DS7505U+T&R【PDF 7/14 页】IC DGTL THERMOMETER 2WIRE 8-USOP

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Digital Thermometer and Thermostat

_______________________________________________________________________________________ 7

IN THIS EXAMPLE, THE DS7505 IS CONFIGURED

TO HAVE A FAULT TOLERANCE OF 2.

HYST

TEMPERATURE

O.S. OUTPUTCOMPARATOR MODE

O.S. OUTPUTINTERRUPT MODE

INACTIVE

ACTIVE

CONVERSIONS

ASSUMES A READ

HAS OCCURED

Figure 4. O.S. Output Operation Example

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 DS7505 into

shutdown mode or by reading from any register (tem-

perature, configuration, T

, or T

HYST

) on the device.

Once O.S. has been deactivated, it is only reactivated

when the measured temperature falls below the T

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

and T

HYST

events (i.e, T

, clear, T

HYST

, clear,

, clear, T

HYST

, clear, etc.). Thermostat interrupt

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

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