DS80C410 Datasheet, PDF (25/102 Pages) Dallas Semiconductor – Network Microcontrollers with Ethernet and CAN

DS80C410/DS80C411 Network Microcontrollers with Ethernet and CAN
OWSTP PIN TIMING CHARACTERISTICS
(V_CC3 = 3.0V to 3.6V, V_CC1 = 1.8V ±10%, T_A = -40∞C to +85∞C.) (Note 1)
PARAMETER
SYMBOL
STANDARD
MIN
MAX
Active Time for Presence Detect
tON1
6.4
8
Active Time for Presence Detect Recovery
tON2
8
10
Active Time for Write 1 Recovery (Notes 2, 3)
tON3
51.2
64
Active Time for Write 0 Recovery (Notes 2, 3)
tON4
6.4
8
Delay Time for Presence Detect
tDLY1
0.8
1
Delay Time for Presence Detect Recovery (Note 4)
tDLY2
399.2
499
Delay Time for Write 1/Write 0 Recovery
tDLY3
0.8
1
Turn-Off Time for 1-Wire Reset
tOFF1
1.6
2
Turn-Off Time for Write 1/Write 0 (Note 5)
tOFF2
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:
Note 2:
Note 3:
Note 4:
Note 5:
AC electrical characteristics assume 50% duty cycle for the oscillator, oscillator frequency ≤ 75MHz, and are not 100% production
tested, but are guaranteed by design.
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.
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.
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.
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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