Rainbow Electronics DS28EA00 - Manual (Page 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".
Transfer of n bytes.
CRC Transfer of a CRC byte
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
DD
supply.
PROGRAMMING
Data transfer to Backup EEPROM; activity on the 1-Wire bus is permitted only with local
V
DD
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