TH
7TH
8TH
STAGE STAGE STAGE
X5
X6
X7
X8
INPUT DATA
3 of 13
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