Datasheet

30Maxim Integrated
DS2465
DeepCover Secure Authenticator with
SHA-256 Coprocessor and 1-Wire Master Function
ABRIDGED DATA SHEET
1-Wire Read Byte
Command Code 96h
Parameter Byte N/A
Usage
To read data from the 1-Wire line. Equivalent to executing eight 1-Wire Single Bit
commands with V = 1 (write-one time slot), but faster due to less I
2
C traffic.
Other Notes
Generates eight read-data time slots on the 1-Wire line and stores result in the
1-Wire Read Data Register.
Command Restrictions 1-Wire activity must have ended before the DS2465 can process this command.
Error Conditions (Error Response)
Command code is not acknowledged if 1WB = 1 at the time the command code is
received and the command is ignored.
MAC Notes N/A
I
2
C Busy Duration None
Command Duration
8 x t
SLOT
+ maximum 1.09µs, counted from the rising SCL edge of the command
code acknowledge bit.
1-Wire Activity
Begins maximum 1.09µs after the rising SCL edge of the command code
acknowledge bit.
Read Pointer Position
1-Wire Master Status register (for busy polling). Note: To read the data byte
received from the 1-Wire line, issue a dummy write to memory address of the
1-Wire Read Data register. Then access the DS2465 in read mode.
Master Status Bits Affected 1WB (set to 1 for 8 x t
SLOT
).
Master Configurations Affected 1WS, APU, SPU apply.
1-Wire Port Configurations Affected t
REC0
, t
W1L
, and R
WPU
current values apply.