Datasheet

28Maxim Integrated
DS2465
DeepCover Secure Authenticator with
SHA-256 Coprocessor and 1-Wire Master Function
ABRIDGED DATA SHEET
Bit 7: Bit value (V). This bit specifies the type of time slot to be generated. If V = 0, a write-zero time slot (Figure 6) is
generated. If V = 1, a write-one time slot (Figure 7) is generated, which also functions as a read-data time slot.
Table 21. Parameter Byte Bitmap
X = Don’t care
Figure 6. Write-Zero Time Slot
Figure 7. Write-One and Read-Data Time Slot
BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0
V X X X X X X X
PULLUP (SEE RISING EDGE PULLUP) DS2465 PULLDOWN
V
C1W
V
IH1
V
IL1
0V
t
SLOT
t
R
EC0
t
WOL
t
MSR
t
F
PULLUP DS2465 PULLDOWN 1-Wire SLAVE PULLDOWN
V
CC
V
IH1
V
IL1
0V
t
SLOT
t
W1L
t
MSR
t
F
NOTE: DEPENDING ON ITS INTERNAL STATE, A 1-Wire SLAVE DEVICE TRANSMITS DATA TO ITS MASTER (e.g., THE DS2465). WHEN RESPONDING WITH A 0,
A 1-Wire SLAVE STARTS PULLING THE LINE LOW DURING t
W1L
. ITS INTERNAL TIMING GENERATOR DETERMINES WHEN THIS PULLDOWN ENDS AND THE VOLTAGE
STARTS RISING AGAIN. WHEN RESPONDING WITH A 1, A 1-Wire SLAVE DOES NOT HOLD THE LINE LOW AT ALL, AND THE VOLTAGE STARTS RISING AS SOON AS t
W1L
IS OVER. 1-Wire DEVICE DATA SHEETS USE THE TERM t
RL
INSTEAD OF t
W1L
TO DESCRIBE A READ-DATA TIME SLOT. TECHNICALLY, t
RL
AND t
W1L
HAVE IDENTICAL
SPECIFICATIONS AND CANNOT BE DISTINGUISHED FROM EACH OTHER.