Datasheet

Figure 2. Timing Diagrams
PIN
NAME FUNCTION
SO µSOP TO-92
1, 2, 6,
7, 8
2, 3, 5,
6, 7
— N.C. No Connection
3 8 3 V
DD
Optional V
DD
. V
DD
must be grounded for operation in parasite power mode.
4 1 2 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 DS18B20 section.)
5 4 1 GND Ground
Pin Description
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
PDIH
PRESENCE DETECT
t
PDLOW
RESET PULSE FROM HOST
DS18B20 Programmable Resolution
1-Wire Digital Thermometer
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