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DS9101 Datasheet(PDF) 3 Page - Dallas Semiconductor

Part # DS9101
Description  RTC iButton
PDF  12 Pages
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Manufacturer  DALLAS [Dallas Semiconductor]
Direct Link  https://www.maximintegrated.com/en.html
Logo DALLAS - Dallas Semiconductor

DS9101 Datasheet(HTML) 3 Page - Dallas Semiconductor

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DS1904
3 of 12
HIERARCHICAL STRUCTURE FOR 1-WIRE PROTOCOL Figure 2
DS1904
Command
Level
Available
Commands
Data Fields
Affected
1-Wire Bus
Other
Devices
Bus
Master
DS1904
Function
(see Figure
Write
Read
RTC Counter, Device
RTC Counter, Device
Read
Match
Search
Skip
64-bit
64-bit
64-bit
N/A
1-Wire ROM
Commands (see Figure
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
R
X2
X1
X0
X8
X7
X6
X5
X4
X3
8TH
STAGE
7TH
STAGE
6TH
STAGE
5TH
STAGE
4TH
STAGE
3RD
STAGE
2ND
STAGE
1ST
STAGE
S
INPUT DATA
Polynomial = X8 + X5 + X4 + 1



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