Datasheet

DS2413: 1-Wire Dual Channel Addressable Switch
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Read/Write Time Slots
Data communication with the DS2413 takes place in time slots, which carry a single bit each. Write-time slots
transport data from bus master to slave. Read-time slots transfer data from slave to master. Figure 12 illustrates
the definitions of the write- and read-time slots.
All communication begins with the master pulling the data line low. As the voltage on the 1-Wire line falls below the
threshold V
TL
, the DS2413 starts its internal timing generator that determines when the data line is sampled during
a write-time slot and how long data is valid during a read-time slot.
Figure 12. Read/Write Timing Diagram
Write-One Time Slot
RESISTOR MASTER
V
PUP
V
IHMASTER
V
TH
V
TL
V
ILMAX
0V
t
F
t
SLOT
t
W1L

Write-Zero Time Slot
RESISTOR MASTER
t
REC
V
PUP
V
IHMASTER
V
TH
V
TL
V
ILMA
X
0V
t
F
t
SLOT
t
W0L

Read-Data Time Slot
RESISTOR MASTER DS2413
t
REC
V
PUP
V
IHMASTER
V
TH
V
TL
V
ILMAX
0V
Master
Sampling
Window

t
F
t
SLOT
t
RL
t
MSR