DS1615 Datasheet, PDF (20/24 Pages) Dallas Semiconductor – Temperature Recorder

DS1615
Note that the Specification test command is ignored if the ST button is pulled to ground when the
command is issued.
4. Read Temperature (55h)
Host Transmit:
D7
0
D6
1
D5
0
D4
1
D3
0
D2
1
D1
0
D0
1
DS1615 Response (Host Receives): When the device is not currently datalogging (i.e., MIP = 0), the
Temperature is immediately measured and value is written to the Current Temperature register.
This command instructs the DS1615 to immediately perform a temperature measurement and to store the
resulting value in the Current Temperature register. The temperature value obtained from this command
is not stored in the datalog or histogram memory. After this command has been executed, the user must
read the Temperature Ready (TR) bit in the Status register to determine if the temperature measurement
has been completed. If the TR bit is a logic 1, the measurement has been completed and the value in the
Current Temperature register is valid. If the TR bit is a logic 0, the measurement has not been completed.
This command functions only when MIP = 0 (i.e., the device is not currently datalogging). If MIP =1, the
DS1615 takes no action in response to the command.
5. Clear Memory (A5h)
Host Transmit:
D7
1
D6
0
D5
1
D4
0
D3
0
D2
1
D1
0
D0
1
DS1615 Response: The contents of the datalog, histogram, Temperature Alarm, Current Samples, Start
Time Stamp, Start Delay, and Sample Rate registers are cleared if the Clear Memory command has been
enabled by setting the CLR bit in the Control register to a one. After clearing the memory, the MEM
CLR bit in the Status register is set. The Clear Memory command functions only if the oscillator is
active. The DS1615 is inaccessible for 500 µs after the Clear Memory command has been issued.
20 of 24