DS2431 Maxim, DS2431 Datasheet - Page 22

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DS2431

Manufacturer Part Number
DS2431
Description
The DS2431 is a 1024-bit, 1-Wire® EEPROM chip organized as four memory pages of 256 bits each
Manufacturer
Maxim
Datasheet

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1024-Bit, 1-Wire EEPROM
Write to the first 8 bytes of memory page 1. Read the
entire memory.
22
MASTER MODE
______________________________________________________________________________________
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
Memory Function Example
DATA (LSB FIRST)
<2 Bytes CRC-16>
<2 Bytes CRC-16>
<1-Wire Idle High>
<144 Data Bytes>
<8 Data Bytes>
<8 Data Bytes>
(Presence)
(Presence)
(Presence)
(Presence)
(Presence)
(Reset)
(Reset)
(Reset)
(Reset)
(Reset)
CCh
CCh
AAh
CCh
AAh
CCh
0Fh
20h
00h
20h
00h
07h
55h
20h
00h
07h
F0h
00h
00h
With only a single DS2431 connected to the bus mas-
ter, the communication looks like this:
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
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
(AUTHORIZATION CODE)
for the copy function to complete
COMMENTS

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