DS1621
DS1621 COMMAND SET
Table 3
2–WIRE BUS DATA
AFTER ISSUING
PROTOCOL
<read 2 bytes data>
<read data>
<read data>
idle
idle
<write data>
<write data>
<write data>
1
1
2
2
2
INSTRUCTION
Read
Temperature
Read Counter
Read Slope
Start Convert T
Stop Convert T
Access TH
Access TL
Access Config
DESCRIPTION
Read last converted temperature value from
temperature register.
Reads value of count remaining from counter.
Reads value of the slope accumulator.
Initiates temperature conversion.
Halts temperature conversion.
Reads or writes high temperature limit value
into TH register.
Reads or writes low temperature limit value
into TL register.
Reads or writes configuration data to configu-
ration register.
PROTOCOL
AAh
A8h
A9h
EEh
22h
A1h
A2h
ACh
NOTES
TEMPERATURE CONVERSION COMMANDS
THERMOSTAT COMMANDS
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 E
2
typically requires 10ms at room temperature. After issuing a write command, no further writes
should be requested for at least 10 ms.
021497 9/14
ETC [ ETC ]
