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Número de pieza
componentes Descripción
DS1994 Ver la hoja de datos (PDF) - Dallas Semiconductor -> Maxim Integrated
Número de pieza
componentes Descripción
Fabricante
DS1994
4kb Plus Time Memory iButton
Dallas Semiconductor -> Maxim Integrated
DS1994 Datasheet PDF : 22 Pages
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Figure 6. MEMORY FUNCTIONS FLOWCHART
DS1994
Master TX Memory
Function Command
0FH
Write
N
Scratchpad
?
Y
Bus Master TX
TA1 (T7:T0)
AAH
Read
Scratchpad
?
Y
Bus Master RX
TA1 (T7:T0)
To Figure 6
Second Part
Bus Master TX
TA2 (T15:T8)
Bus Master RX
TA2 (T15:T8)
DS1994 sets Scratchpad
Offset = (T4:T0) and
Clears (PF, OF, AA)
Master TX Data Byte
To Scratchpad Offset
Master RX Ending
Offset with Data
Status (E/S)
DS1994 Sets
Scratchpad
Offset = (T4:T0)
DS1994 sets (E4:E0)
= Scratchpad Offset
Master RX Data
Byte From
Scratchpad Offset
Bus Master
Y
DS1994 Increments
Scratchpad Offset
N
TX Reset
?
N
Scratch-
pad Offset =
Bus Master
Y
TX Reset
DS1994 Increments
Scratchpad Offset
?
N
11111b ?
Y
Partial
Y
Byte Written
?
N
Scratch-
pad Offset =
11111b ?
Y
Y
Bus Master
TX Data
N
PF = 1
Bus Master
RX "1"s
OF = 1
?N
N
Bus Master
TX Reset
?
Y
DS1994 TX
Presence Pulse
(See Figure 9)
From Figure 6
Second Part
10 of 22
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