DS1972-F3 MAXIM [Maxim Integrated Products], DS1972-F3 Datasheet - Page 22

• Manufacturer Part Number: DS1972-F3
• Description: 1024-Bit EEPROM iButton
• Manufacturer: MAXIM [Maxim Integrated Products]

COMMAND-SPECIFIC 1-Wire COMMUNICATION PROTOCOL—LEGEND
WRITE SCRATCHPAD (CANNOT FAIL)
READ SCRATCHPAD (CANNOT FAIL)
COPY SCRATCHPAD (SUCCESS)
COPY SCRATCHPAD (INVALID ADDRESS OR PF = 1 OR COPY PROTECTED)
READ MEMORY (SUCCESS)
READ MEMORY (INVALID ADDRESS)
RST
RST
RST
RST
RST
RST
<8 – T2:T0 bytes>
<data to EOM>
Programming
SYMBOL
CRC16\
AA loop
FF loop
TA-E/S
Select
CPS
PD
PD
PD
PD
PD
PD
RST
WS
RM
PD
RS
TA
Select
Select
Select
Select
Select
Select
1-Wire Reset Pulse generated by master.
1-Wire Presence Pulse generated by slave.
Command and data to satisfy the ROM function protocol.
Command "Write Scratchpad".
Command "Read Scratchpad".
Command "Copy Scratchpad".
Command "Read Memory".
Target Address TA1, TA2.
Target Address TA1, TA2 with E/S byte.
Transfer of as many bytes as needed to reach the end of the scratchpad for a given
target address.
Transfer of as many data bytes as are needed to reach the end of the memory.
Transfer of an inverted CRC16.
Indefinite loop where the master reads FF bytes.
Indefinite loop where the master reads AA bytes.
Data transfer to EEPROM; no activity on the 1-Wire bus permitted during this time.
WS
RS
CPS
CPS
RM
RM
TA
TA-E/S
TA-E/S
TA-E/S
TA
TA
<8 – T2:T0 bytes>
<data to EOM>
FF loop
<8 – T2:T0 bytes>
Programming
FF loop
22 of 23
FF loop
DESCRIPTION
CRC16\
AA loop
CRC16\
FF loop
FF loop