18B20 datasheet(23/27 Pages) DALLAS

Part #	18B20

Description	Programmable Resolution 1-Wire Digital Thermometer

PDF	27 Pages

Scroll/Zoom	100%

Manufacturer	DALLAS [Dallas Semiconductor]

Direct Link	https://www.maximintegrated.com/en.html

Logo

23 / 27 page

DS18B20

23 of 27

MEMORY FUNCTION EXAMPLE Table 6

Example: Bus Master writes memory (parasite power and only one DS18B20 assumed).

MASTER MODE

DATA (LSB FIRST)

COMMENTS

Reset

Reset pulse.

Presence

Presence pulse.

CCh

Skip ROM command.

4Eh

Write Scratchpad command.

<3 data bytes>

Writes three bytes to scratchpad (TH, TL, and config).

Reset

Reset pulse.

Presence

Presence pulse.

CCh

Skip ROM command.

BEh

Read Scratchpad command.

<9 data bytes>

Read entire scratchpad plus CRC. The master now

recalculates the CRC of the eight data bytes received

from the scratchpad, compares the CRC and the two

other bytes read back from the scratchpad. If data match,

the master continues; if not, repeat the sequence.

Reset

Reset pulse.

Presence

Presence pulse.

CCh

Skip ROM command.

48h

Copy Scratchpad command; after issuing this command,

the master must wait 10 ms for copy operation to

complete.

Reset

Reset pulse.

Presence

Presence pulse, done.

18B20 Datasheet(PDF) 23 Page - Dallas Semiconductor

18B20 Datasheet(HTML) 23 Page - Dallas Semiconductor

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27

Datasheet Download

Link URL