DS2431 Maxim Integrated Products, DS2431 Datasheet - Page 23

• Manufacturer Part Number: DS2431
• Description: EEPROM
• Manufacturer: Maxim Integrated Products

READ MEMORY (INVALID ADDRESS)
MEMORY FUNCTION EXAMPLE
Write to the first 8 bytes of memory page 1. Read the entire memory.
With only a single DS2431 connected to the bus master, the communication looks like this:
RST
MASTER MODE
PD
RX
RX
RX
RX
RX
RX
RX
RX
RX
----
RX
RX
RX
RX
TX
TX
TX
TX
TX
TX
TX
TX
TX
TX
TX
TX
TX
TX
TX
TX
TX
TX
TX
TX
TX
Select
RM
TA
DATA (LSB FIRST)
<2 bytes CRC16\>
<2 bytes CRC16\>
<1-Wire idle high>
<144 data bytes>
<8 data bytes>
<8 data bytes>
FF loop
(Presence)
(Presence)
(Presence)
(Presence)
(Presence)
(Reset)
(Reset)
(Reset)
(Reset)
(Reset)
CCh
CCh
CCh
CCh
AAh
AAh
0Fh
20h
00h
20h
00h
07h
55h
20h
00h
07h
F0h
00h
00h
23 of 24
Reset pulse
Presence pulse
Issue “Skip ROM” command
Issue “Write scratchpad” command
TA1, beginning offset = 20h
TA2, address = 0020h
Write 8 bytes of data to scratchpad
Read CRC to check for data integrity
Reset pulse
Presence pulse
Issue “Skip ROM” command
Issue “Read scratchpad” command
Read TA1, beginning offset = 20h
Read TA2, address = 0020h
Read E/S, ending offset = 111b, AA, PF = 0
Read scratchpad data and verify
Read CRC to check for data integrity
Reset pulse
Presence pulse
Issue “Skip ROM” command
Issue “copy scratchpad” command
TA1
TA2
E/S
Wait t
complete
Read copy status, AAh = success
Reset pulse
Presence pulse
Issue “Skip ROM” command
Issue “Read Memory” command
TA1, beginning offset = 00h
TA2, address = 0000h
Read the entire memory
Reset pulse
Presence pulse
PROGmax
DS2431: 1024-Bit, 1-Wire EEPROM
for the copy function to
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