Datasheet

37Maxim Integrated
DS2465
DeepCover Secure Authenticator with
SHA-256 Coprocessor and 1-Wire Master Function
ABRIDGED DATA SHEET
Type 3 Behavior
This behavior applies to the
1-Wire Master Status register. Write mode access
is used to set the address for a subsequent read access
(dummy write); data bytes are not acknowledged. When
accessed in read mode, the address does not increment.
Type 4 Behavior
This behavior is similar to type 1, but data bytes are
discarded. It applies to EEPROM locations and some
read-only addresses. Write mode access is used to
set the address for a subsequent read access (dummy
write); the address increments after a data byte has
been acknowledged. When accessed in read mode, the
address increments after a byte is transmitted.
I
2
C Communication Examples
See Table 26 and Table 27 for the I
2
C communication
legend and data direction codes.
Table 26. I
2
C Communication—Legend
Table 27. Data Direction Codes
SYMBOL DESCRIPTION
S START Condition
AD, 0 Select DS2465 for Write Access
AD, 1 Select DS2465 for Read Access
Sr Repeated START Condition
P STOP Condition
A Acknowledged
A\ Not Acknowledged
(Idle) Bus Not Busy
<byte> Transfer of One Byte
CPS Command “Copy Scratchpad”, 5Ah
Refer to the full data sheet.
1WMR Command “1-Wire Master Reset”, F0h
1WRS Command “1-Wire Reset Pulse”, B4h
1WSB Command “1-Wire Single Bit”, 87h
1WWB Command “1-Wire Write Byte”, A5h
1WRB Command “1-Wire Read Byte”, 96h
1WT Command “1-Wire Triplet”, 78h
Refer to the full data sheet.
1WRB Command “1-Wire Receive Block”, E1h
Master-to-Slave Slave-to-Master (DS2465 busy)