DS1631 Datasheet, PDF (10/15 Pages) National Semiconductor (TI) – CMOS Dual Peripheral Drivers

DS1631/DS1631A/DS1731
Table 5. CONFIGURATION REGISTER BIT DESCRIPTIONS
BIT NAME
(USER ACCESS)
FUNCTIONAL DESCRIPTION
DONE—Temperature
Power-up state = 1.
Conversion Done
DONE = 0. Temperature conversion is in progress.
(Read Only)
DONE = 1. Temperature conversion is complete.
Power-up state = 0.
THF = 0. The measured temperature has not exceeded the value
THF—Temperature High Flag
(Read/Write)
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.
Power-up state = 0.
TLF = 0. The measured temperature has not been lower than the
TLF—Temperature Low Flag
(Read/Write)
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
Power-up state = 1.
(Read/Write)
R0—Resolution Bit 0
Sets conversion, T_H, and T_L resolution (see Table 6).
Power-up state = 1.
(Read/Write)
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.
Power-up state = last value written to this bit. Factory setting = 0.
1SHOT = 1. One-Shot Mode. The Start Convert T command initiates
1SHOT*—Conversion Mode a single temperature conversion and then the device goes into a low-
(Read/Write)
power standby state.
1SHOT = 0. Continuous Conversion Mode. The Start Convert T
command initiates continuous temperature conversions.
*Stored in EEPROM
Table 6. RESOLUTION CONFIGURATION
R1
R0
RESOLUTION CONVERSION TIME
(BIT)
(MAX)
0
0
9
93.75ms
0
1
10
187.5ms
1
0
11
375ms
1
1
12
750ms
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