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Part Name
Description
DS1992 View Datasheet(PDF) - Maxim Integrated
Part Name
Description
Manufacturer
DS1992
1Kb/4Kb Memory iButton
Maxim Integrated
DS1992 Datasheet PDF : 17 Pages
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Figure 1. DS1992/DS1993 BLOCK DIAGRAM
1-WIRE
PORT
1-W
ROM
FUNCTION
CONTROL
64-BIT
LASERED
ROM
PARASITE-
POWERED
CIRCUITRY
DS1992/DS1993
MEMORY
FUNCTION
CONTROL
256-BIT
SCRATCHPAD
3V LITHIUM
SRAM
16 PAGES of 256-
BITs (1993)
4 PAGES of 256-
BITs (1992)
Figure 2. 64-BIT LASERED ROM
MSB
8-Bit CRC Code
48-Bit Serial Number
MSB
LSB MSB
LSB
8-Bit Family Code
(06h)1993
(08h)1992
LSB MSB
LSB
Figure 3. 1-Wire CRC CODE
Polynomial = X
8
+ X
5
+ X
4
+ 1
1
st
2
nd
3
rd
4
th
STAGE STAGE STAGE STAGE
X
0
X
1
X
2
X
3
5
th
STAGE
X
4
6
th
7
th
8
th
STAGE STAGE STAGE
X
5
X
6
X
7
X
8
INPUT DATA
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