DS28EA00 Datasheet, PDF (27/29 Pages) Dallas Semiconductor – 1-Wire Digital Thermometer with Sequence Detect and PIO

DS28EA00 1-Wire Digital Thermometer with Sequence Detect and PIO
COMMAND-SPECIFIC 1-Wire COMMUNICATION PROTOCOL—LEGEND
SYMBOL
RST
PD
SELECT
SKIPR
CDRR
WSP
RSP
CPSP
CTEMP
RPM
RCLE
PIOR
PIOW
CHAIN
<n bytes>
CRC
<xxh>
00 loop
FF loop
AA loop
xx loop
CONVERSION
PROGRAMMING
DESCRIPTION
1-Wire Reset Pulse generated by master.
1-Wire Presence Pulse generated by slave.
Command and data to satisfy the ROM function protocol.
ROM Function Command "Skip ROM".
ROM Function Command "Conditional Read ROM".
Command "Write Scratchpad".
Command "Read Scratchpad".
Command "Copy Scratchpad".
Command "Convert Temperature".
Command "Read Power Mode".
Command "Recall EEPROM".
Command "PIO Access Read".
Command "PIO Access Write".
Command "Chain".
Transfer of n bytes.
Transfer of a CRC byte
Transfer of a specific byte value “xx” (hexadecimal notation)
Indefinite loop where the master reads 00 bytes.
Indefinite loop where the master reads FF bytes.
Indefinite loop where the master reads AA bytes.
Indefinite loop where the slave transmits the inverted invalid control byte.
A temperature conversion takes place; activity on the 1-Wire bus is permitted only with
local V_DD supply.
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
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