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DS75
 
9 of 14
CONFIGURATION REGISTER
The configuration register allows the user to program various DS75 options such as conversion
resolution, thermostat fault tolerance, thermostat polarity, thermostat operating mode, and shutdown
mode. The configuration register is arranged as shown in Figure 5 and detailed descriptions of each bit
are provided in Table 4. The user has read/write access to all bits in the configuration register except the
MSb, which is a reserved read-only bit. The entire register is volatile, and thus powersup in its default
state.
 
Figure 5. CONFIGURATION REGISTER  
 
MSb
it 6
it 5
it 4
it 3
it 2
it 1
LSb
0
R1
R0
F1
F0
POL
TM
SD
 
Table 4. CONFIGURATION REGISTER BIT DESCRIPTIONS
BIT NAME
FUNCTIONAL DESCRIPTION
0
Reserved
Power-up state = 0
The master can write to this bit, but it will always read out as a 0.
R1
Conversion Resolution Bit 1
Power-up state = 0
Sets conversion resolution (see Table 5)
R0
Conversion Resolution Bit 0
Power-up state = 0
Sets conversion resolution (see Table 5)
F1
Thermostat Fault Tolerance Bit 1
Power-up state = 0
Sets the thermostat fault tolerance (see Table 6).
F0
Thermostat Fault Tolerance Bit 0
Power-up state = 0
Sets the thermostat fault tolerance (see Table 6).
POL
Thermostat Output (O.S.) Polarity
Power-up state = 0
POL = 0  O.S. is active low.
POL = 1  O.S. is active high.
TM
Thermostat Operating Mode
Power-up state = 0
TM = 0  Comparator mode.
TM = 1  Interrupt mode.
See the OPERATIONThermostat section for a detailed description
of these modes.
SD
Shutdown
Power-up state = 0
SD = 0  Active conversion and thermostat operation.
SD = 1  Shutdown mode.
See the SHUTDOWN MODE section for a detailed description of
this mode.
 
Table 5. RESOLUTION CONFIGURATION 
R1
R0     THERMOMETER
RESOLUTION
MAX CONVERSION
TIME
0
0
9bit
150 ms
0
1
10bit
300 ms
1
0
11bit
600 ms
1
1
12bit
1200 ms
 
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