DS1977-F5- MAXIM [Maxim Integrated Products], DS1977-F5- Datasheet - Page 14

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

Figure 7-4. MEMORY/CONTROL FUNCTION FLOW CHART
From Figure 7
3
NOTE: The strong pullup
must be activated within
40µs after the last bit of the
password is transmitted.
Pullup duration: see t
To Figure 7
3
rd
rd
Part
Part
TA1 (T7:T0), TA2 (T15:T8)
Address = (T15:T3, 0, 0, 0)
SPUV
DS1977 sets Memory
Password to verify
Master Activates
Strong Pullup
Password?
Address of
Master TX
Master RX
TX Reset?
Password
Master TX
Password
AAh byte
Match?
Master
Y
Verify
C3h
Y
Y
Y
N
N
N
N
14 of 29
Master RX
TX Reset?
FFh byte
Master
Y
N
Version
Read
CCh
N
Master RX two copies
of Version Register
Y
two bytes 00h
Master TX