DS80C400 Datasheet, PDF (23/97 Pages) Dallas Semiconductor – DS80C400 Network Microcontroller

DS80C400 Network Microcontroller
OWSTP PIN TIMING CHARACTERISTICS (Note 1)
(V_CC3 = 3.0V to 3.6V, V_CC1 = 1.8V ±10%, T_A = -40°C to +85°C.)
PARAMETER
SYMBOL
Active Time for Presence Detect
Active Time for Presence Detect Recovery
Active Time for Write 1 Recovery (Notes 2, 3)
Active Time for Write 0 Recovery (Notes 2, 3)
Delay Time for Presence Detect
Delay Time for Presence Detect Recovery (Note 4)
Delay Time for Write 1/Write 0 Recovery
Turn-Off Time for 1-Wire Reset
Turn-Off Time for Write 1/Write 0 (Note 5)
tON1
tON2
tON3
tON4
tDLY1
tDLY2
tDLY3
tOFF1
tOFF2
STANDARD
MIN
MAX
6.4
8
8
10
51.2
64
6.4
8
0.8
1
399.2
499
0.8
1
1.6
2
0.8
1
OVERDRIVE
MIN
MAX
0.8
1
8
10
7.2
9
0.8
1
0.8
1
31.2
39
0.8
1
1.6
2
0.8
1
UNITS
ms
ms
ms
ms
ms
ms
ms
ms
ms
Note 1: Specifications to -40°C are guaranteed by design and not production tested.
Note 2: There is no OWSTP timing difference for sending out and receiving bits within a byte. The difference comes when the last bit of the byte
has been completely sent. At this point, the signal is either enabled continuously until the next reset or time slot begins, or enabled only
for active time write 1 or write 0.
Note 3: When performing a read versus a write time slot, the master provides the same active time for write 1 and write 0. However, the
Schmitt-triggered input from the OW line is sensed every 1ms for a high value. If OW is high, the OWSTP signal is enabled. If the OW
line is low, the OWSTP signal remains disabled until a high state is sensed. In all write time slots, a high is sensed immediately.
Note 4: This parameter is the time delay until the master begins to monitor the OW pin level. If the line is already high, then OWSTP is enabled.
If not, it waits to enable OWSTP until the next state machine clock (1ms or 50ns) after the OW line recovers.
Note 5: The very first bit in a byte has an extended turn-off time of 4ms because of the order of states that the 1-Wire master state machine
must go through.
OWSTP PIN TIMING
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