Datasheet
13Maxim Integrated
DS2465
DeepCover Secure Authenticator with
SHA-256 Coprocessor and 1-Wire Master Function
ABRIDGED DATA SHEET
Table 6. Conversion between parameter value code and typical parameter value
Factory Byte (70h)
This byte reads 55h.
Refer to the full data sheet for this information.
Personality Byte (73h)
This byte reads 00h.
Function Commands
The DS2465 understands
function commands. The feedback path to the host is controlled by a read pointer, which is
set automatically by each function command for the host to efficiently access relevant information. The host processor
sends these commands and applicable parameters as strings of one or two bytes using the I
2
C interface. The I
2
C pro-
tocol requires that each byte be acknowledged by the receiving party to confirm acceptance or not be acknowledged
to indicate an error condition (invalid code or parameter) or to end the communication. See the I
2
C Interface section for
details of the I
2
C protocol including acknowledge. The function commands are as follows:
Refer to the full data sheet for this information.
Note: The power-on default values are bold.
PARAMETER VALUE CODE
t
RSTL
VALUE IN µs
t
MSP
VALUE IN µs
t
W0L
VALUE IN µs
t
REC0
VALUE IN µs
R
WPU
VALUE IN ω
t
W1L
VALUE IN µs
STD OD STD OD STD OD STD, OD STD, OD OD
0000b 440 44 58 5.5 52 5.0 2.5 500 do not use
0001b 460 46 58 5.5 54 5.5 2.5 500 0.25
0010b 480 48 60 6.0 56 6.0 2.5 500 0.50
0011b 500 50 62 6.5 58 6.5 2.5 500 0.75
0100b 520 52 64 7.0 60 7.0 2.5 500
1.00
0101b 540 54 66 7.5 62 7.5 2.5 500 1.25
0110b
560 56 68 8.0 64 8.0 5.0 1000
1.50
0111b 580 58 70 8.5 66 8.5 7.5 1000 1.75
1000b 600 60 72 9.0 68 9.0 10.0 1000 2.00
1001b 620 62 74 9.5 70 9.5 12.5 1000 2.25
1010b 640 64 76 10.0
70 10 15.0 1000 2.50
1011b 660 66 76 10.5 70 10 17.5 1000 2.75
1100b 680 68 76 11.0 70 10 20.0 1000 3.00
1101b 700 70 76 11.0 70 10 22.5 1000 3.25
1110b 720 72 76 11.0 70 10 25.0 1000 3.50
1111b 740 74 76 11.0 70 10 25.0 1000 3.75