Datasheet

PIN
NAME FUNCTION
TO-92
SO
1
5 GND Ground
2
4 DQ
Data Input/Output. Open-drain 1-Wire interface pin. Also provides power to the
device when used in parasite power mode (see the Powering the DS18S20 section.)
3
3 V
DD
Optional V
DD
. V
DD
must be grounded for operation in parasite power mode.
—
1, 2, 6, 7, 8 N.C. No Connection
Figure 2. Timing Diagrams
START OF NEXT CYCLE
1-Wire
WRITE ZERO TIME SLOT
t
REC
t
SLOT
t
LOW0
1-Wire READ ZERO TIME SLOT
t
REC
t
SLOT
START OF NEXT CYCLE
t
RDV
1-Wire RESET PULSE
1-Wire PRESENCE DETECT
t
RSTL
t
RSTH
t
PDHIGH
PRESENCE DETECT
t
PDLOW
RESET PULSE FROM HOST
DS18S20 High-Precision 1-Wire Digital Thermometer
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Pin Description