DS1977-F5- MAXIM [Maxim Integrated Products], DS1977-F5- Datasheet - Page 24

• Manufacturer Part Number: DS1977-F5-
• Description: Password-Protected 32KB EEPROM iButton
• Manufacturer: MAXIM [Maxim Integrated Products]

COMMAND-SPECIFIC 1-WIRE COMMUNICATION PROTOCOL—COLOR
CODES
WRITE SCRATCHPAD, REACHING THE END OF THE SCRATCHPAD (CANNOT FAIL)
WRITE SCRATCHPAD, NOT REACHING THE END OF THE SCRATCHPAD (CANNOT FAIL)
READ SCRATCHPAD (CANNOT FAIL)
COPY SCRATCHPAD WITH PASSWORD (SUCCESS)
COPY SCRATCHPAD WITH PASSWORD (FAIL TA-E/S OR PASSWORD)
READ MEMORY WITH PASSWORD (SUCCESS)
READ MEMORY WITH PASSWORD (FAIL PASSWORD)
Master to slave
RST
RST
RST
RST
RST
RST
RST
PD
PD
PD
PD
PD
PD
PD
Select
Select
Select
Select
Select
Select
Select
Slave to master
WS
WS
RS
CPS
CPS
RM
RM
TA-E/S
TA
TA
TA
TA
TA-E/S
TA-E/S
Strong Pullup
<PW/dummy>
<PW/dummy>
<data to EOS>
<data>
<data to EOS>
<PW/dummy>
<PW/dummy>
Strong Pullup
RST
24 of 29
Strong Pullup
Strong Pullup
CRC16\
PD
CRC16\
Strong Pullup
Strong Pullup
<64 bytes>
FF loop
FF loop
FF loop
<data to EOP>
AA loop
FF loop
CRC16\
FF loop
CRC16\
Loop