DS1621
measurement will be completed and the DS1621 will remain idle until a Start Convert T is issued to
resume continuous operation.
DS1621 COMMAND SET Table 3
2-WIRE BUS DATA
AFTER ISSUING
INSTRUCTION
DESCRIPTION
PROTOCOL
PROTOCOL
NOTES
TEMPERATURE CONVERSION COMMANDS
Read Temperature Read last converted temperature
value from temperature register.
AAh
A8h
A9h
EEh
22h
<read 2 bytes data>
<read data>
<read data>
idle
Read Counter
Reads value of count remaining
from counter.
Read Slope
Reads value of the slope
accumulator.
Start Convert T
Stop Convert T
Access TH
Initiates temperature
conversion.
Halts temperature conversion.
THERMOSTAT COMMANDS
Reads or writes high
1
1
2
idle
A1h
A2h
ACh
<write data>
temperature limit value into TH
register.
Access TL
Reads or writes low
<write data>
<write data>
2
2
temperature limit value into TL
register.
Access Config
NOTES:
Reads or writes configuration
data to configuration register.
1. In continuous conversion mode a Stop Convert T command will halt continuous conversion. To
restart the Start Convert T command must be issued. In one–shot mode a Start Convert T command
must be issued for every temperature reading desired.
2. Writing to the E2 typically requires 10ms at room temperature. After issuing a write command, no
further writes should be requested for at least 10 ms.
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DALLAS [ DALLAS SEMICONDUCTOR ]
