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

—

1, 2, 6, 7, 8

N.C.

No Connection

Figure 2. Timing Diagrams

START OF NEXT CYCLE

1-Wire WRITE ZERO TIME SLOT

1-Wire READ ZERO TIME SLOT

START OF NEXT CYCLE

1-Wire RESET PULSE

1-Wire PRESENCE DETECT

PRESENCE DETECT

RESET PULSE FROM HOST

DS18S20

High-Precision 1-Wire Digital Thermometer

www.maximintegrated.com

Maxim Integrated │ 4

Pin Description