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DS1994L-F5+ Datasheet(PDF) 10 Page - Maxim Integrated Products

Part # DS1994L-F5+
Description  4Kb Plus Time Memory iButton®
Download  23 Pages
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Manufacturer  MAXIM [Maxim Integrated Products]
Direct Link  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

DS1994L-F5+ Datasheet(HTML) 10 Page - Maxim Integrated Products

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DS1994
Figure 6. MEMORY FUNCTIONS FLOWCHART
10 of 23
Master TX Memory
Function Command
Y
DS1994 sets Scratchpad
Offset = (T4:T0) and
Clears (PF, OF, AA)
DS1994 sets (E4:E0)
= Scratchpad Offset
DS1994 Increments
Scratchpad Offset
Bus Master TX
TA1 (T7:T0)
Bus Master TX
TA2 (T15:T8)
Master TX Data Byte
To Scratchpad Offset
Bus Master
TX Reset
?
N
0FH
Write
?
Scratchpad
N
Bus Master
TX Data
?
Y
N
PF = 1
N
Y
Bus Master
TX Reset
?
To Figure 6
Second Part
Bus Master RX
TA1 (T7:T0)
Bus Master RX
TA2 (T15:T8)
Master RX Ending
Offset with Data
Status (E/S)
DS1994 Sets
Scratchpad
Offset = (T4:T0)
Bus Master
TX Reset
?
DS1994 Increments
Scratchpad Offset
Y
Master RX Data
Byte From
Scratchpad Offset
N
N
Scratch-
pad Offset =
11111b ?
Y
Y
A
Scratchpad
AH
Read
?
Scratch-
pad Offset =
11111b ?
N
Partial
Byte Written
?
N
Y
Y
Y
Bus Master
RX "1"s
OF = 1
From Figure 6
Second Part
DS1994 TX
Presence Pulse
(See Figure 9)


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