DS1820 Ver la hoja de datos (PDF) - Dallas Semiconductor -> Maxim Integrated

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DS1820

1–Wire™ Digital Thermometer

Dallas Semiconductor -> Maxim Integrated 

DS1820

MEMORY FUNCTION EXAMPLE Table 3

Example: Bus Master initiates temperature conversion, then reads temperature (parasite power assumed).

MASTER MODE

TX

RX

TX

TX

TX

TX

TX

RX

TX

TX

TX

RX

TX

RX

DATA (LSB FIRST)

Reset

Presence

55h

<64–bit ROM code>

44h

<I/O LINE HIGH>

Reset

Presence

55h

<64–bit ROM code>

BEh

<9 data bytes>

Reset

Presence

COMMENTS

Reset pulse (480–960 µs).

Presence pulse.

Issue “Match ROM” command.

Issue address for DS1820.

Issue “Convert T” command.

I/O line is held high for at least 500 ms by bus master to

allow conversion to complete.

Reset pulse.

Presence pulse.

Issue “Match ROM” command.

Issue address for DS1820.

Issue “Read Scratchpad” command.

Read entire scratchpad plus CRC; the master now recal-

culates 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 Pulse.

Presence pulse, done.

030598 21/27

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