DS1621 Datasheet, PDF (11/16 Pages) Dallas Semiconductor – Digital Thermometer and Thermostat

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
INSTRUCTION
Read Temperature
Read Counter
Read Slope
Start Convert T
Stop Convert T
Access TH
Access TL
Access Config
2-WIRE BUS DATA
AFTER ISSUING
DESCRIPTION
PROTOCOL
PROTOCOL
TEMPERATURE CONVERSION COMMANDS
Read last converted temperature
AAh
<read 2 bytes data>
value from temperature register.
Reads value of count remaining
A8h
<read data>
from counter.
Reads value of the slope
A9h
<read data>
accumulator.
Initiates temperature
EEh
idle
conversion.
Halts temperature conversion.
22h
idle
THERMOSTAT COMMANDS
Reads or writes high
A1h
<write data>
temperature limit value into TH
register.
Reads or writes low
A2h
<write data>
temperature limit value into TL
register.
Reads or writes configuration
ACh
<write data>
data to configuration register.
NOTES
1
1
2
2
2
NOTES:
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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