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DS1992 Datasheet(PDF) 8 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) 8 Page - Dallas Semiconductor

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DS1992/DS1993
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Figure 6. MEMORY FUNCTIONS FLOW CHART (Continued)
Y
N
Bus Master TX
TA1 (T7:T0)
Bus Master TX
TA2 (T15:T8)
Scratchpad
55H
Copy
?
N
Y
From Figure 6
First Part
Bus Master TX
E/S Byte
DS199X Copies
Scratchpad Data
To Memory
Auth-
Code Match
?
DS199X TX "1"s
DS199X TX "0"s
AA = 1
F0H
Read Memory
?
N
To Figure 6
First Part
Y
N
Bus Master
TX Reset
?
Bus Master
TX Reset
?
Y
N
Y
Y
Bus Master TX
TA1 (T7:T0)
Bus Master TX
TA2 (T15:T8)
DS199X sets Memory
Address = (T15:T0)
N
Y
N
Master RX Data
Byte From
Memory Address
Bus Master
TX Reset
?
Memory
DS199X
Address Counter
Increments
Bus Master
RX "1"s
Address
= 21Dh ?
rization



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