Datasheet

29Maxim Integrated
DS2465
DeepCover Secure Authenticator with
SHA-256 Coprocessor and 1-Wire Master Function
ABRIDGED DATA SHEET
Bit 7:0: Data Byte (DATA). These bits specify the data to be written to the 1-Wire line. The time slot for bit 0 is gener-
ated first.
Table 22. Parameter Byte Bitmap
1-Wire Write Byte
Command Code A5h
Parameter Byte Data byte (Table 22)
Usage
To write commands or data to the 1-Wire line. Equivalent to executing eight 1-Wire
Single Bit commands, but faster due to less I
2
C traffic.
Other Notes Writes a single data byte to the 1-Wire line.
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 O t
SLOT
+ maximum 1.09µs, counted from the rising SCL edge of the parameter
byte acknowledge bit.
1-Wire Activity
Begins maximum 1.09µs after the rising SCL edge of the parameter byte
acknowledge bit. Note: The bit order on the I
2
C bus and the 1-Wire line is different
(1-Wire: LSB first; I
2
C: MSB first). Therefore, 1-Wire activity cannot begin before the
DS2465 has received the full data byte.
Read Pointer Position 1-Wire Master Status register (for busy polling).
Master Status Bits Affected
1WB (set to 1 for 8 O t
SLOT
).
Master Configurations Affected 1WS, APU, SPU apply.
1-Wire Port Configurations Affected t
W0L
, t
W1L
, t
REC0
, and R
WPU
current values apply.
BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0
DATA