DS1920 datasheet(19/22 Pages) DALLAS

tên linh kiện	DS1920

Giải thích chi tiết về linh kiện	Temperature iButton

PDF	22 Pages

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nhà sản xuất	DALLAS [Dallas Semiconductor]

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DS1920

19 of 22

MEMORY FUNCTION EXAMPLE Table 3

Example: Bus Master initiates temperature conversion, then reads temperature.

MASTER MODE

DATA (LSB FIRST)

COMMENTS

Reset

Reset pulse( 480-960

µs)

Presence

Presence pulse

55H

Issue "Match ROM" command

<64-bit ROM code>

Issue address for DS1920

44H

Issue "Convert Temperature" command

Data line is held high for at least 0.5 seconds by bus

master to allow conversion to complete.

Reset

Reset pulse

Presence

Presence pulse

55H

Issue "Match ROM" command

<64-bit ROM code>

Issue address for DS1920

BEH

Issue "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 calculated and

the CRC read. If they match, the master continues; if

not, this read operation is repeated.

Reset

Reset pulse

Presence

Presence pulse, done.

DS1920 bảng dữ liệu(PDF) 19 Page - Dallas Semiconductor