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DS1821 датащи(PDF) 13 Page - Maxim Integrated Products

номер детали DS1821
подробное описание детали  Programmable Digital Thermostat and Thermometer
PDF  19 Pages
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производитель  MAXIM [Maxim Integrated Products]
домашняя страница  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

DS1821 датащи(HTML) 13 Page - Maxim Integrated Products

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Figure 9 illustrates that the sum of TINIT, TRC, and TSAMPLE must be less than 15 µs for a read time slot.
Figure 10 shows that system timing margin is maximized by keeping TINIT and TRC as short as possible
and by locating the master sample time during read time slots towards the end of the 15 µs period.
READ/WRITE TIME SLOT TIMING DIAGRAM Figure 8
DETAILED MASTER READ 1 TIMING Figure 9
RECOMMENDED MASTER READ 1 TIMING Figure 10
VDD
GND
1-WIRE BUS
15 µs
VIH of Master
TRC
TINT > 1 µs
Master samples
VDD
GND
1-WIRE BUS
15 µs
VIH of Master
TRC =
small
TINT =
small
Master samples
LINE TYPE LEGEND (Figure 8, Figure 9 and Figure 10)
Bus master pulling low
DS1821 pulling low
Resistor pullup
45 µs
15 µs
VDD
GND
1-WIRE BUS
60 µs < TX “0” < 120
1 µs < TREC < ∞
DS1821 samples
MIN
TYP
MAX
15 µs
30 µs
> 1 µs
MASTER WRITE “0” SLOT
MASTER WRITE “1” SLOT
DS1821 samples
MIN
TYP
MAX
VDD
GND
1-WIRE BUS
15 µs
MASTER READ “0” SLOT
MASTER READ “1” SLOT
Master samples
Master samples
START
OF SLOT
START
OF SLOT
> 1 µs
1 µs < TREC < ∞
15 µs
15 µs
30 µs
15 µs
> 1 µs



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