Datasheet

DS2430A
15 of 19
MEMORY FUNCTION EXAMPLE
Example: Write 2 data bytes to data memory locations 0006h and 0007h. Read entire data memory.
MASTER MODE
DATA (LSB FIRST)
COMMENTS
TX
Reset
Reset pulse (480µs to 960µs)
RX
Presence
Presence pulse
TX
CCh
Issue “Skip ROM” command
TX
0Fh
Issue “Write Scratchpad” command
TX
06h
Start address = 06h
TX
<2 Data Bytes>
Write 2 bytes of data to scratchpad
TX
Reset
Reset pulse
RX
Presence
Presence pulse
TX
CCh
Issue “Skip ROM” command
TX
AAh
Issue “Read Scratchpad” command
TX
06h
Start address = 06h
RX
<2 Data Bytes>
Read scratchpad data and verify
TX
Reset
Reset pulse
RX
Presence
Presence pulse
TX
CCh
Issue “Skip ROM” command
TX
55h
Issue “Copy Scratchpad” command
TX
A5h
Validation key
TX
<Data Line High>
Data line must be above V
PUPmin
for t
PROG
.
TX
Reset
Reset pulse
RX
Presence
Presence pulse
TX
CCh
Issue “Skip ROM” command
TX
F0h
Issue “Read Memory” command
TX
00h
Start address = 00h
RX
<32 Bytes>
Read EEPROM data page
TX
Reset
Reset pulse
RX
Presence
Presence pulse
NOT RECOMMENDED FOR NEW DESIGNS