Datasheet

Related Application Notes
The following application notes can be
applied to the DS18B20 and are available at
www.maximintegrated.com.
Application Note 27: Understanding and Using Cyclic
Redundancy Checks with Maxim iButton Products
Application Note 122: Using Dallas’ 1-Wire ICs in 1-Cell
Li-Ion Battery Packs with Low-Side N-Channel Safety
FETs Master
Application Note 126: 1-Wire Communication Through
Software
Application Note 162: Interfacing the DS18x20/DS1822
1-Wire Temperature Sensor in a Microcontroller
Environment
Application Note 208: Curve Fitting the Error of a
Bandgap-Based Digital Temperature Sensor
Application Note 2420: 1-Wire Communication with a
Microchip PICmicro Microcontroller
Application Note 3754: Single-Wire Serial Bus Carries
Isolated Power and Data
Sample 1-Wire subroutines that can be used in conjunc-
tion with Application Note 74: Reading and Writing iBut-
tons via Serial Interfaces can be downloaded from the
Maxim website.
Figure 17. Detailed Master Read 1 Timing
Figure 18. Recommended Master Read 1 Timing
VIH OF MASTER
MASTER SAMPLES
V
PU
1-Wire BUS
GND
15µs
T
INT
> 1µs T
RC
VIH OF MASTER
LINE TYPE LEGEND
RESISTOR PULLUP
BUS MASTER PULLING LOW
MASTER SAMPLES
15µs
T
INT
=
SMALL
T
RC
=
SMALL
V
PU
1-Wire BUS
GND
DS18B20 Programmable Resolution
1-Wire Digital Thermometer
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