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DS1992 Datasheet(PDF) 13 Page - Dallas Semiconductor

Part # DS1992
Description  1kbit/4kbit Memory iButtonTM DS1994 4-kbit Plus Time Memory iButtonTM
PDF  17 Pages
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Manufacturer  DALLAS [Dallas Semiconductor]
Direct Link  https://www.maximintegrated.com/en.html
Logo DALLAS - Dallas Semiconductor

DS1992 Datasheet(HTML) 13 Page - Dallas Semiconductor

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DS1992/DS1993
13of 13
Figure 9. ROM FUNCTIONS FLOW CHART
F0H
Search R O M
C ommand
?
CCH
Skip R O M
C ommand
?
D S 199X T X B it 0
D S 199X T X B it 0
M aster T X B it 0
Bit 0
Match ?
D S 199X T X B it 1
D S 199X T X B it 1
M aster T X B it 1
Bit 1
Match ?
D S 199X T X B it 63
D S 199X T X B it 63
M aster TX B it 63
Bit 63
Match ?
Master T X Mem ory
F unction C om m and
33H
Read RO M
C om m and
?
D S 199X T X
S erial N um ber
6 B ytes
D S 199X T X
CRC Byte
D S 199X T X
Fam ily C ode
1 B yte
Match R O M
55H
C ommand
?
Bit 0
Match ?
Bit 1
Match ?
Bit 63
Match ?
M aster T X B it 1
M aster T X B it 0
N
Y
N
Y
NN
Y
N
N
N
N
Y
Y
Y
Y
Y
Y
N
Y
N
Master T X R O M
F unction C om m and
Master T X
Res et Pulse
D S 199X T X
P resence P ulse
M aster T X B it 63



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