DS7505(2015) 查看數據表（PDF） - Maxim Integrated
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DS7505 Datasheet PDF : 14 Pages
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DS7505
Digital Thermometer and Thermostat
Configuration Register
The configuration register allows the user to program
various DS7505 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 2. The user
has read/write access to all bits in the configuration reg-
ister except the MSB (NVB bit), which is a read-only bit.
All bits in the register but the NVB bit are NV EEPROM
backed by shadow SRAM, and thus power-up in their
programmed state. Once written to the shadow SRAM,
values can be stored in EEPROM by issuance of a Copy
Data command from the master (see the Command Set
section for more details). If the values are not copied
to the EEPROM, the device powers up with the factory
default settings or the last values that were copied to the
EEPROM. The NVB bit is SRAM and powers up in the
state shown in Table 2.
MSB
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
LSB
NVB
R1
R0
F1
F0
POL
TM
SD
Figure 5. Configuration Register
Table 2. Configuration Register Bit Descriptions
BIT NAME
NVB
NV Memory Status
R1
Conversion Resolution Bit 1
R0
Conversion Resolution Bit 0
F1
Thermostat Fault Tolerance Bit 1
F0
Thermostat Fault Tolerance Bit 0
POL
Thermostat Output (O.S.) Polarity
FUNCTIONAL DESCRIPTION
Power-up state = 0, read only
NVB = 1—Write to an NV memory cell is in progress.
NVB = 0—NV memory is not busy.
Factory power-up state = 0
Sets conversion resolution (see Table 3).
Factory power-up state = 0
Sets conversion resolution (see Table 3).
Factory power-up state = 0
Sets the thermostat fault tolerance (see Table 4).
Factory power-up state = 0
Sets the thermostat fault tolerance (see Table 4).
Factory power-up state = 0
POL = 0—O.S. is active low.
POL = 1—O.S. is active high.
TM
Thermostat Operating Mode
Factory power-up state = 0
TM = 0—Comparator mode.
TM = 1—Interrupt mode.
See the Operation—Thermostat section for a detailed description of these modes.
SD
Shutdown
Factory 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.
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