Rainbow-electronics DS28EA00 Manual de usuario descargar pdf (Pagina 27)

DS28EA00 1-Wire Digital Thermometer with Sequence Detect and PIO

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COMMAND-SPECIFIC 1-Wire COMMUNICATION PROTOCOL—LEGEND

SYMBOL DESCRIPTION

RST 1-Wire Reset Pulse generated by master.

PD 1-Wire Presence Pulse generated by slave.

SELECT Command and data to satisfy the ROM function protocol.

SKIPR ROM Function Command "Skip ROM".

CDRR ROM Function Command "Conditional Read ROM".

WSP Command "Write Scratchpad".

RSP Command "Read Scratchpad".

CPSP Command "Copy Scratchpad".

CTEMP Command "Convert Temperature".

RPM Command "Read Power Mode".

RCLE Command "Recall EEPROM".

PIOR Command "PIO Access Read".

PIOW Command "PIO Access Write".

CHAIN Command "Chain".

<n bytes> Transfer of n bytes.

CRC Transfer of a CRC byte

<xxh> Transfer of a specific byte value “xx” (hexadecimal notation)

00 loop Indefinite loop where the master reads 00 bytes.

FF loop Indefinite loop where the master reads FF bytes.

AA loop Indefinite loop where the master reads AA bytes.

xx loop Indefinite loop where the slave transmits the inverted invalid control byte.

CONVERSION

A temperature conversion takes place; activity on the 1-Wire bus is permitted only with

local V

supply.

PROGRAMMING

Data transfer to Backup EEPROM; activity on the 1-Wire bus is permitted only with local

supply.

COMMAND-SPECIFIC 1-Wire COMMUNICATION PROTOCOL—COLOR CODES

Master to slave Slave to master Programming Conversion

WRITE SCRATCHPAD

RST PD Select WSP <3 bytes> RST PD

READ SCRATCHPAD

RST PD Select RSP <8 bytes> CRC FF loop

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Rainbow-electronics DS28EA00 Manual de usuario Pagina 27