DS1921H/Z Maxim Integrated Products, DS1921H/Z Datasheet - Page 29

• Manufacturer Part Number: DS1921H/Z
• Description: High Resolution Thermochron Ibutton Range H
• Manufacturer: Maxim Integrated Products

READ/WRITE TIMING DIAGRAM Figure 14
Write-One Time Slot
Write-Zero Time Slot
Read-Data Time Slot
Slave-to-Master
A read-data time slot is very similar to a write-one time slot. The master begins a read-data time slot with
pulling the data line low. As the voltage on the 1-Wire line falls below the threshold V
starts its internal time base. The master pull-down time (t
the setup time t
DS1921H/Z will hold the data line low for t
data line low at all.
V
V
V
IHMASTER
IHMASTER
IHMASTER
V
V
V
V
V
ILMAX
V
ILMAX
ILMAX
V
V
V
V
V
V
SU
PUP
PUP
PUP
0V
0V
0V
TH
TH
TH
TL
TL
TL
, after which the DS1921H/Z delivers a bit to its 1-Wire port. When transmitting a 0, the
t
F
t
t
F
F
RESISTOR
RESISTOR
RESISTOR
t
RL
t
W1L
t
t
SLSMIN
SLSMIN
e
d
t
W0L
t
Sampling
SPDMIN
Window
Master
SPD
t
MSR
. If the data bit is a 1, the DS1921H/Z will not hold the
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MASTER
MASTER
MASTER
DS1921H/Z
DS1921H/Z
t
Sampling
Sampling
SLSMAX
Window
Window
t
SLSMAX
t
SPDMAX
MPDR
= t
RL
+ t
t
F
SLOT
) must be long enough to cover
t
t
REC
SLOT
t
REC
DS1921H/Z
DS1921H/Z
DS1921H/Z
t
SLOT
t
REC
TL
, the DS1921H/Z