Datasheet

27Maxim Integrated
DS2465
DeepCover Secure Authenticator with
SHA-256 Coprocessor and 1-Wire Master Function
ABRIDGED DATA SHEET
Figure 5. 1-Wire Reset/Presence-Detect Cycle
1-Wire Single Bit
Command Code 87h
Parameter Byte Type of time slot (Table 21)
Usage
To perform single-bit writes or reads at the 1-Wire line when single bit
communication is necessary (the exception).
Other Notes
Generates a single 1-Wire time slot as specified by the parameter byte at the 1-Wire
line; reads the logic level at the 1-Wire line at t
MSR
and updates SBR accordingly.
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
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.
Read Pointer Position 1-Wire Master Status register (for busy polling and data reading).
Master Status Bits Affected 1WB (set to 1 for t
SLOT
), SBR is updated at t
MSR
, DIR (may change its state).
Master Configurations Affected 1WS, APU, SPU apply.
1-Wire Port Configurations Affected t
W0L
, t
W1L
, t
REC0
, and R
WPU
current values apply.
PULLUP DS2465 PULLDOWN 1-Wire SLAVE PULLDOWN
V
CC
V
IH1
V
IL1
0V
RESET PULSE PRESENCE/SHORT DETECT
t
RSTL
t
SI
t
MSP
t
RSTH
t
F
PRESENCE PULSE
APU CONTROLLED
EDGE