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DS1821
 
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CONFIGURATION REGISTER BIT DESCRIPTIONS Table 3
Bit Name
r A
Functional Description
DONE  Temperature Conversion Done
(Read Only)
DONE = 0  Temperature conversion is in progress.
DONE = 1  Temperature conversion is complete.
NOTE: DONE = 0 at POR.
NVB  Non-volatile Memory Busy
Read Onl  
NVB = 0  Nonvolatile memory is not busy.
NVB = 1  A write to EEPROM memor is in ro ress
THF*  Temperature High Flag
(Read/Write)
THF = 0  The measured temperature has not exceeded the
value stored in the T
H
 register.
THF = 1  At some point in time the measured temperature has
been higher than the value stored in the T
H
 register. THF will
r m in   1  n il i i
r-  ri   n   i h
h
r
TLF*  Temperature Low Flag
(Read/Write)
TLF = 0  The measured temperature has not been lower than
the value stored in the T
L
 register.
TLF = 1  At some point in time the measured temperature has
been lower than the value stored in the T
L
 register. TLF will
r m in   1  n il i i
r-  ri   n   i h
h
r
T/R  ?  Power-up Operating Mode
(Read/Write)
T/R  ?= 0  DS1821 powers up in 1- wire mode.
T/R  ?= 1  DS1821 powers up in thermostat mode.
POL*  Thermostat Output (DQ) Polarity
Read/Write
POL = 0  Thermostat output (DQ) is active low.
POL = 1  Thermostat out ut D    is active hi h.
1SHOT*  Conversion Mode
(Read/Write)
1SHOT = 0  Continuous conversion mode. The Start Convert
T [EEh] command initiates continuous temperature conversions,
which can be stopped with the Stop Convert T [22h] command.
1SHOT = 1  One-shot mode. The Start Convert T [EEh]
command initiates a single temperature conversion after which
h  D  1 21 r   rn
l   -
r    n
*Stored in EEPROM
 
 
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