1024-Bit EEPROM iButton

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21

Command-Specific 1-Wire Communication Protocol—Color Codes

1-Wire Communication Examples

Master to Slave

Slave to Master

Programming

Write Scratchpad (Cannot Fail)

RST PD Select WS TA <8–T[2:0] bytes>

CRC-16 FF Loop

Read Scratchpad (Cannot Fail)

RST PD Select RS TA-E/S <8–T[2:0] bytes>

CRC-16 FF Loop

Copy Scratchpad (Success)

RST PD Select CPS TA-E/S Programming AA Loop

Copy Scratchpad (Invalid Address or PF = 1 or Copy Protected)

RST PD Select CPS TA-E/S FF Loop

Read Memory (Success)

RST PD Select RM

TA <Data to EOM> FF Loop

Read Memory (Invalid Address)

RST PD Select RM

TA FF Loop