DS28E04-100 Maxim, DS28E04-100 Datasheet - Page 34

• Manufacturer Part Number: DS28E04-100
• Description: The DS28E04-100 is a 4096-bit, 1-Wire® EEPROM chip with seven address inputs
• Manufacturer: Maxim

MEMORY FUNCTION EXAMPLE
Write 5 bytes to memory page 1, starting at address 0021h. Read the entire memory and the PIO-related registers.
With only a single DS28E04-100 connected to the bus master, the communication looks like this:
MASTER MODE
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
DATA (LSB FIRST)
<2 bytes CRC16\>
<1-Wire idle high>
<550 data bytes>
<5 data bytes>
<5 data bytes>
(Presence)
(Presence)
(Presence)
(Presence)
(Presence)
(Reset)
(Reset)
(Reset)
(Reset)
(Reset)
CCh
CCh
CCh
CCh
AAh
AAh
0Fh
21h
00h
21h
00h
05h
55h
21h
00h
05h
F0h
00h
00h
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Reset pulse
Presence pulse
Issue “Skip ROM” command
Issue “Write Scratchpad” command
TA1, beginning offset = 21h
TA2, address = 0021h
Write 5 bytes of data to scratchpad
Reset pulse
Presence pulse
Issue “Skip ROM” command
Issue “Read Scratchpad” command
Read TA1, beginning offset = 21h
Read TA2, address = 0021h
Read E/S, ending offset = 00101b, 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 10ms for the copy function to 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
(AUTHORIZATION CODE)
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