DS75U+T&R【PDF 8/14 页】IC THERMOMETER/STAT DIG 8-MSOP

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DS75

8 of 14

compared to the values in the T

and T

HYST

registers, and then O.S. is updated based on the result of the

comparison and the operating mode. The number of T

and T

HYST

bits used during the thermostat

comparison is equal to the conversion resolution set by the R1 and R0 bits in the configuration register.

For example, it the resolution is 9 bits, only the 9 MSbs of T

and T

HYST

will be used by the thermostat

comparator.

The active state of the O.S. output can be changed via the POL bit in the configuration register. The

power-up default is active low.

If the user does not wish to use the thermostat capabilities of the DS75, the O.S. output should be left

floating. Note that if the thermostat is not used, the T

and T

HYST

registers can be used for general

storage of system data.

Comparator Mode When the thermostat is in comparator mode, O.S. can be programmed to operate

with any amount of hysteresis. The O.S. output becomes active when the measured temperature exceeds

the T

value a consecutive number of times as defined by the F1 and F0 fault tolerance (FT) bits in the

configuration register. O.S. then stays active until the first time the temperature falls below the value

stored in T

HYST

. Putting the device into shutdown mode does not clear O.S. in comparator mode.

Thermostat comparator mode operation with FT = 2 is illustrated in Figure 4.

Interrupt Mode In interrupt mode, the O.S. output first becomes active when the measured

temperature exceeds the T

value a consecutive number of times equal to the FT value in the

configuration register. Once activated, O.S. can only be cleared by either putting the DS75 into shutdown

mode or by reading from any register (temperature, configuration, T

, or T

HYST

) on the device. Once

O.S. has been deactivated, it will only be reactivated when the measured temperature falls below the

HYST

value a consecutive number of times equal to the FT value. Again, O.S can only be cleared by

putting the device into shutdown mode or reading any register. Thus, this interrupt/clear process is

cyclical between T

and T

HYST

events (i.e, T

, clear, T

HYST

, clear, T

HYST

, clear, etc.).

Thermostat interrupt mode operation with FT = 2 is illustrated in Figure 4.

Figure 4. O.S. OUTPUT OPERATION EXAMPLE

In this example the DS75

is configured to have a

fault tolerance of 2.

O.S. Output - Comparator Mode

Conversions

Inactive

Active

Temperature

HYST

Inactive

Active

O.S. Output - Interrupt Mode

Assumes a read

has occurred

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