DS1996 Maxim, DS1996 Datasheet - Page 8

• Manufacturer Part Number: DS1996
• Description: The DS1996 Memory iButton is a rugged read/write data carrier that acts as a localized database that can be easily accessed with minimal hardware
• Manufacturer: Maxim

MEMORY FUNCTION EXAMPLES
Example: Write two data bytes to memory locations 0026h and 0027h (the seventh and 8th bytes of page
1). Read entire memory.
MASTER MODE
TX
RX
TX
TX
TX
TX
TX
TX
RX
TX
TX
RX
RX
RX
RX
TX
RX
TX
TX
TX
TX
TX
TX
RX
TX
TX
TX
TX
RX
TX
RX
DATA (LSB FIRST)
<2 data bytes>
<2 data bytes>
<8192 bytes>
Presence
Presence
Presence
Presence
Presence
Reset
Reset
Reset
Reset
Reset
AAh
CCh
CCh
CCh
CCh
0Fh
26h
00h
26h
00h
07h
55h
26h
00h
07h
F0h
00h
00h
8 of 19
COMMENTS
Reset pulse (480-960 µs)
Presence pulse
Issue “skip ROM” command
Issue “write scratchpad” command
TA1, beginning offset=6
TA2, address=0026h
Write 2 bytes of data to scratchpad
Reset pulse
Presence pulse
Issue “skip ROM” command
Issue “read scratchpad” command
Read TA1, beginning offset=6
Read TA2, address=0026h
Read E/S, ending offset=7, flags=0
Read scratchpad data and verify
Reset pulse
Presence pulse
Issue “skip ROM” command
Issue “copy scratchpad” command
TA1
TA2
E/S
Reset pulse
Presence pulse
Issue “skip ROM” command
Issue “read memory” command
TA1, beginning offset=0
TA2, address=0000h
Read entire memory
Reset pulse
Presence pulse, done
AUTHORIZATION CODE
DS1996