Datasheet
26Maxim Integrated
DS2465
DeepCover Secure Authenticator with
SHA-256 Coprocessor and 1-Wire Master Function
ABRIDGED DATA SHEET
1-Wire Master Reset
Command Code F0h
Parameter Byte N/A
Usage Device initialization after power-up; re-initialization (reset) as desired.
Other Notes
Performs a global reset of device state machine logic. Terminates any ongoing 1-Wire
communication.
Command Restrictions The command must be followed by a 1-Wire Reset Pulse command.
Error Conditions (Error Response) None
MAC Notes N/A
I
2
C Busy Duration None
Command Duration
Maximum 1.635µs. Counted from rising SCL edge of the command code acknowledge
bit.
1-Wire Activity
Ends maximum 1.09µs after the rising SCL edge of the command code acknowledge
bit.
Read Pointer Position (N/A)
Master Status Bits Affected RST set to 1; 1WB, PPD, SD, SBR, TSB, DIR set to 0.
Master Configurations Affected 1WS, APU, PDN, SPU set to 0.
1-Wire Port Configurations Affected t
RSTL
, t
MSP
, t
W0L
, t
W1L
, t
REC0
, and R
WPU
are reset to their default values.
1-Wire Reset Pulse
Command Code B4h
Parameter Byte N/A
Usage
To initiate or end any 1-Wire communication sequence. To finish a 1-Wire Master
Reset command.
Other Notes
Generates a 1-Wire reset/presence-detect cycle (Figure 5) at the 1-Wire line. The
state of the 1-Wire line is sampled at t
SI
and t
MSP
and the result is reported to the host
processor through the 1-Wire Master Status Register, bits PPD and SD.
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
2 O t
RSTL
+ 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).
Master Status Bits Affected
1WB (set to 1 for 2 O t
RSTL
), PPD is updated at t
RSTL
+ t
MSP
, SD is updated at t
RSTL
+ t
SI
.
Master Configurations Affected 1WS and APU apply.
1-Wire Port Configurations Affected t
RSTL
, t
MSP
, and R
WPU
current values apply.