Datasheet
Table 5. Configuration Register Bit Descriptions
Table 6. Resolution Configuration
*Stored in EEPROM
BIT NAME (USER ACCESS) FUNCTIONAL DESCRIPTION
DONE—Temperature Conversion
Done (Read Only)
Power-up state = 1.
DONE = 0. Temperature conversion is in progress.
DONE = 1. Temperature conversion is complete.
THF—Temperature High Flag
(Read/Write)
Power-up state = 0.
THF = 0. The measured temperature has not exceeded the value stored in the T
H
register since power-up.
THF = 1. At some point since power-up the measured temperature has been higher
than the value stored in the T
H
register. THF remains a 1 until it is overwritten with a 0
by the user, the power is cycled, or a Software POR command is issued.
TLF—Temperature Low Flag
(Read/Write)
Power-up state = 0.
TLF = 0. The measured temperature has not been lower than the value stored in the T
L
register since power-up.
TLF = 1. At some point since power-up the measured temperature has been lower than
the value stored in the T
L
register. TLF remains a 1 until it is overwritten with a 0 by the
user, the power is cycled, or a Software POR command is issued.
NVB—NV Memory Busy
(Read Only)
Power-up state = 0.
NVB = 1. A write to EEPROM memory is in progress.
NVB = 0. NV memory is not busy.
R1—Resolution Bit 1 (Read/Write)
Power-up state = 1.
Sets conversion, T
H
, and T
L
resolution (see Table 6).
R0—Resolution Bit 0 (Read/Write)
Power-up state = 1.
Sets conversion, T
H
, and T
L
resolution (see Table 6).
POL*—T
OUT
Polarity (Read/Write)
Power-up state = last value written to this bit. Factory setting = 0.
POL = 1. T
OUT
is active high.
POL = 0. T
OUT
is active low.
1SHOT*—Conversion Mode
(Read/Write)
Power-up state = last value written to this bit. Factory setting = 0.
1SHOT = 1. One-Shot Mode. The Start Convert T command initiates a single
temperature conversion and then the device goes into a low-power standby state.
1SHOT = 0. Continuous Conversion Mode. The Start Convert T command initiates
continuous temperature conversions.
R1 R0 RESOLUTION (BIT) CONVERSION TIME (MAX)
0 0 9 93.75ms
0 1 10 187.5ms
1 0 11 375ms
1 1 12 750ms
DS1631/DS1631A/
DS1731
High-Precision Digital
Thermometer and Thermostat
www.maximintegrated.com
Maxim Integrated
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