DS2431 Maxim, DS2431 Datasheet - Page 22
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
1.DS2431.pdf
(27 pages)
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
DS2431
Manufacturer:
DALLAS
Quantity:
20 000
Company:
Part Number:
DS2431+
Manufacturer:
LT
Quantity:
12 200
Company:
Part Number:
DS2431+
Manufacturer:
Maxim
Quantity:
35 020
Part Number:
DS2431+
Manufacturer:
DALLAS
Quantity:
20 000
Part Number:
DS2431+T&R
Manufacturer:
MAXIM/美信
Quantity:
20 000
Part Number:
DS2431A
Manufacturer:
MAXIM/美信
Quantity:
20 000
Part Number:
DS2431G+T
Manufacturer:
MAXIM/美信
Quantity:
20 000
Company:
Part Number:
DS2431G+U
Manufacturer:
MAXIM
Quantity:
2 000
Company:
Part Number:
DS2431GB+T
Manufacturer:
MAXIM
Quantity:
3 000
Company:
Part Number:
DS2431P+
Manufacturer:
MAXIM
Quantity:
7 692
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