DS1921Z Maxim, DS1921Z Datasheet - Page 31
DS1921Z
Manufacturer Part Number
DS1921Z
Description
The DS1921H/Z Thermochron® iButtons® are rugged, self-sufficient systems that measure temperature and record the result in a protected memory section
Manufacturer
Maxim
Datasheet
1.DS1921H.pdf
(45 pages)
- Current page: 31 of 45
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READ/WRITE TIMING DIAGRAM Figure 15
Write-One Time Slot
Write-Zero Time Slot
Read-Data Time Slot
Slave to Master
A read-data time slot begins like a write-one time slot. The voltage on the data line must remain below
V
DS1921H/Z will start pulling the data line low; its internal timing generator determines when this pull-
down ends and the voltage starts rising again. When responding with a 1, the DS1921H/Z will not hold
the data line low at all, and the voltage starts rising as soon as t
The sum of t
other side define the master sampling window (t
read from the data line. For most reliable communication, t
master should read close to but no later than t
wait until t
for the next time slot.
TL
until the read low time t
V
V
SLOT
IHMASTER
IHMASTER
V
V
RL
V
ILMAX
V
ILMAX
V
V
V
V
PUP
PUP
0V
0V
is expired. This guarantees sufficient recovery time t
TH
TH
+ δ (rise time) on one side and the internal timing generator of the DS1921H/Z on the
TL
TL
t
F
t
F
RESISTOR
RESISTOR
t
W1L
RL
ε
is expired. During the t
t
W0L
MSRMAX
MSRMIN
31 of 45
MASTER
MASTER
t
SLOT
. After reading from the data line, the master must
t
SLOT
to t
RL
MSRMAX
RL
RL
window, when responding with a 0, the
should be as short as permissible and the
is over.
) in which the master must perform a
REC
ε
for the DS1921H/Z to get ready
t
REC
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